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Dominique Adriaens - One of the best experts on this subject based on the ideXlab platform.
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Descriptive osteology of Corydoras aeneus (Siluriformes: Callichthyidae) by
2015Co-Authors: Frank Huysentruyt, Dominique AdriaensAbstract:study of five adult specimens. The results were compared to the condition described for other loricarioid fishes. Most results corresponded with the expected pattern based on studies dealing with parts of the callichthyid osteology, although some differences were observed. One of these differences was the presence of a suprapreopercular bone, a bone that was previously unmentioned in any callichthyid species. Further, several homologies were resolved and mainly confirmed existing hypotheses. This way, for example, based on the presence of several branches of the lateral line system, the com-pound dorsolateral bone of the otic region was identified as the posttemporo-pterotico-supracleithrum. Further, the pres-ence of several otoliths in the compound bone forming the neurocranial floor in the occipital region, confirmed the fact that the bone comprised out of a fusion of both basi- and exoccipital bones. This study, however failed to resolve some other questions regarding homologies (i.e., lacrymo-antorbital, suprapreopercle) pointing out the need for further ontogenetic research. In this light, this study provides the basis for this further comparative and ontogenetic research on callichthyids specifically and on loricarioids in general. RÉSUMÉ.- Étude de l’ostéologie de Corydoras aeneus (Siluriformes: Callichthyidae). L’ostéologie crâniale et postcrâniale de C o rydoras aeneus (Gill, 1858) est décrite d’après cinq spécimens adultes. Les résultats sont comparés avec ceux des autres poissons loricarioïdes. La plupart sont en accord avec les données de la littéra-ture, qui s’intéressaient surtout à l’ostéologie des Callichthyidae. Néanmoins, quelques différences ont été observées comme la présence d’un suprapréoperculaire, jamais observé chez aucune espèce de Callichthyidae. La majorité des homo-logies ont été résolues, confirmant principalement les hypothèses actuelles. L’os composé situé dorsolatéralement dans l
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development of the osteocranium in corydoras aeneus gill 1858 Callichthyidae siluriformes
Journal of Morphology, 2011Co-Authors: Frank Huysentruyt, Marleen Brunain, Tom Geerinckx, Dominique AdriaensAbstract:Development in the osteocranium of Cory- doras aeneus was studied based on 48 cleared and stained specimens and 10 series of serial sections. Development overall follows the general trends observed in siluriform development, with ossifications appearing as a response to functional demands. Early development of the skull occurs in two distinct phases. In a first phase, several new bony elements, all of dermal origin and related to feeding, appear shortly after yolk depletion (4.4 mm SL). Between 5 and 8 mm SL, developmental priorities seem to shift to size increase of the cartilaginous skull and no new bony elements appear. Finally, a second phase of osteogenesis occurs from 8 to 18 mm SL, in which all remaining dermal and perichondral bones appear. J. Morphol. 272:573-582, 2011. 2011 Wiley-Liss, Inc.
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ontogeny of the cranial musculature in corydoras aeneus Callichthyidae siluriformes
Journal of Fish Biology, 2009Co-Authors: Frank Huysentruyt, Marleen Brunain, Dominique AdriaensAbstract:A complete study of the early ontogeny of the cranial muscles of Corydoras aeneus (Callichthyidae) was undertaken and results were compared with those for the loricariid Ancistrus cf. triradiatus. This comparison reveals a high degree of similarity in the ontogeny of both species' cranial muscles. Both species lack a musculus protractor hyoidei, and the musculus intermandibularis posterior is divided into two different parts that have partly obtained a novel function (serving the lower lip) in A. cf. triradiatus. A similar increase in muscular complexity in this species is found in the dorsal constrictor of the hyoid muscle plate. This constrictor gives rise to the same muscles in both C. aeneus and A. cf. triradiatus, but in A. cf. triradiatus the musculus levator operculi later hypertrophies. In C. aeneus the musculus extensor tentaculi forms a single muscle diverging posteriorly, whereas in A. cf. triradiatus the musculus extensor tentaculi differentiates into two separate bundles. Also, a loricariid neoformation is present called the musculus levator tentaculi.
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ontogeny of the jaw and maxillary barbel musculature in the armoured catfish families loricariidae and Callichthyidae loricarioidea siluriformes with a discussion on muscle homologies
Zoological Journal of the Linnean Society, 2009Co-Authors: Tom Geerinckx, Frank Huysentruyt, Dominique AdriaensAbstract:The neotropical loricarioid catfishes include six families, the most species-rich of which are the Callichthyidae and the Loricariidae. Loricariidae (suckermouth armoured catfishes) have a highly specialized head morphology, including an exceptionally large number of muscles derived from the adductor mandibulae complex and the adductor arcus palatini. Terminology of these muscles varies among the literature, and no data exist on their ontogenetic origin. A detailed examination of the ontogeny of both a callichthyid and a loricariid representative now reveals the identity of the jaw and maxillary barbel musculature, and supports new hypotheses concerning homologies. The adductor mandibulae muscle itself is homologous to the A1-OST and A3′ of basal catfishes, and the A3′ has given rise to the newly evolved loricariid retractor veli as well. The A2 and A3″ have resulted in the retractor tentaculi of Callichthyidae and the retractor premaxillae of Loricariidae. Thus, these two muscles are shown to be homologous. In Loricariidae, the extensor tentaculi consists of two separate muscles inserting on the autopalatine, and evidence is given on the evolutionary origin of the loricariid levator tentaculi (previously and erroneously known as retractor tentaculi) from the extensor tentaculi, and not the adductor mandibulae complex. © 2009 The Linnean Society of London, Zoological Journal of the Linnean Society, 2009, 155, 76‐96. ADDITIONAL KEYWORDS: adductor mandibulae ‐ Ancistrus ‐ Corydoras ‐ development ‐ homology ‐ myology ‐ suckermouth catfish.
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Ontogeny of the chondrocranium in Corydoras aeneus (Gill, 1858) (Callichthyidae, Siluriformes).
Journal of morphology, 2008Co-Authors: Frank Huysentruyt, Marleen Brunain, Dominique AdriaensAbstract:Callichthyids take a basal position in the loricarioid evolutionary lineage leading up to an algae scraping feeding mechanism in the loricariid family. Therefore, the study of the morphology and development of a callichthyid representative would contribute to a better knowledge on the differences in cranial morphology and their impact on feeding ecology within this superfamily. Therefore, development in the chondrocranium of Corydoras aeneus was studied based on 22 cleared and stained specimens and 6 series of serial sections. The latter sections were also digitized and used for 3D reconstructions. Development overall follows the typical siluriform trends in chondrocranial development. Even the low complexity of the chondrocranium at hatching fits the trend observed in other siluriforms, although other studies showed loricarioid hatchlings to generally show more complex chondrocrania. In contrast to other catfish, in C. aeneus, the notochord was never found to protrude into the hypophyseal fenestra. In addition, also differing from other siluriforms, a commissura lateralis is present, a state also reported for Ancistrus cf. triradiatus (Geerinckx et al., [2005] J Morphol 266:331–355). The splanchnocranium again has the typical siluriform shape during its ontogeny, with the presence of a compound hyosymplectic-pterygoquadrate plate, although not fused to the neurocranium or interhyal at any time during ontogeny, a state described earlier for Callichthys callichthys (Hoedeman, [1960a] Bull Aquat Biol 1:73–84; Howes and Teugels, [1989] J Zool Lond 219:441–456). The most striking difference found in comparison to other catfishes, however, involves thebranchial basket, which arises as a single element with a further differentiation from the middle arches on in both a rostral and caudal direction. J. Morphol., 2008. © 2007 Wiley-Liss, Inc.
Frank Huysentruyt - One of the best experts on this subject based on the ideXlab platform.
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Descriptive osteology of Corydoras aeneus (Siluriformes: Callichthyidae) by
2015Co-Authors: Frank Huysentruyt, Dominique AdriaensAbstract:study of five adult specimens. The results were compared to the condition described for other loricarioid fishes. Most results corresponded with the expected pattern based on studies dealing with parts of the callichthyid osteology, although some differences were observed. One of these differences was the presence of a suprapreopercular bone, a bone that was previously unmentioned in any callichthyid species. Further, several homologies were resolved and mainly confirmed existing hypotheses. This way, for example, based on the presence of several branches of the lateral line system, the com-pound dorsolateral bone of the otic region was identified as the posttemporo-pterotico-supracleithrum. Further, the pres-ence of several otoliths in the compound bone forming the neurocranial floor in the occipital region, confirmed the fact that the bone comprised out of a fusion of both basi- and exoccipital bones. This study, however failed to resolve some other questions regarding homologies (i.e., lacrymo-antorbital, suprapreopercle) pointing out the need for further ontogenetic research. In this light, this study provides the basis for this further comparative and ontogenetic research on callichthyids specifically and on loricarioids in general. RÉSUMÉ.- Étude de l’ostéologie de Corydoras aeneus (Siluriformes: Callichthyidae). L’ostéologie crâniale et postcrâniale de C o rydoras aeneus (Gill, 1858) est décrite d’après cinq spécimens adultes. Les résultats sont comparés avec ceux des autres poissons loricarioïdes. La plupart sont en accord avec les données de la littéra-ture, qui s’intéressaient surtout à l’ostéologie des Callichthyidae. Néanmoins, quelques différences ont été observées comme la présence d’un suprapréoperculaire, jamais observé chez aucune espèce de Callichthyidae. La majorité des homo-logies ont été résolues, confirmant principalement les hypothèses actuelles. L’os composé situé dorsolatéralement dans l
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development of the osteocranium in corydoras aeneus gill 1858 Callichthyidae siluriformes
Journal of Morphology, 2011Co-Authors: Frank Huysentruyt, Marleen Brunain, Tom Geerinckx, Dominique AdriaensAbstract:Development in the osteocranium of Cory- doras aeneus was studied based on 48 cleared and stained specimens and 10 series of serial sections. Development overall follows the general trends observed in siluriform development, with ossifications appearing as a response to functional demands. Early development of the skull occurs in two distinct phases. In a first phase, several new bony elements, all of dermal origin and related to feeding, appear shortly after yolk depletion (4.4 mm SL). Between 5 and 8 mm SL, developmental priorities seem to shift to size increase of the cartilaginous skull and no new bony elements appear. Finally, a second phase of osteogenesis occurs from 8 to 18 mm SL, in which all remaining dermal and perichondral bones appear. J. Morphol. 272:573-582, 2011. 2011 Wiley-Liss, Inc.
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ontogeny of the cranial musculature in corydoras aeneus Callichthyidae siluriformes
Journal of Fish Biology, 2009Co-Authors: Frank Huysentruyt, Marleen Brunain, Dominique AdriaensAbstract:A complete study of the early ontogeny of the cranial muscles of Corydoras aeneus (Callichthyidae) was undertaken and results were compared with those for the loricariid Ancistrus cf. triradiatus. This comparison reveals a high degree of similarity in the ontogeny of both species' cranial muscles. Both species lack a musculus protractor hyoidei, and the musculus intermandibularis posterior is divided into two different parts that have partly obtained a novel function (serving the lower lip) in A. cf. triradiatus. A similar increase in muscular complexity in this species is found in the dorsal constrictor of the hyoid muscle plate. This constrictor gives rise to the same muscles in both C. aeneus and A. cf. triradiatus, but in A. cf. triradiatus the musculus levator operculi later hypertrophies. In C. aeneus the musculus extensor tentaculi forms a single muscle diverging posteriorly, whereas in A. cf. triradiatus the musculus extensor tentaculi differentiates into two separate bundles. Also, a loricariid neoformation is present called the musculus levator tentaculi.
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ontogeny of the jaw and maxillary barbel musculature in the armoured catfish families loricariidae and Callichthyidae loricarioidea siluriformes with a discussion on muscle homologies
Zoological Journal of the Linnean Society, 2009Co-Authors: Tom Geerinckx, Frank Huysentruyt, Dominique AdriaensAbstract:The neotropical loricarioid catfishes include six families, the most species-rich of which are the Callichthyidae and the Loricariidae. Loricariidae (suckermouth armoured catfishes) have a highly specialized head morphology, including an exceptionally large number of muscles derived from the adductor mandibulae complex and the adductor arcus palatini. Terminology of these muscles varies among the literature, and no data exist on their ontogenetic origin. A detailed examination of the ontogeny of both a callichthyid and a loricariid representative now reveals the identity of the jaw and maxillary barbel musculature, and supports new hypotheses concerning homologies. The adductor mandibulae muscle itself is homologous to the A1-OST and A3′ of basal catfishes, and the A3′ has given rise to the newly evolved loricariid retractor veli as well. The A2 and A3″ have resulted in the retractor tentaculi of Callichthyidae and the retractor premaxillae of Loricariidae. Thus, these two muscles are shown to be homologous. In Loricariidae, the extensor tentaculi consists of two separate muscles inserting on the autopalatine, and evidence is given on the evolutionary origin of the loricariid levator tentaculi (previously and erroneously known as retractor tentaculi) from the extensor tentaculi, and not the adductor mandibulae complex. © 2009 The Linnean Society of London, Zoological Journal of the Linnean Society, 2009, 155, 76‐96. ADDITIONAL KEYWORDS: adductor mandibulae ‐ Ancistrus ‐ Corydoras ‐ development ‐ homology ‐ myology ‐ suckermouth catfish.
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Ontogeny of the chondrocranium in Corydoras aeneus (Gill, 1858) (Callichthyidae, Siluriformes).
Journal of morphology, 2008Co-Authors: Frank Huysentruyt, Marleen Brunain, Dominique AdriaensAbstract:Callichthyids take a basal position in the loricarioid evolutionary lineage leading up to an algae scraping feeding mechanism in the loricariid family. Therefore, the study of the morphology and development of a callichthyid representative would contribute to a better knowledge on the differences in cranial morphology and their impact on feeding ecology within this superfamily. Therefore, development in the chondrocranium of Corydoras aeneus was studied based on 22 cleared and stained specimens and 6 series of serial sections. The latter sections were also digitized and used for 3D reconstructions. Development overall follows the typical siluriform trends in chondrocranial development. Even the low complexity of the chondrocranium at hatching fits the trend observed in other siluriforms, although other studies showed loricarioid hatchlings to generally show more complex chondrocrania. In contrast to other catfish, in C. aeneus, the notochord was never found to protrude into the hypophyseal fenestra. In addition, also differing from other siluriforms, a commissura lateralis is present, a state also reported for Ancistrus cf. triradiatus (Geerinckx et al., [2005] J Morphol 266:331–355). The splanchnocranium again has the typical siluriform shape during its ontogeny, with the presence of a compound hyosymplectic-pterygoquadrate plate, although not fused to the neurocranium or interhyal at any time during ontogeny, a state described earlier for Callichthys callichthys (Hoedeman, [1960a] Bull Aquat Biol 1:73–84; Howes and Teugels, [1989] J Zool Lond 219:441–456). The most striking difference found in comparison to other catfishes, however, involves thebranchial basket, which arises as a single element with a further differentiation from the middle arches on in both a rostral and caudal direction. J. Morphol., 2008. © 2007 Wiley-Liss, Inc.
Edson A Adriano - One of the best experts on this subject based on the ideXlab platform.
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morphology and small subunit rdna based phylogeny of a new henneguya species infecting the ornamental fish corydoras leucomelas from the peruvian amazon
Acta Tropica, 2017Co-Authors: Patrick D Mathews, Edson A Adriano, Juliana NaldoniAbstract:A new species of Myxosporea, Henneguya loreotoensis n. sp. is described parasitizing the gill filaments from 17 of 35 specimens (48.5%) of Corydoras leucomelas (Siluriformes: Callichthyidae) caught in the Nanay River, near village Ninarumi, in the Loreto state, Peru. Mature spores were ellipsoidal in shape from the frontal view, measuring 36.2±0.1μm (36.1-36.3) in total length, 14.3±0.1μm (14.2-14.4) in body length, 5.1±0.1μm (4.9-5.3) in width and 21.9±0.1μm (21.8-22.0) in the caudal process. The two polar capsules were symmetrical and elongated, measuring 5.1±0.1μm (4.9-5.3) in length and 2.4±0.2μm (2.1-2.7) in width, containing a polar filament with five coils arranged obliquely to the longitudinal axis. The sporoplasm was binucleate. Partial sequencing of the ssu-rDNA of H. loretoensis n. sp. resulted in a total of 1676 nucleotides, and this sequence did not match any of the myxozoan available in the GenBank. The phylogenetic analysis shows H. loretoensis n. sp. as a sister species of Henneguya paraensis, another amazonian myxozoan parasite of Cichla temensis (Perciformes: Cichlidae).
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morphological and ultrastructural aspects of myxobolus niger n sp myxozoa gill parasite of corydoras melini siluriformes Callichthyidae from brazilian amazon
Acta Tropica, 2016Co-Authors: Patrick D Mathews, Antonio Augusto Mendes Maia, Edson A AdrianoAbstract:Myxobolus niger n. sp. (Myxozoa) is described in the connective tissue of the serosa layer of the gill arch of Corydoras melini (Callichthyidae) captured from the Negro River, Amazonas State, Brazil. The prevalence of the parasite was 20% and the range intensity was 1-2 cysts per fish. The plasmodia were white and spherical to ellipsoidal, measuring 175 μm in diameter and were surrounded by a well-defined capsule of host connective tissue, with distinct delicate and interlaced collagen fibers. The myxospores body was ellipsoidal in frontal view and biconvex in sutural view. Spore dimensions were 11.3 ± 0.4 μm in length, 6.8 ± 0.2 μm in width and 4.1 ± 0.2 μm in thickness. The valves were symmetrical and smooth. The two polar capsules were elongated as pyriform and equal in size, measure 5.0 ± 0.3 μm in length and 2.0 ± 0.1 μm in width. The polar capsule had six to seven polar filament turns. Some aberrant spores were round in shape and had three polar capsules. The sporoplasm was binucleated and contained moderated number of sporoplasmosomes. The development of the plasmodia was asynchronic, with mature and immature spores. The plasmodium had moderated pynocitic channels. There were no projections, no invaginations and no microvilli in the plasmodial wall. This study is the first description of Myxobolus species in the fish of the Callichthyidae family.
Claudio Oliveira - One of the best experts on this subject based on the ideXlab platform.
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variation in male reproductive system characters in corydoradinae loricarioidei Callichthyidae reflects the occurrence of different lineages in this subfamily
Neotropical Ichthyology, 2017Co-Authors: Maria Angelica Spadella, Simone P Desan, Teresa C B P O Henriques, Claudio OliveiraAbstract:A familia Callichthyidae compreende um grupo monofiletico bem corroborado, dividida em duas subfamilias: Corydoradinae e Callichthyinae. Uma proposta recente, baseada em dados moleculares, sugeriu que a subfamilia Corydoradinae e composta por nove linhagens, possivelmente generos. As especies pertencentes a cada uma destas linhagens possuem extensivas modificacoes no tamanho do genoma, incluindo especies diploides, tetraploides e octaploides. Considerando a ocorrencia dessas diferentes linhagens e que as extremas variacoes em conteudo de DNA podem implicar em alteracoes significativas na estrutura dos espermatozoides, o presente estudo analisou a morfologia do sistema reprodutor masculino e a morfometria da cabeca dos espermatozoides de representantes das nove linhagens de Corydoradinae, procurando caracteristicas particulares em cada uma. Os dados morfologicos revelaram a ocorrencia de grande variacao dentro das linhagens, maior que aquela observada entre especies de diferentes linhagens. Diferentemente, os dados morfometricos obtidos para oito das nove linhagens revelaram grande congruencia com a atual proposta para Corydoradinae. Estes resultados demonstram que ha correlacao entre as variacoes em conteudo de DNA e o tamanho da cabeca dos espermatozoides, fornecendo, assim, subsidio adicional para a definicao das nove linhagens de Corydoradinae.
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Variation in male reproductive system characters in Corydoradinae (Loricarioidei: Callichthyidae) reflects the occurrence of different lineages in this subfamily
Sociedade Brasileira de Ictiologia, 2017Co-Authors: Maria Angelica Spadella, Simone P Desan, Teresa C B P O Henriques, Claudio OliveiraAbstract:ABSTRACT Callichthyidae comprises a well-corroborated monophyletic group divided into two subfamilies: Corydoradinae and Callichthyinae. A recent proposal, based on molecular data, suggests that Corydoradinae is composed by nine monophyletic lineages, possibly genera. The species pertaining to those lineages have extensive modification in the size of genome, including diploid, tetraploid and octoploid species. Considering the occurrence of these monophyletic lineages and that the variations in DNA content may imply in significant alterations on the structure of spermatozoa, this study analyzed the morphology of the male reproductive system and the morphometry of the head of the spermatozoa of representatives of the nine lineages of Corydoradinae, seeking for particular characteristics of each lineage. Morphological data revealed a high intra-lineage variation, larger than that observed among species of different lineages. In contrast, morphometric data obtained for eight out of the nine lineages, revealed large congruency with the hypothesis that Corydoradinae is composed by different lineages. These results demonstrate that there is a correlation among variations in DNA content and the size of the spermatozoon head, thus providing additional subsides for the definition of the Corydoradinae lineages
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Comparative cytogenetic studies in species of the subfamily Cal- lichthyinae (Teleostei: Siluriformes: Callichthyidae)
2014Co-Authors: Shimabukuro-dias Cristiane Kioko, Claudio Oliveira, Fausto ForestiAbstract:Abstract — In the present study, the karyotype of three species (nine populations) of the Callichthyinae subfamily were investigated with the objective of better understanding the pattern of relationship among the genera that com-pose the subfamily. Among the four populations of Callichthys callichthys studied, two showed 2n=56 chromosomes and two 2n=58 chromosomes. Up to eight additional microchromosomes were observed in the sample from Marı́lia. The three populations of Hoplosternum littorale displayed the same number of chromosomes, 2n=60, and karyotypic constitution, 6M+2SM+52A. The two populations of Megalechis personata showed 2n=62 chromosomes and similar karyotypic formulae, 8M+54A and 6M+2SM+54A. Terminal Ag-NORs were found in one chromosome pair of C. callichthys, H. littorale, and M. personata from Itiquira, and in two pairs in M. personata from Rio Branco. The popu-lations of C. callichthys showed C-band positive segments in centromeric and pericentromeric position and the popu-lations of H. littorale and M. personata exhibited C-band positive segments in centromeric and/or interstitial posi-tion. Contrarily to the extensive chromosome rearrangements verified in the Corydoradinae subfamily, in the Calli-chthyinae subfamily a small number of changes seems to have occurred in its karyotypic evolution
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Time-calibrated phylogeny for Hypoptopomatinae, Neoplecostominae and Otothyrinae.
2014Co-Authors: Fábio F. Roxo, Fausto Foresti, James S. Albert, Gabriel S. C. Silva, Cláudio H. Zawadzki, Claudio OliveiraAbstract:Tree topology from BEAST analysis of 155 specimens representing 113 loricariid species. Divergence ages calibrated by origins of Siluriformes (120 Mya) and Callichthyidae (55 Mya). Regions: A, Atlantic Coastal Drainages (Green); B, Upper Paraná Basin (Red); C, Paraguay, Lower Paraná and Uruguay Basins (Purple); D, Amazon and Orinoco Basins (Blue); E, São Francisco Basin and Northeastern Drainages (Yellow).
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historical biogeography and cryptic diversity in the callichthyinae siluriformes Callichthyidae
Journal of Zoological Systematics and Evolutionary Research, 2013Co-Authors: Tatiane C Mariguela, Fausto Foresti, Markos A Alexandrou, Claudio OliveiraAbstract:The family Callichthyidae, divided into the subfamilies Corydoradinae and Callichthyinae, contains more than 200 species of armoured catfishes distributed throughout the Neotropics, as well as fossil species dating from the Palaeocene. Both subfamilies are very widely distributed throughout the continent, with some species ranges extending across multiple hypothesized biogeographical barriers. Species with such vast geographical ranges could be made up of multiple cryptic populations that are genetically distinct and have diverged over time. Although relationships among Callichthyinae genera have been thoroughly investigated, the historical biogeography of the Callichthyinae and the presence of species complexes have yet to be examined. Furthermore, there is a lack of fossil-calibrated molecular phylogenies providing a time frame for the evolution of the Callichthyinae. Here, we present a novel molecular data set for all Callichthyinae genera composed of partial sequences of mitochondrial and nuclear markers. These data were used to construct a fossil-calibrated tree for the Callichthyinae and to reconstruct patterns of spatiotemporal evolution. All phylogenetic analyses [Bayesian, maximum likelihood and maximum parsimony (MP)] resulted in a single fully resolved and well-supported hypothesis for the Callichthyinae, where Dianema is the sister group of all the remaining genera. Results suggest that the ancestry of most Callichthyinae genera originated in the Amazonas basin, with a number of subsequent ancestral dispersal events between adjacent basins. High divergences in sequences and time were observed for several samples of Hoplosternum littorale, Megalechis picta and Callichthys callichthys, suggesting that these species may contain cryptic diversity. The results highlight the need for a taxonomic revision of species complexes within the Callichthyinae, which may reveal more diversity within this relatively species-poor lineage.
Fausto Foresti - One of the best experts on this subject based on the ideXlab platform.
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Comparative cytogenetic studies in species of the subfamily Cal- lichthyinae (Teleostei: Siluriformes: Callichthyidae)
2014Co-Authors: Shimabukuro-dias Cristiane Kioko, Claudio Oliveira, Fausto ForestiAbstract:Abstract — In the present study, the karyotype of three species (nine populations) of the Callichthyinae subfamily were investigated with the objective of better understanding the pattern of relationship among the genera that com-pose the subfamily. Among the four populations of Callichthys callichthys studied, two showed 2n=56 chromosomes and two 2n=58 chromosomes. Up to eight additional microchromosomes were observed in the sample from Marı́lia. The three populations of Hoplosternum littorale displayed the same number of chromosomes, 2n=60, and karyotypic constitution, 6M+2SM+52A. The two populations of Megalechis personata showed 2n=62 chromosomes and similar karyotypic formulae, 8M+54A and 6M+2SM+54A. Terminal Ag-NORs were found in one chromosome pair of C. callichthys, H. littorale, and M. personata from Itiquira, and in two pairs in M. personata from Rio Branco. The popu-lations of C. callichthys showed C-band positive segments in centromeric and pericentromeric position and the popu-lations of H. littorale and M. personata exhibited C-band positive segments in centromeric and/or interstitial posi-tion. Contrarily to the extensive chromosome rearrangements verified in the Corydoradinae subfamily, in the Calli-chthyinae subfamily a small number of changes seems to have occurred in its karyotypic evolution
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Time-calibrated phylogeny for Hypoptopomatinae, Neoplecostominae and Otothyrinae.
2014Co-Authors: Fábio F. Roxo, Fausto Foresti, James S. Albert, Gabriel S. C. Silva, Cláudio H. Zawadzki, Claudio OliveiraAbstract:Tree topology from BEAST analysis of 155 specimens representing 113 loricariid species. Divergence ages calibrated by origins of Siluriformes (120 Mya) and Callichthyidae (55 Mya). Regions: A, Atlantic Coastal Drainages (Green); B, Upper Paraná Basin (Red); C, Paraguay, Lower Paraná and Uruguay Basins (Purple); D, Amazon and Orinoco Basins (Blue); E, São Francisco Basin and Northeastern Drainages (Yellow).
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historical biogeography and cryptic diversity in the callichthyinae siluriformes Callichthyidae
Journal of Zoological Systematics and Evolutionary Research, 2013Co-Authors: Tatiane C Mariguela, Fausto Foresti, Markos A Alexandrou, Claudio OliveiraAbstract:The family Callichthyidae, divided into the subfamilies Corydoradinae and Callichthyinae, contains more than 200 species of armoured catfishes distributed throughout the Neotropics, as well as fossil species dating from the Palaeocene. Both subfamilies are very widely distributed throughout the continent, with some species ranges extending across multiple hypothesized biogeographical barriers. Species with such vast geographical ranges could be made up of multiple cryptic populations that are genetically distinct and have diverged over time. Although relationships among Callichthyinae genera have been thoroughly investigated, the historical biogeography of the Callichthyinae and the presence of species complexes have yet to be examined. Furthermore, there is a lack of fossil-calibrated molecular phylogenies providing a time frame for the evolution of the Callichthyinae. Here, we present a novel molecular data set for all Callichthyinae genera composed of partial sequences of mitochondrial and nuclear markers. These data were used to construct a fossil-calibrated tree for the Callichthyinae and to reconstruct patterns of spatiotemporal evolution. All phylogenetic analyses [Bayesian, maximum likelihood and maximum parsimony (MP)] resulted in a single fully resolved and well-supported hypothesis for the Callichthyinae, where Dianema is the sister group of all the remaining genera. Results suggest that the ancestry of most Callichthyinae genera originated in the Amazonas basin, with a number of subsequent ancestral dispersal events between adjacent basins. High divergences in sequences and time were observed for several samples of Hoplosternum littorale, Megalechis picta and Callichthys callichthys, suggesting that these species may contain cryptic diversity. The results highlight the need for a taxonomic revision of species complexes within the Callichthyinae, which may reveal more diversity within this relatively species-poor lineage.
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Comparative cytogenetic studies in species of the subfamily Callichthyinae (Teleostei: Siluriformes: Callichthyidae)
Caryologia, 2005Co-Authors: Shimabukuro-dias Cristiane Kioko, Claudio Oliveira, Fausto ForestiAbstract:Abstract — In the present study, the karyotype of three species (nine populations) of the Callichthyinae subfamily were investigated with the objective of better understanding the pattern of relationship among the genera that compose the subfamily. Among the four populations of Callichthys callichthys studied, two showed 2n = 56 chromosomes and two 2n = 58 chromosomes. Up to eight additional microchromosomes were observed in the sample from Marilia. The three populations of Hoplosternum littorale displayed the same number of chromosomes, 2n = 60, and karyotypic constitution, 6M + 2SM + 52A. The two populations of Megalechis personata showed 2n = 62 chromosomes and similar karyotypic formulae, 8M + 54A and 6M + 2SM + 54A. Terminal Ag-NORs were found in one chromosome pair of C. callichthys, H. littorale, and M. personata from Itiquira, and in two pairs in M. personata from Rio Branco. The populations of C. callichthys showed C-band positive segments in centromeric and pericentromeric position and the popul...
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Molecular phylogeny of the armored catfish family Callichthyidae (Ostariophysi, Siluriformes).
Molecular phylogenetics and evolution, 2004Co-Authors: Cristiane Kioko Shimabukuro-dias, Claudio Oliveira, Roberto E. Reis, Fausto ForestiAbstract:The family Callichthyidae comprises eight genera of fishes widely distributed across the Neotropical region. In the present study, sequences of the mitochondrial genes 12S rRNA, 16S rRNA, ND4, tRNAHis, and tRNASer were obtained from 28 callichthyid specimens. The sample included 12 species of Corydoras, three species of Aspidoras, two species of Brochis, Dianema, Lepthoplosternum, and Megalechis, and two local populations of Callichthys and Hoplosternum. Sequences of Nematogenys inermis (Nematogenyidae), Trichomycterus areolatus, and Henonemus punctatus (Trichomycteridae), Astroblepus sp. (Astroblepidae), and Neoplecostomus paranensis, Delturus parahybae, and Hemipsilichthys nimius (Loricariidae) were included as the outgroup. Phylogenetic analyses were performed by using the methods of maximum parsimony and maximum likelihood. The results of almost all analyses were very similar. The family Callichthyidae is monophyletic and comprises two natural groups: the subfamilies Corydoradinae (Aspidoras, Brochis, and Corydoras) and Callichthyinae (Callichthys, Dianema, Hoplosternum, Lepthoplosternum, and Megalechis), as previously demonstrated by morphological studies. The relationships observed within these subfamilies are in several ways different from those previously proposed on the basis of morphological data. Molecular results were compared with the morphologic and cytogenetic data available on the family.
