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Mendes, Luis F. - One of the best experts on this subject based on the ideXlab platform.
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Squamatinia algharbica gen. n. sp. n., a remarkable new Coletiniinae silverfish (Zygentoma: Nicoletiidae) from caves in southern Portugal
2012Co-Authors: Reboleira, Ana Sofia P. S., Gonçalves Fernando, Oromí Pedro, Mendes, Luis F.Abstract:Reboleira, Ana Sofia P. S., Gonçalves, Fernando, Oromí, Pedro, Mendes, Luis F. (2012): Squamatinia algharbica gen. n. sp. n., a remarkable new Coletiniinae silverfish (Zygentoma: Nicoletiidae) from caves in southern Portugal. Zootaxa 3260: 33-46, DOI: 10.5281/zenodo.20978
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New Nicoletiidae (Zygentoma: Insecta) from Brazil living in fire-ant (Hymenoptera: Insecta) nests
USP, 2009Co-Authors: Mendes, Luis F., Fox, Eduardo G. P. [unesp], Solis, Daniel R. [unesp], Bueno, Odair C. [unesp]Abstract:Descreve-se um novo Zygentoma (Nicoletiidae: Subnicoletiinae), mirmecófilo da formiga lava-pés Solenopsis saevissima (Formicidae: Myrmicinae) no Estado do Rio de Janeiro, Brasil: Allotrichotriura saevissima gen. nov. sp. nov. que é comparado com os géneros e subgéneros conhecidos na subfamília. As principais características diagnósticas respeitam a combinação da forma do corpo, quetotaxia cefálica e do corpo, morfologia do prétarso e número de estilos e vesículas abdominais. Embora prospecções recentes tenham sido levadas a cabo na localidade típica, apenas se conhece a amostra original, que integra exclusivamente fêmeas.A new myrmecophilous silverfish (Zygentoma: Nicoletiidae: Subnicoletiinae) from Rio de Janeiro, Brazil, found living in fire ant (Solenopsis saevissima, Formicidae: Myrmicinae) nests is described: Allotrichotriura saevissima gen. nov. sp. nov. is compared with the other genera and subgenera known in the subfamily. The main diagnostic features would include the combination of body shape, body and head setation, morphology of praetarsus, and number of abdominal stylets and vesicles. Although further quests were attempted at the type-locality, only the original described material, exclusively composed of females, remains known
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Sobre um novo Nicoletiidae (Zygentoma: Insecta) do Brasil vivendo com formigas lava-pés (Hymenoptera: Formicidae)
USP, 2009Co-Authors: Mendes, Luis F., Fox, Eduardo G. P., Solis, Daniel R., Bueno, Odair C.Abstract:Descreve-se um novo Zygentoma (Nicoletiidae: Subnicoletiinae), mirmecófilo da formiga lava-pés Solenopsis saevissima (Formicidae: Myrmicinae) no Estado do Rio de Janeiro, Brasil: Allotrichotriura saevissima gen. nov. sp. nov. que é comparado com os géneros e subgéneros conhecidos na subfamília. As principais características diagnósticas respeitam a combinação da forma do corpo, quetotaxia cefálica e do corpo, morfologia do prétarso e número de estilos e vesículas abdominais. Embora prospecções recentes tenham sido levadas a cabo na localidade típica, apenas se conhece a amostra original, que integra exclusivamente fêmeas.A new myrmecophilous silverfish (Zygentoma: Nicoletiidae: Subnicoletiinae) from Rio de Janeiro, Brazil, found living in fire ant (Solenopsis saevissima, Formicidae: Myrmicinae) nests is described: Allotrichotriura saevissima gen. nov. sp. nov. is compared with the other genera and subgenera known in the subfamily. The main diagnostic features would include the combination of body shape, body and head setation, morphology of praetarsus, and number of abdominal stylets and vesicles. Although further quests were attempted at the type-locality, only the original described material, exclusively composed of females, remains known
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Two new species of Nicoletiidae (Zygentoma, "Apterygota," Insecta) in Dominican amber. American Museum novitates ; no. 3226
New York NY : American Museum of Natural History, 1998Co-Authors: Sturm Helmut., Mendes, Luis F.Abstract:11 p. : ill. ; 26 cm.Includes bibliographical references (p. 5)."Trinemurodes antiquus, n. sp., and Trinemurodes miocenicus, n. sp., from Dominican amber (ca. 20 Ma) are the first fossil species of the family Nicoletiidae. They can be placed in the genus Trinemurodes (subfamily Subnicoletiinae) with two extant species living in the Malesian area (Sumatra and the Moluccas), making these the only known New World species of the genus. The rarity of the Nicoletiidae in the fossil record contrasts with other families of Zygentoma (Ateluridae, Lepidotrichidae, Lepismatidae), probably a result of their more edaphic mode of life"--P. [1]
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Microcoryphia y Zygentoma (Insecta: Apterygota) de Retuerta de Pina (Zaragoza: Monegros)
1993Co-Authors: Bach De Roca, Carmen, Gaju-ricart Miguel, Mendes, Luis F., Molero-baltanás RafaelAbstract:Se estudian los Microcoryphia y Zygentoma del término municipal de Pina de Ebro, situado en los Monegros (Zaragoza), se han hallado un total de 11 tazones, de los cuales, 4 pertenecen al Orden Microcoryphia y 7 al O. Zygentoma. Dentro de los Microcoryphia, cada taxón corresponde a un género, siendo la primera vez que Silvestrichilis se cita para la comunidad aragonesa. Es la primera ocasión en que se halla el género Machilis en Zaragoza, describiéndose una nueva especie: M. blascoi. Del O. Zygentoma se han hallado 7 taxones, agrupados en 4 géneros, siendo todos ellos nuevas citas para la Comunidad Autónoma de Aragón
Luis Espinasa - One of the best experts on this subject based on the ideXlab platform.
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DNA sequences of troglobitic nicoletiid insects support Sierra de El Abra and the Sierra de Guatemala as a single biogeographical area: Implications for Astyanax
Pensoft Publishers, 2014Co-Authors: Luis Espinasa, Nicole D. Bartolo, Catherine E. NewkirkAbstract:The blind Mexican tetra fish, Astyanax mexicanus, has become the most influential model for research of cave adapted organisms. Many authors assume that the Sierra de Guatemala populations and the Sierra de El Abra populations are derived from two independent colonizations. This assumption arises in part from biogeography. The 100 m high, 100 m wide Servilleta Canyon of the Boquillas River separates both mountain ranges and is an apparent barrier for troglobite dispersion. Anelpistina quinterensis (Nicoletiidae, Zygentoma, Insecta) is one of the most troglomorphic nicoletiid silverfish insects ever described. 16S rRNA sequences support that this species migrated underground to reach both mountain ranges within less than 12,000 years. Furthermore, literature shows a plethora of aquatic and terrestrial cave restricted species that inhabit both mountain ranges. Thus, the Servilleta canyon has not been an effective biological barrier that prevented underground migration of troglobites between the Sierra de Guatemala and the Sierra de El Abra. The Boquillas River has changed its course throughout time. Caves that in the past connected the two Sierras were only recently geologically truncated by the erosion of the new river course. It is likely that, with the geological changes of the area and throughout the 2-8 million years of evolutionary history of cave Astyanax, there have been opportunities to migrate across the Servilleta canyon
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Distribution and conservation status of Speleonycta ozarkensis (Insecta, Zygentoma, Nicoletiidae) from caves of the Ozark Highlands of Arkansas and Oklahoma, USA
Pensoft Publishers, 2014Co-Authors: Luis Espinasa, Michael E Slay, Monika Espinasa, Dante B. Fenolio, Matthew NiemillerAbstract:The “thysanuran” (Zygentoma: Nicoletiidae) Speleonycta ozarkensis is the only troglobiotic nicoletiid from the Ozark Highlands. It was originally described with only four specimens from four different cave systems in Arkansas and Oklahoma. The scarcity of available specimens has made it difficult to determine whether morphological variation among populations represents intraspecific or interspecific variation. We examined molecular (16S rRNA) variation among populations and found no evidence that they represent a species complex. Because of its limited distribution and lack of ecological and life history data, S. ozarkensis may be a species of conservation concern. We therefore conducted a conservation status assessment. We bioinventoried 44 caves in Arkansas and Oklahoma to determine the distribution of S. ozarkensis. A new locality in Adair Co., Oklahoma, was discovered and new specimens were collected to better assess morphological variation among populations. Data on ecology and life history was gathered. We determined the conservation status of the species and identified potential threats to existing populations. Despite being known from a few localities, S. ozarkensis has a broad distribution approaching 10,000 km2. Molecular data suggest S. ozarkensis is capable of considerable dispersal and is primarily an epikarstic species, perhaps explaining why it has been infrequently collected from caves. Conservation assessments revealed that S. ozarkensis is at a slight risk of extinction. We identified seven threats impacting populations that vary in scope and severity, but only recreational caving (three caves) and development associated with urbanization (one cave) have the greatest potential to immediately impact populations
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a new genus of the subfamily cubacubaninae insecta Zygentoma nicoletiidae from caves in south central and southwestern usa
Journal of Cave and Karst Studies, 2010Co-Authors: Luis Espinasa, Stephen Furst, Thomas Allen, Michael E SlayAbstract:The genus Speleonycta is erected, and S. ozarkensis, n. sp., is described and separated from other species of the subfamily Cubacubaninae. The type species was collected from several caves in the Ozark Plateau, while two more species, collected from a cave in Arizona and from a cave in California, remain under study. Morphology and preliminary analyses using histone DNA indicate that the new genus may be related to Texoreddellia, another nicoletiid from caves of Texas and northern Mexico.
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phylogeny of the american silverfish cubacubaninae hexapoda Zygentoma nicoletiidae a combined approach using morphology and five molecular loci
Cladistics, 2007Co-Authors: Luis Espinasa, Casey Flick, Gonzalo GiribetAbstract:Relationships within the subfamily Cubacubaninae, the dominant subfamily of Nicoletiidae in America, are appraised based on parsimony analysis of 20 morphological characters and sequence data from five loci (nuclear 18S and 28S rRNA, mitochondrial 16S rRNA, nuclear protein coding gene histone H3, and mitochondrial protein coding gene cytochrome c oxidase subunit I). The data, analyzed under direct optimization for a range of analytical parameter sets, indicated that species may show some biogeographical structure. It also indicated that the presence of articulated submedian appendages on urosternum IV is not a valid discriminating character in taxonomy. Species within the traditional genera Anelpistina, Cubacubana and Neonicoletia were found to belong to a group in which no clear morphological or molecular distinction was present. It is proposed that members of these three genera should be united within a single taxon. On the contrary, the genus Prosthecina is well supported by the data. © The Willi Hennig Society 2006.
Magdalena Maria Rost - One of the best experts on this subject based on the ideXlab platform.
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Comparative Studies on Regeneration of the Midgut Epithelium in Lepisma saccharina and Thermobia domestica
Annals of the Entomological Society of America, 2006Co-Authors: Magdalena Maria RostAbstract:Regeneration is a process of rebuilding damaged or disrupted cells and tissues. The insect's midgut epithelium becomes damaged by passage of the food mass and by secretory processes. The regeneration process occurs differently in two related species belonging to the primitive wingless insect group Zygentoma: Thermobia domestica (Packard) (Thysanura: Lepismatidae) and Lepisma saccharina L. (Thysanura: Lepismatidae). In T. domestica, the degenerated cells are replaced in a continuous manner by newly formed cells originating from regenerative cell groups. In L. saccharina, the midgut epithelium is totally removed and numerous regenerative cell groups form the new epithelium simultaneously in a cyclical manner. Regenerative cells, being responsible for all regenerative mechanisms, fulfill the role of primordial cells of the midgut epithelium. Here, I describe the process of degeneration and regeneration of the midgut epithelium in these two species at the transmission electron microscope level.
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Cellularization During Embryogenesis in Thermobia domestica (Zygentoma: Lepismatidae)
Annals of the Entomological Society of America, 2006Co-Authors: Magdalena Maria Rost, Izabela PoprawaAbstract:During the first day of embryogenesis in firebrat, Thermobia domestica (Packard) (Zygentoma: Lepismatidae), energids (nuclei surrounded by a thin layer of nonmembraned cytoplasm) migrate toward the periplasm. Some of them are dispersed in the periplasm, whereas others remain inside the yolk. As the first syncytial blastoderm is formed, the oolemma invaginates deeply into the yolk forming numerous folds. These folds surround the energids that are settled in the periplasm. The cellular blastoderm, formed at the end of cleavage, remains thin. These cellularization events are described at the ultrastructural level. Our previous studies dealt with midgut epithelium formation. Our current results indicate that the same mechanism of cellularization occurs in both processes in this primitive wingless insect. The similarities between the mode of cellularization of the blastoderm and the midgut epithelium are discussed.
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Primordial Germ Cell Differentiation in Natural and Manipulated Twin Embryos of Thermobia domestica (Insecta: Zygentoma)
Annals of the Entomological Society of America, 2005Co-Authors: Magdalena Maria Rost, Agnieszka Flakus, Jerzy KlagAbstract:In eggs of many insects there exists a characteristic structure called an oosom that is required for the formation and differentiation of primordial germ cells (PGCs). Thermobia domestica (Packard) belongs to the group of insects in which there are no visible signs of such germ cell determinants and PGCs are formed at the later stages of development. Spontaneous and experimental polyembryony helps to resolve the problem of germ cells determinants existence. The stratification of cytoplasmic inclusions in T. domestica eggs causes the displacement of germ cells determinants. As a result, all twin embryos and some single embryos (experimental polyembryony) have sterile gonads.
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Ultrastructure of the Pleuropodium in 8-d-old Embryos of Thermobia domestica (Packard) (Insecta, Zygentoma)
Annals of the Entomological Society of America, 2004Co-Authors: Magdalena Maria Rost, Izabela Poprawa, Jerzy KlagAbstract:Pleuropodia of the invaginated type were observed on the first abdominal segment in 8-d-old embryos of Thermobia domestica (Packard). The pleuropodium is formed by a cytoplasmatic internal part and a mushroom-like cavity. The latter is filled with fluid and is composed of a stem protruding through the epidermis and a vesicle-like copula. The arrangement of membrane folds, mitochondria, and lipid drops was observed on electron micrographs (TEM) of pleuropodium cells. The position and structure of these organelles indicates that the cells of this organ perform transport and secretory functions.
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Structure and ultrastructure of the egg capsule of Thermobia domestica (Packard) (Insecta, Zygentoma).
Folia biologica, 2004Co-Authors: Izabela Poprawa, Magdalena Maria RostAbstract:Eggs of Thermobia domestica (Packard) were collected from a laboratory culture. They were prepared for analysis in light and electron microscopes (TEM, SEM). A few hours after oviposition the egg capsule starts to tarnish and changes its colour to brown. Polygonic shapes on its surface can be seen. The egg capsule consists of a thin vitelline envelope and the chorion. The chorion consists of a one-layered endochorion and a three-layered exochorion. There are minor and major mushroom-like structures placed on the surface of the chorion. Their function is proposed. One micropyle is observed on the anterior pole of the egg. The micropylar opening is formed on the process of a follicular cell.
Andreas Vilcinskas - One of the best experts on this subject based on the ideXlab platform.
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Evolution of insect olfactory receptors
2016Co-Authors: Christine Missbach, Bill S. Hansson, Hany Km Dweck, Heiko Vogel, Andreas Vilcinskas, Marcus C Stensmyr, Ewald Grosse-wildeAbstract:Abstract The olfactory sense detects a plethora of behaviorally relevant odor molecules; gene families involved in olfaction exhibit high diversity in different animal phyla. Insects detect volatile molecules using olfactory (OR) or ionotropic receptors (IR) and in some cases gustatory receptors (GRs). While IRs are expressed in olfactory organs across Protostomia, ORs have been hypothesized to be an adaptation to a terrestrial insect lifestyle. We investigated the olfactory system of the primary wingless bristletail Lepismachilis y-signata (Archaeognatha), the firebrat Thermobia domestica (Zygentoma) and the neopteran leaf insect Phyllium siccifolium (Phasmatodea). ORs and the olfactory coreceptor (Orco) are with very high probability lacking in Lepismachilis; in Thermobia we have identified three Orco candidates, and in Phyllium a fully developed OR/Orco-based system. We suggest that ORs did not arise as an adaptation to a terrestrial lifestyle, but evolved later in insect evolution, with Orco being present before the appearance of ORs. DOI: 10.7554/eLife.02115.00
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Identification of immune-related genes from an apterygote insect, the firebrat Thermobia domestica.
Insect biochemistry and molecular biology, 2007Co-Authors: Boran Altincicek, Andreas VilcinskasAbstract:In this study, we report the analysis of the immune-related transcriptome from an apterygote insect, the firebrat Thermobia domestica (Zygentoma, Lepismatidae), which currently emerges as a suitable model insect for evolutionary and developmental studies. The suppression subtractive hybridization method was used for targeted screening of genes that are up-regulated in response to injected bacterial lipopolysaccharide (LPS). A subtracted cDNA library enriched in immune-inducible genes was constructed and analysis of 288 cDNAs resulted in identification of 26 novel genes in T. domestica. Among these immune-related transcripts we found homologues of genes from other insects which are involved in the regulation of signaling cascades and six novel putative antimicrobial peptides. The identified genes implicate the presence of sophisticated regulatory mechanisms in insect immune signaling and give insight into evolutionarily conserved features of insect innate immunity.
Christian Pick - One of the best experts on this subject based on the ideXlab platform.
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The occurrence of hemocyanin in Hexapoda
The FEBS journal, 2009Co-Authors: Christian Pick, Marco SchneuerAbstract:Hemocyanins are copper-containing, respiratory proteins that have been thoroughly studied in various arthropod subphyla. Specific O2-transport proteins have long been considered unnecessary in Hexapoda (including Insecta), which acquire O2 via an elaborate tracheal system. However, we recently identified a functional hemocyanin in the stonefly Perla marginata (Plecoptera) and in the firebrat Thermobia domestica (Zygentoma). We used RT-PCR and RACE experiments to study the presence of hemocyanin in a broad range of ametabolous and hemimetabolous hexapod taxa. We obtained a total of 12 full-length and 5 partial cDNA sequences of hemocyanins from representatives of Collembola, Archeognatha, Dermaptera, Orthoptera, Phasmatodea, Mantodea, Isoptera and Blattaria. No hemocyanin could be identified in Protura, Diplura, Ephemeroptera, Odonata, or in the Eumetabola (Holometabola + Hemiptera). It is not currently known why hemocyanin has been lost in some taxa. Hexapod hemocyanins usually consist of two distinct subunit types. Whereas type 1 subunits may represent the central building block, type 2 subunits may be absent in some species. Phylogenetic analyses support the Pancrustacea hypothesis and show that type 1 and type 2 subunits diverged before the emergence of the Hexapoda. The copperless insect storage hexamerins evolved from hemocyanin type 1 subunits, with Machilis germanica (Archeognatha) hemocyanin being a possible ‘intermediate’. The evolution of hemocyanin subunits follows the widely accepted phylogeny of the Hexapoda and provides strong evidence for the monophyly of the Polyneoptera (Plecoptera, Dermaptera, Orthoptera, Phasmatodea, Mantodea, Isoptera, Blattaria) and the Dictyoptera (Mantodea, Isoptera, Blattaria). The Blattaria are paraphyletic with respect to the termites.
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Molecular characterization of hemocyanin and hexamerin from the firebrat Thermobia domestica (Zygentoma)
Insect biochemistry and molecular biology, 2008Co-Authors: Christian Pick, Silke Hagner-hollerAbstract:Hexapods possess a tracheal system that enables the transport of oxygen to the inner organs. Although respiratory proteins have been considered unnecessary in most Hexapoda for this reason, we recently showed the presence of a functional hemocyanin in the stonefly Perla marginata. Here we report the identification and molecular characterization of a hemocyanin from Zygentoma (Thysanura). We obtained the full length cDNA of two distinct subunit types from the firebrat Thermobia domestica, and partial sequences of the orthologs from the silverfish Lepisma saccharina. The native T. domestica hemocyanin subunits both consist of 658 amino acids, but a signal peptide for transmembrane transport is missing in subunit 2. In adult firebrats both hemocyanin subunits represent a substantial proportion of the total hemolymph proteins. Phylogenetic analyses show that the subunit types are orthologous to subunits 1 and 2 of the stonefly Perla marginata. We further identified and sequenced a hexamerin subunit from T. domestica (689 amino acids), which suggests an early emergence of this type of proteins in hexapod evolution. In contrast to most other hexamerins, it does not reveal a high content in phenylalanine and tyrosine, which may be interpreted that the accumulation of aromatic amino acids commenced later in hexamerin evolution. Molecular clock calculations using hexamerins suggest that the divergence of Zygentoma and Pterygota occurred around 387 million years ago, which is in excellent agreement with the available fossil record.