A new species of the blind and miniature genus<i>Micromyzon</i>Friel and Lundberg, 1996 (Silurifomes: Aspredinidae) from the Orinoco River: describing catfish diversity using high-resolution computed tomography

Carvalho, Tiago P.; Lundberg, John G.; Baskin, Jonathan N.; Friel, John; Reis, Roberto E.

doi:10.1635/053.165.0104

Cited by 9 publications

(13 citation statements)

References 15 publications

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“…9b-c). However, the new species shares with other Hoplomyzon the relative posterior position of the anal-fin, in which its pterygiophore is situated between the vertebrae 12 and 13, contrasting with an anal-fin pterygiophore situated between the vertebrae 11 and 12 in remaining Hoplomyzontini (Friel, Lundberg, 1996), another feature of ambiguous optimization due to inadequate comparisons of this structure with outgroups. Maxillary barbels are to some degree adnate to the head by a membrane in all Hoplomyzontini genera and do not diagnose Hoplomyzon from remaining taxa within the tribe.…”

Section: Discussionmentioning

confidence: 78%

“…Hoplomyzon cardosoi shares with other species of Hoplomyzon vertebral processes not overlapping adjacent ones (Figs. 3, 4 and 9), contrasting with adjacent processes overlapping subsequent ones in other species of Hoplomyzontini (Friel, 1994;Friel, Lundberg, 1996: fig. 4a).…”

Section: Discussionmentioning

confidence: 90%

“…4a). This feature has an ambiguous optimization if Hoplomyzon is the sister group to remaining Hoplomyzontini (Friel, 1994;Friel, Lundberg, 1996). Outgroup aspredinids lack comparable vertebral processes.…”

Section: Discussionmentioning

confidence: 99%

“…The dorsal and ventral vertebral processes are, respectively, dorsolateral and ventrolateral distally-flattened struts off the neural and hemal arches that form the dorsal and ventral body armor on the body surface (Taphorn, Marrero, 1990;fig. 4a;Friel, Lundberg, 1996;Carvalho et al, 2016). Institutional abbreviations follow Sabaj (2016).…”

Section: Methodsmentioning

confidence: 99%

“…Hoplomyzontins, composed of genera Hoplomyzon, Dupouyichthys Schultz, 1944, Ernstichthys, Fernández-Yépez, 1953and Micromyzon Friel & Lundberg, 1996, are generally collected in the deep channels of medium to large sized rivers and as a consequence they are rare in museum collections (Stewart, 1985;Taphorn, Marrero, 1990;Friel, Lundberg, 1996;Carvalho et al, 2016;Carvalho et al, in press). The distribution of Hoplomyzon species is restricted to piedmont tributaries of Lake Maracaibo, plus the Orinoco and Amazon basins (Friel, 2003).…”

Section: Introductionmentioning

confidence: 99%

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A new species of Hoplomyzon (Siluriformes: Aspredinidae) from Maracaibo Basin, Venezuela: osteological description using high-resolution computed microtomography of a miniature species

2017

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A new miniature species of banjo catfish of the genus Hoplomyzon is described from the Lake Maracaibo Basin in Venezuela. The new species is distinguished from all its congeners by the straight anterior margin of the mesethmoid (vs. a medial notch); a smooth and straight ventral surface of the premaxilla (vs. presence of bony knobs on the ventral surface of premaxilla); absence of teeth on dentary (vs. teeth present on dentary); configuration of ventral vertebral processes anterior to anal fin, which are composed of single processes anterior to anal-fin pterygiophore (vs. paired process); presence of several filamentous barbel-like structures on the ventral surface of head of adults (vs. small papillous structures in the ventral surface of head of adults); and 8 anal-fin rays (vs. 6 or 7). An extensive osteological description is made of the holotype using high-resolution x-ray computed microtomography (HRXCT).Keywords: Endemism, Ernstichthys intonsus, Miniaturization, Synapomorphy, Taxonomy.Se describe una nueva especie miniatura de pez banjo perteneciente al género Hoplomyzon, proveniente de tributarios del Lago Maracaibo en Venezuela. La nueva especie se diferencia de sus congéneres por presentar el margen anterior del mesetmoide recto (vs. con una hendidura central); superficie ventral de la premaxila lisa y recta (vs. superficie ventral de la premaxila con protuberancias óseas); ausencia de dientes en el dentario (vs. dientes presentes); configuración de los procesos anteriores ventrales de la aleta anal, los que están compuestos de procesos simples anteriores al pterigióforo de la aleta anal (vs. procesos dobles); presencia de varias estructuras en forma de barbillas en la superficie ventral de la cabeza (vs. pequeñas estructuras en forma de papilas en la superficie ventral de la cabeza); y 8 radios en la aleta anal (vs. 6 o 7). Una extensiva descripción osteológica del holotipo fue realizada utilizando microtomografía computarizada de rayos X de alta resolución (HRCXCT).

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new species of Hoplomyzon (Siluriformes: Aspredinidae) from Maracaibo Basin, Venezuela: osteological description using high-resolution computed microtomography of a miniature species

2017

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The pelvic girdle in extant gonorynchiformes (Teleostei: Otomorpha)

Koch,

Moritz

2024

Zoomorphology

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Otophysi is one of the most important fish taxa of the world, as they make up for roughly 28% of all fish species and about two-thirds of all freshwater species worldwide. To understand their success and evolutionary history their sister-group, the Gonorynchiformes, take a key-position, e.g., for reconstructing morphological conditions in the latest common ancestors. Gonorynchiformes comprising only 40 species and have been often studied for that reason. Their pelvic girdle, however, got only little attention so far. Therefore, we studied this structure in extant gonorynchiforms and described the ontogeny in Kneria stappersii. In gonorynchiforms: (1) their basipterygium is principally flat (without dorsal or ventral projections) and placed in horizontal position, (2) has a ‘simple’ shape, i.e., it has only a single anterior process with small cartilaginous tips and becomes wider in its posterior part with a medial portion connecting to the basipterygium of the other side; (3) three radials and a pelvic splint are present, and (4) a prominent posterior process is missing. Although, the morphological situation is a lot similar as seen in clupeiforms and alepocephaliforms. Therefore, these characters have likely been present in the stem of Otomorpha, Ostariophysi, and Otophysi, but within the latter taxon eventually, a higher diversity of pelvic girdle morphology arose during evolution.

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Molecular phylogeny of Banjo catfishes (Ostaryophisi: Siluriformes: Aspredinidae): A continental radiation in South American freshwaters

Carvalho

Arce

Reis

et al. 2018

Molecular Phylogenetics and Evolution

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A new species of the blind and miniature genusMicromyzonFriel and Lundberg, 1996 (Silurifomes: Aspredinidae) from the Orinoco River: describing catfish diversity using high-resolution computed tomography

Cited by 9 publications

References 15 publications

A new species of Hoplomyzon (Siluriformes: Aspredinidae) from Maracaibo Basin, Venezuela: osteological description using high-resolution computed microtomography of a miniature species

A new species of Hoplomyzon (Siluriformes: Aspredinidae) from Maracaibo Basin, Venezuela: osteological description using high-resolution computed microtomography of a miniature species

The pelvic girdle in extant gonorynchiformes (Teleostei: Otomorpha)

Molecular phylogeny of Banjo catfishes (Ostaryophisi: Siluriformes: Aspredinidae): A continental radiation in South American freshwaters

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