Gymnotocinclus, Carvalho & A. & Reis, 2008

Carvalho, Tiago Pinto, A., Pablo Lehmann & Reis, Roberto E., 2008, Gymnotocinclus anosteos, a new uniquely-plated genus and species of loricariid catfish (Teleostei: Siluriformes) from the upper rio Tocantins basin, central Brazil, Neotropical Ichthyology 6 (3), pp. 329-338 : 330

publication ID

https://doi.org/ 10.1590/S1679-62252008000300006

DOI

https://doi.org/10.5281/zenodo.6495114

persistent identifier

https://treatment.plazi.org/id/03EE87A6-A025-FFD0-3B6F-6A39FABDB7EB

treatment provided by

Carolina

scientific name

Gymnotocinclus
status

gen. nov.

Gymnotocinclus View in CoL View at ENA , new genus

Type species: Gymnotocinclus anosteos View in CoL , by original designation ( Fig. 1 View Fig ).

Diagnosis. Gymnotocinclus is distinguished from all other hypoptopomatine genera by the following uniquely derived features: (1) extreme reduction of body dermal plates ( Fig. 2 View Fig ), (2) absence of the lateral connecting bone, (3) absence of bifid hemal spines on the abdominal vertebrae posterior to the first anal-fin proximal radial ( Fig. 3 View Fig ), and (4) odontode tips on last dermal plates on the caudal peduncle dorsally or anteriorly curved ( Fig. 4 View Fig ). Gymnotocinclus is also distinguished by a number of non-exclusive traits: maxillary barbel adnate to the lower lip; lateral ethmoid almost completely encapsulating the nasal organ ( Fig. 5 View Fig ); ventral margin of preopercle straight, not deflected medially; pectoral girdle exposed and supporting odontodes only in a restricted lateral area near base of pectoral fin ( Fig. 6 View Fig ); and absence of a pectoral-fin slit.

Etymology. From the Greek Gymnos, naked, and Otocinclus , a genus of the Hypoptopomatinae , in allusion to the extreme reduction of the body encasing dermal plates.

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