Gymnotocinclus Anosteos (Gymnotocinclus anosteos), first described by Carvalho, Lehmann A. & Reis, 2008 is a tiny fish. Adults typically reach 4.40 cm in maximum length. It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Tropical waters. On the IUCN Red List, it is classified as Least Concern.
Gymnotocinclus is distinguished from all other hypoptopomatine genera by the following uniquely derived features: extreme reduction of body dermal plates; absence of the lateral connecting bone; absence of bifid hemal spines on the abdominal vertebrae posterior to the first anal-fin proximal radial; and odontode tips on last dermal plates on the caudal peduncle dorsally or anteriorly curved. Gymnotocinclus is also distinguished by a number of non-exclusive traits: maxillary barbel adnateto the lower lip; lateral ethmoid almost completely encapsulating the nasal organ; 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; and absence of a pectoral-fin slit .: elongated.
Behavioural data for Gymnotocinclus Anosteos is currently being reviewed.
Freshwater; benthopelagic. Tropical; 14°S - 15°S, 47°W - 48°W South America: Brazil.
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