AquaticRepublic.com - Ageneiosus lineatus (Auchenipteridae) All Fishes

All Fishes Data Sheet
Scientific Name	**Ageneiosus lineatus** Ribeiro, Rapp Py-Daniel & Walsh, 2017
Common Name
Type Locality	Rio Negro, Rio Jaú, Novo Airã, Amazonas, Brazil.
Pronunciation	ah genie OH sus
Etymology	Ageneiosus, from the Greek a, meaning without and genias, meaning beard in reference to the apparent lack of barbels. In fact, catfish of this genus have very short maxillary barbels that are almost indistinguishable to the human eye.
Species Information
Identification	Ageneiosus differs from other Auchenipteridae, except Tympanopleura, by having: 1, long bony process, narrowing distally on anterolateral border of sphenoid; 2, longitudinal groove on posterior margin of anterior fontanel (also present in Pseudepapterus); 3, dorsal portion of posttemporal-supracleithrum divided into two prominent branches; 4, internal and external processes of epioccipital sutured to parapophyses of fifth and sixth vertebrae; 5, bony process on posteromedial border of first infraorbital bone (also present in Tetranematichthys); 6, anterior or posterior region of second infra-orbital very curved; 7, bony expansion on laterodorsal margin of premaxilla; 8, operculum with spongy ossification; 9, bone projections on posterior extreme of the parurohyal; 10, seventh vertebra not fused to complex vertebrae (also present in Pseudepapterus); 11, well-developed crown of spines in proximal region of anterior margin of dorsal-fin spine of mature males; 12, short maxillary barbel, not extending posteriorly beyond snout (also present in Tetranematichthys); 13, mental barbels absent; 14, bony spines on maxillary barbel of mature males; 15, posterior lobes of testes reduced or absent (also present in Auchenipterus). Ageneiosus differs from Tympanopleura by having: 1, reduced and completely ossified gas bladder in adults, except Ageneiosus pardalis Lütken 1874 (v. large, non-ossified gas bladder during all phases of ontogenetic development); 2, posterior diverticula on the gas bladder absent (v. having paired posterior diverticula on the gas bladder, except T. piperata); 3, epaxial muscles almost completely covering the tympanic region in adults, except A. pardalis (v. tympanic region translucent, not covered by epaxial muscles); 4, dorsal process on the base of pectoral fin weakly developed, loosely articulating with cleithrum (v. dorsal process on the base of pectoral fin well developed, strongly articulating with cleithrum); 5, fenestra on the lateral wall of cleithrum (v. lateral wall of cleithrum completely ossified). A key to the species of Ageneiosus is located here. This species is commonly misidentified as A. vittatus. This species has a much more flattened head (A. vittatus' head looks more rounded like A. magoi). This specioes lacks the typical higher contrast mottled colouration of A. vittatus (similarity in pattern is said to be superficial) and lacks the two very prominent caudal fin spots (one on each lobe) of A. vittatus.
Sexing	Like all Auchenipterids, males have a genital papilla. Moreover, sexually active males get an enlarged and slightly curved dorsal spine and thickened barbels, that are used to clasp the female. After the breeding season, the dorsal spine and the barbels grow back to their normal sizes.
General Remarks	One of the smaller ageneiosids.
Habitat Information
Distribution	Amazon, Middle Amazon (Solimoes), Negro (click on these areas to find other species found there) Log in to view data on a map.
IUCN Red List Category	Least Concern, range map and more is available on the IUCN species page. Last assessed 2020.
Husbandry Information
Breeding	Unreported in the aquarium.
Breeding Reports	There is no breeding report.
Further Information
Reference	Journal of Fish Biology, pp 40, Fig. 15.
Registered Keepers	There is no registered keeper.
Wishlists	Love this species? Click the heart to add it to your wish list. There is no wish to keep this species.
Spotters	Spotted this species somewhere? Click the binoculars! There are 5 records of this fish being seen, view them all.
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Last Update	2020 Jul 25 11:42 (species record created: 2001 Nov 05 00:00)