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Listrura gyrinura Costa, Feltrin & Katz, 2023 |
| Family: | Trichomycteridae (Pencil or parasitic catfishes), subfamily: Microcambevinae | |||
| Max. size: | 4.16 cm SL (male/unsexed) | |||
| Environment: | benthopelagic; freshwater | |||
| Distribution: | South America: Brazil. | |||
| Diagnosis: | Dorsal soft rays (total): 6-8; Anal soft rays: 8-8; Vertebrae: 51-52. This species is distinguished from its congeners by the following set of characters: deep caudal peduncle, deeper than the preanal region of the body, as the result of an expanded skin fold involving procurrent caudal-fin rays; vertebrae 51 or 52; process on the dorsal surface of the autopalatine articular facet for the mesethmoid absent; mesethmoid cornu being slightly posteriorly folded; dorsal fin present; dorsal-fin origin at a vertical between the centra of the 31st to 33rd vertebrae, anal-fin origin at a vertical between the centra of the 32nd and 33rd vertebrae; ventral projection on the hyomandibula articular facet for the opercle absent; parhypural posterior process length about half or slightly less of the length between the anterior margin of the parurohyal head and the proximal limit of the posterior process; ventral procurrent caudal-fin rays 31-36 (Ref. 137686). | |||
| Biology: | ||||
| IUCN Red List Status: | Not Evaluated (N.E.) Ref. (130435) | |||
| Threat to humans: | harmless | |||