New and Noteworthy Venezuelan Glanapterygine Catfishes (Siluriformes, Trichomycteridae), with Discussion of Their Biogeography and Psammophily

Schaefer, Scott A.; Provenzano, Francisco; Pinna, Mário de; Baskin, Jonathan N.

doi:10.1206/0003-0082(2005)496[0001:nanvgc]2.0.co;2

Cited by 29 publications

(37 citation statements)

References 8 publications

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“…The two species share a unique modification of the mesethmoid, unparalleled among trichomycterids. Their mesethmoid cornua are completely absent (this was previously proposed as an autapomorphy for P. magoi by Schaefer et al, 2005), so that the bone ends as a blunt rod in dorsal view (Figs. 8 and 10c).…”

Section: -Symphyseal Ligament Hypertrophiedmentioning

confidence: 83%

“…Subunits of HL were measured with an ocular micrometer attached to a stereomicroscope. Definitions of measurements follow Schaefer et al (2005). Cleared and counter-stained specimens were prepared according to slightly modified versions of Taylor & Van Dyke (1985) and Song & Parenti (1995).…”

Section: Methodsmentioning

confidence: 99%

“…Dark pigmentation very reduced in preserved fish. Scattered dark chromatophores along whole of dorsum, forming two faint dorsal longitudinal stripes alongside dorsal Schaefer et al, 2005) and it is possible that the papilla, and its putatively associated insemination, is synapomorphic for the two genera. Hypertrophied genital papillae are not present in species of Glanapteryx and Listrura, which have either small partly concealed papillae or no papilla at all.…”

Section: Pygidianops Amphioxus New Speciesmentioning

confidence: 99%

“…Glanapteryx niobium was described by de Pinna (1998) from an isolated locality in the rio Negro and Typhlobelus macromycterus by Costa & Bockmann (1994) from the rio Tocantins. Four additional species, two each of Pygidianops and Typhlobelus, were described from the río Orinoco drainage by Schaefer et al (2005). To date, a total of 14 glanapterygines species have been described, with a number of yet undescribed ones also known to exist.…”

Section: Introductionmentioning

confidence: 99%

“…Species of Pygidianops and Typhlobelus represent perhaps the most extreme instances of psammophilic adaptation in freshwater fishes. The unusual habitats of glanapterygines, reviewed in Nico & de Pinna (1996), Schaefer et al (2005) and Zuanon et al (2006), along with their small size, seem to explain their rarity in museum collections. Such circumstances, in turn, account for the numerous glanapterygines that remain undescribed.…”

Section: Introductionmentioning

confidence: 99%

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A new species of sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae)

Pinna

Kirovsky²

2011

Neotrop. ichthyol.

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A new species of sand-dwelling catfish genus Pygidianops, P. amphioxus, is described from the Negro and lower Amazon basins. The new species differs from its three congeners in the elongate eel-like body, the short barbels, and the small caudal fin, continuous with the body, among other traits of internal anatomy. The absence of anal fin further distinguishes P. amphioxus from all other Pygidianops species except P. magoi and the presence of eyes from all except P. cuao. The new Pygidianops seems to be the sister species to P. magoi, the two species sharing a unique mesethmoid with a dorsally-bent tip lacking cornua, and a produced articular process in the palatine for the articulation with the neurocranium. Pygidianops amphioxus is a permanent and highly-specialized inhabitant of psammic environments. Additional characters are proposed as synapomorphies of Pygidianops, including a hypertrophied symphyseal joint and associated ligament in the lower jaw; an elongate, laterally-directed, process on the dorsal surface of the premaxilla; and a rotated lower jaw, where the surface normally facing laterally in other glanapterygines is instead directed ventrally. These and other characters are incorporated into a revised phylogenetic diagnosis of Pygidianops.Uma nova espécie do gênero de bagre arenícola Pygidianops, P. amphioxus, é descrita de diferentes localidades na Amazônia brasileira. A nova espécie difere de seus três congêneres pelo corpo alongado e anguiliforme, pelos barbilhões curtos e pela pequena nadadeira caudal, contínua com o corpo, além de outras características da anatomia interna. A ausência de nadadeira anal distingue P. amphioxus de todos os outros Pygidianops exceto P. magoi e a presença de olhos de todos exceto P. cuao. O novo Pygidianops parece ser o grupo-irmão de P. magoi, as duas espécies compartilhando um mesetmóide com a extremidade dobrada dorsalmente, sem cornua, e um processo articular prolongado no palatino para articulação com o neurocrânio. Pygidianops amphioxus é um habitante permanente e altamente especializado de ambientes psâmicos. Caracteres adicionais são propostos como sinapomorfias para Pygidianops, incluindo uma articulação sinfiseana e ligamento associado hipertrofiados na mandíbula; um processo alongado e dirigido lateralmente na superfície dorsal do pré-maxilar; e a mandíbula rotacionada, de forma que a superfície normalmente lateral em outros Glanapteryginae é dirigida ventralmente. Estes e outros caracteres são incorporados em uma diagnose filogenética revisada de Pygidianops.

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Section: -Symphyseal Ligament Hypertrophiedmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Pygidianops Amphioxus New Speciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A new species of sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae)

Pinna

Kirovsky²

2011

Neotrop. ichthyol.

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Bibliography

2016

Fishes of the World

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The Laterosensory Canal System in Epigean and Subterranean Ituglanis (Siluriformes: Trichomycteridae), With Comments About Troglomorphism and the Phylogeny of the Genus

Rizzato

Bichuette

2016

Journal of Morphology

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The laterosensory system is a mechanosensory modality involved in many aspects of fish biology and behavior. Laterosensory perception may be crucial for individual survival, especially in habitats where other sensory modalities are generally useless, such as the permanently aphotic subterranean environment. In the present study, we describe the laterosensory canal system of epigean and subterranean species of the genus Ituglanis (Siluriformes: Trichomycteridae). With seven independent colonizations of the subterranean environment in a limited geographical range coupled with a high diversity of epigean forms, the genus is an excellent model for the study of morphological specialization to hypogean life. The comparison between epigean and subterranean species reveals a trend toward reduction of the laterosensory canal system in the subterranean species, coupled with higher intraspecific variability and asymmetry. This trend is mirrored in other subterranean fishes and in species living in different confined spaces, like the interstitial environment. Therefore, we propose that the reduction of the laterosensory canal system should be regarded as a troglomorphic (= cave-related) character for subterranean fishes. We also comment about the patterns of the laterosensory canal system in trichomycterids and use the diversity of this system among species of Ituglanis to infer phylogenetic relationships within the genus. J. Morphol. 278:4-28, 2017. ©© 2016 Wiley Periodicals,Inc.

show abstract

New and Noteworthy Venezuelan Glanapterygine Catfishes (Siluriformes, Trichomycteridae), with Discussion of Their Biogeography and Psammophily

Cited by 29 publications

References 8 publications

A new species of sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae)

A new species of sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae)

Bibliography

The Laterosensory Canal System in Epigean and Subterranean Ituglanis (Siluriformes: Trichomycteridae), With Comments About Troglomorphism and the Phylogeny of the Genus

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