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Dietrich L. Meyer - One of the best experts on this subject based on the ideXlab platform.
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The valvula cerebelli of the spiny eel, Macrognathus aculeatus, receives primary lateral-line afferents from the rostrum of the upper jaw
Cell and Tissue Research, 1991Co-Authors: Mario F. Wullimann, Michael H. Hofmann, Dietrich L. MeyerAbstract:In the spiny eel, Macrognathus aculeatus , anterodorsal and (to a lesser degree) anteroventral lateralline nerves project massively to the granular layer of the valvula cerebelli, throughout its rostrocaudal extent. The posterior lateral-line nerve terminates in the corpus cerebelli. Thus, valvula and corpus cerebelli are supplied with mechanosensory input of different peripheral origins. An analysis of the taxonomic distribution of experimentally determined primary lateral-line input to the three parts of the teleostean cerebellum reveals that the eminentia granularis always receives such input, and that the corpus cerebelli is the recipient of primary lateral-line input in many teleosts. The valvula, however, receives primary lateral-line afferents in only two examined species. In M. aculeatus , the massive lateral-line input to the valvula probably originates in mechanoreceptors located in the elongated rostrum of the upper jaw, a characteristic feature of mastacembeloid fishes. This projection to the valvula may therefore represent a unique specialization that arose with the evolution of the peculiar rostrum.
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primary lateral-line afferents from the rostrum of the upper jaw
1991Co-Authors: Mario F. Wullimann, Michael H. Hofmann, Dietrich L. MeyerAbstract:Summary. In the spiny eel, Macrognathus aculeatus, an-terodorsal and (to a lesser degree) anteroventral lateral-line nerves project massively to the granular layer of the valvula cerebelli, throughout i s rostrocaudal extent. The posterior lateral-line nerve terminates in the corpus cerebelli. Thus, valvula and corpus cerebelli are supplied with mechanosensory input of different peripheral ori-gins. An analysis of the taxonomic distribution of experi-mentally determined primary lateral-line input to the three parts of the teleostean cerebellum reveals that the eminentia granularis always receives uch input, and that the corpus cerebelli is the recipient of primary lateral-line input in many teleosts. The valvula, however, receives primary lateral-line afferents in only two examined spe-cies. In M. aculeatus, the massive lateral-line input to the valvula probably originates in mechanoreceptors lo-cated in the elongated rostrum of the upper jaw, a char-acteristic feature of mastacembeloid f shes. This projec-tion to the valvula may therefore represent a unique specialization that arose with the evolution of the pecu-liar rostrum
Mario F. Wullimann - One of the best experts on this subject based on the ideXlab platform.
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The valvula cerebelli of the spiny eel, Macrognathus aculeatus, receives primary lateral-line afferents from the rostrum of the upper jaw
Cell and Tissue Research, 1991Co-Authors: Mario F. Wullimann, Michael H. Hofmann, Dietrich L. MeyerAbstract:In the spiny eel, Macrognathus aculeatus , anterodorsal and (to a lesser degree) anteroventral lateralline nerves project massively to the granular layer of the valvula cerebelli, throughout its rostrocaudal extent. The posterior lateral-line nerve terminates in the corpus cerebelli. Thus, valvula and corpus cerebelli are supplied with mechanosensory input of different peripheral origins. An analysis of the taxonomic distribution of experimentally determined primary lateral-line input to the three parts of the teleostean cerebellum reveals that the eminentia granularis always receives such input, and that the corpus cerebelli is the recipient of primary lateral-line input in many teleosts. The valvula, however, receives primary lateral-line afferents in only two examined species. In M. aculeatus , the massive lateral-line input to the valvula probably originates in mechanoreceptors located in the elongated rostrum of the upper jaw, a characteristic feature of mastacembeloid fishes. This projection to the valvula may therefore represent a unique specialization that arose with the evolution of the peculiar rostrum.
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primary lateral-line afferents from the rostrum of the upper jaw
1991Co-Authors: Mario F. Wullimann, Michael H. Hofmann, Dietrich L. MeyerAbstract:Summary. In the spiny eel, Macrognathus aculeatus, an-terodorsal and (to a lesser degree) anteroventral lateral-line nerves project massively to the granular layer of the valvula cerebelli, throughout i s rostrocaudal extent. The posterior lateral-line nerve terminates in the corpus cerebelli. Thus, valvula and corpus cerebelli are supplied with mechanosensory input of different peripheral ori-gins. An analysis of the taxonomic distribution of experi-mentally determined primary lateral-line input to the three parts of the teleostean cerebellum reveals that the eminentia granularis always receives uch input, and that the corpus cerebelli is the recipient of primary lateral-line input in many teleosts. The valvula, however, receives primary lateral-line afferents in only two examined spe-cies. In M. aculeatus, the massive lateral-line input to the valvula probably originates in mechanoreceptors lo-cated in the elongated rostrum of the upper jaw, a char-acteristic feature of mastacembeloid f shes. This projec-tion to the valvula may therefore represent a unique specialization that arose with the evolution of the pecu-liar rostrum
Michael Hofmann - One of the best experts on this subject based on the ideXlab platform.
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a direct primary afferent projection of the trigeminal nerve to the valvula cerebelli in the spiny eel Macrognathus zebrinus
Neuroscience Letters, 2013Co-Authors: Matthias Schmidt, Michael HofmannAbstract:This study is a re-examination of the direct primary sensory input to the valvula cerebelli in spiny eel. The valvula in Macrognathus zebrinus receives a primary afferent projection from the trigeminal nerve as revealed by injections of biotinylated dextran amines into the rostrum. The descending trigeminal nucleus and nucleus of the tractus solitarius are innervated as well. Injections with DiI into the valvula labeled fibers in the descending trigeminal nucleus. The projection of tactile information from the rostrum to the valvula may be an adaptation of food search for spiny eels in regard to their highly mobile rostrum.
M. Serajuddin - One of the best experts on this subject based on the ideXlab platform.
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Food and feeding habits of peacock eel, Macrognathus aculeatus (Bloch, 1786) from Eastern Uttar Pradesh, India
International Journal of Fisheries and Aquatic Studies, 2016Co-Authors: Aysha Aziz Faridi, M Moshahid A Rizvi, M. SerajuddinAbstract:Feeding intensity in relation to season and maturity stages and food items of peacock eel, Macrognathus aculeatus (Bloch, 1786) were investigated. Slenderical body, well developed dentition, modified gill rakers, strongly built stomach and short intestine are some of the characteristics that were related to fish’s dietary composition. There was no major shift in from the basically carnivorous orientation of the fish during its various life stages. Forage fish and annelids were the basic food of adult while aquatic insects and annelids were eaten by juveniles. Feeding intensity was high in stage III at which gonad ripens and was relatively low in the specimens with ripe gonads. Large size fish consumed more food during autumn while smaller individuals feed heavily during post monsoon and autumn. Juveniles and adults both consumed lesser quantity of food during winter, but there was no cessation of feeding in any period of their life.
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Length-Weight, Length-Length Relationship of the Spiny Eel, Macrognathus pancalus (Hamilton 1822) sampled from Ganges and Brahmaputra river basins, India
Iranian Journal of Fisheries Sciences, 2013Co-Authors: B. C. Pathak, M. Zahid, M. SerajuddinAbstract:The freshwater spiny eel, Macrognathus pancalus is an inland water teleost fish commonly known as barred or striped spiny eel found in Asia. The sampling areas were selected which are spatially and geographically different and characterized by different environmental conditions in order to elucidation of ecotype. A total 345 specimens were collected from the sampling sites during January 2008 to December 2010. The weight of M. pancalus in the present study nearly the cube of its length in all cases as the values of regression coefficient „b‟ were found to be close to 3. The length weight relationship indicated the isometric growth in all the samples of striped spiny eel collected from different environmental condition. The coefficient of regression „b‟ were more in the riverine population (3.17±0.08) as compared to the populations of a large lake i.e. Beel (2.85±0.13). The coefficient of determination, (r 2 ) in all the cases was highly significant (p< 0.001). The relative condition factor (Kn) were also calculated and the average of condition factor in riverine and beel populations of spiny eel were found to be 0.50±0.09, and 0.47±0.05, respectively. The lengthlength relationship was highly correlated (r 2 = 0.99 at P
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Morphometric Variation among Barred Spiny Eel, Macrognathus pancalu s (Hamilton 1822), Populations from the Ganges and Brahmaputra River Basin, India by Using Geomorphometrics
2013Co-Authors: M. SerajuddinAbstract:The freshwater barred spiny eel, Macrognathus pancalus is an inland telostean fish. It is found in the le ntic as well as lotic environment. This model system shows phenotypic plasticity in allopatry. Here we used the landmark-bas ed geometric morphometric methods for describing the patterns of body shape variation and shape co-variation with s ize among the populations of the barred spiny eel Macrognathus pancalus . We found a significant body shape variation among the populations of river basins. The principal componen t analysis followed by discriminate function analys is showed 99.43 % body shape variation with a cross validation of 99. 4 %.
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Comparative Analysis of Reproductive Traits in Barred Spiny Eel, Macrognathus pancalus (Hamilton, 1822) from Lotic and Lentic Ecosystems of Gangatic Basin, India
2012Co-Authors: R. Ali, M. SerajuddinAbstract:2 Abstract: The comparative pattern of the reproductive biology dealing with sex ratio, spawning, gonadosomatic index, ova diameter and fecundity of freshwater barred spiny eel, Macrognathus pancalus were investigated. Fish were collected from two different geographical areas characterizing by different environmental conditions in order to elucidation of ecotypes. Male barred spiny eel was slightly dominated in the specimens collected from lentic (ponds) habitats at SRN-Bhadohi while female dominated in the population of lotic environment (Gomti River) in Lucknow region of Gangetic Basin respectively. Monthly fluctuations in gonadosomatic index were recorded with maximum value (one peak) during August in the specimens collected from ponds while two peaks were recorded during March and July in the population of river. The size at the first maturity was also determined. Ova diameter revealed the release of only one batch of mature ova in the population of ponds and two batches of ova in the population of river indicating single and double spawning periods respectively. The average relative fecundity was 82 and 72 eggs cm body length in the populations of lentic and lotic habitats 1
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Genetic Diversity in Barred Spiny Eel, Macrognathus pancalus (Hamilton, 1822) Sampled from Two Rivers (Gomti and Ghagra) of Gangetic Basin, India
2012Co-Authors: M. SerajuddinAbstract:The random amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR) was applied to analyze the genetic variation in the populations of barred spiny eel, Macrognathus pancalus collected from two rivers (Gomti and Ghagra ) in Gangatic basin of Uttar Pradesh, India. The two random primers OPB-1 (5'GTTTCGCTCC3') and OPB-3 (5'CATCCCCCTG3') were used in order to determine the genetic diversity of barred spiny eel. These random primers produced polymorphic as well as monomorphic loci. The polymorphic loci indicated the genetic variation among the populations of barred spiny eel. The random primer OPB-1 showed more polymorphism (20.59%) in the population of river Ghaghra compared to the population of river Gomti (13.43%) while the primer OPB-3 showed more polymorphic loci (33.68%) in the population of river Gomti as compared to the population of river Ghaghra (8.82%). The number of maximum polymorphic loci in the population of river Gomti indicated the more genetic variability as compared to the population of river Ghaghara. These differences in the genetic structure among the populations of barred spiny eel will be helpful for the conservation of M. pancalus.
Mauricio M. Rocha - One of the best experts on this subject based on the ideXlab platform.
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Estudo taxonômico de Cylindrotermes Holmgren (Isoptera, Termitidae Termitinae)
Papéis Avulsos de Zoologia, 2007Co-Authors: Mauricio M. Rocha, Eliana M. CancelloAbstract:A taxonomic study of Cylindrotermes Holmgren (Isoptera, Termitidae, Termitinae) is presented, with a redescription of the genus, a description of three new species C. caata, C. capixaba and C. sapiranga, and a redescription of four out of the five previously known species: C. parvignathus, C. brevipilosus, C. Macrognathus and C. flangiatus. The imagos of C. brevipilosus and C. Macrognathus are described for the first time. Illustrations of all soldiers and imagos are provided, as well as an identificaton key based on soldiers.
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Estudo taxonômico de Cylindrotermes Holmgren (Isoptera, Termitidae Termitinae)
Universidade de São Paulo (USP) Museu de Zoologia (MZUSP)., 2007Co-Authors: Mauricio M. Rocha, Cancello, Eliana MarquesAbstract:A taxonomic study of Cylindrotermes Holmgren (Isoptera, Termitidae, Termitinae) is presented, with a redescription of the genus, a description of three new species C. caata, C. capixaba and C. sapiranga, and a redescription of four out of the five previously known species: C. parvignathus, C. brevipilosus, C. Macrognathus and C. flangiatus. The imagos of C. brevipilosus and C. Macrognathus are described for the first time. Illustrations of all soldiers and imagos are provided, as well as an identificaton key based on soldiers.O trabalho é um estudo taxonômico de Cylindrotermes Holmgren (Isoptera, Termitidae, Termitinae), incluindo a redescrição do gênero, a descrição de três espécies novas C. caata, C. capixaba e C. sapiranga, além da redescrição de quatro, das cinco espécies anteriormente conhecidas: C. parvignathus, C. brevipilosus, C. Macrognathus e C. flangiatus. Os alados de C. brevipilosus e C. Macrognathus são descritos pela primeira vez. Há ilustrações de todos os soldados e alados das espécies estudadas, bem como uma chave dicotômica de identificação baseada nos soldados
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Estudo taxonômico de Cylindrotermes Holmgren (Isoptera, Termitidae Termitinae)
Museu de Zoologia da Universidade de São Paulo, 2007Co-Authors: Mauricio M. Rocha, Cancello, Eliana MarquesAbstract:O trabalho é um estudo taxonômico de Cylindrotermes Holmgren (Isoptera, Termitidae, Termitinae), incluindo a redescrição do gênero, a descrição de três espécies novas C. caata, C. capixaba e C. sapiranga, além da redescrição de quatro, das cinco espécies anteriormente conhecidas: C. parvignathus, C. brevipilosus, C. Macrognathus e C. flangiatus. Os alados de C. brevipilosus e C. Macrognathus são descritos pela primeira vez. Há ilustrações de todos os soldados e alados das espécies estudadas, bem como uma chave dicotômica de identificação baseada nos soldados
