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Scientific Name Ageneiosus uranophthalmus  Ribeiro & Rapp Py-Daniel, 2010
Common Name
Type Locality Rio Amazonas below Paraná da Eva, ca. 3°13'S, 59°01'W, Itacoatiara, Amazonas State, 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. 
Down arrow Species Information
Size 230mm or 9.1" SL. Find near, nearer or same sized spp.
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).

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Sexing Observed in nuptial males. Predorsal profile distinctly more acutely angled upward than in females, juveniles and non-nuptial males. Maxillary barbel entirely ossified, forming a rigid, thickened, elongate barbel that may reach beyond the anterior eye margin when adpressed to the side of the head. Two rows of sharp recurved hooks on dorsal margin of barbel. Articular surface of maxilla expanded for contact with autopalatine. Dorsal-fin spine elongate, rigid, aculeiform, straight to strongly arched. Anterior margin of the dorsal-fin spine with pungent, unicuspid serrae, closely spaced proximally, recurved laterally, forming an enlarged, ossified protuberance at the anterior base of the spine; serrae distally arranged in a row, sometimes absent along middle quarter to third of spine. Dorsal-fin spine of nuptial males may be hyperextended anteriorly to approximately a 45∘ dorso-anterior angle, instead of the near-vertical limit of females and juveniles. The first branched dorsal-fin ray is much longer than in non-breeding males and females. Unbranched and first few branched anal-fin rays thickened and elongate to form a tubular intromittent organ bound by integument to the anterior margin of the anal fin. Urogenital opening of nuptial male displaced as a simple pore at the distal tip of intromittent organ.
Down arrow Habitat Information
Distribution Middle reaches of Amazon River Basin, Brazil.
Amazon, Middle Amazon (Solimoes) (click on these areas to find other species found there)

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IUCN Red List Category Not Evaluated
Down arrow Husbandry Information
Breeding Unreported.
Breeding Reports There is no breeding report.
Down arrow Further Information
Reference Neotropical Ichthyology v. 8 (no. 1), pp 98, Figs. 1-2.
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Last Update 2019 Sep 29 02:43 (species record created: 2003 Oct 08 00:00)