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  • Aphanotorulus horrida
Jump to next section Cat-eLog Data Sheet
Scientific Name Aphanotorulus horrida  (Kner, 1854)
Common Names L290
L291
Type Locality Forte do Principe, Rio Guaporé, Brazil.
Synonym(s) Hypostomus horridus, Squaliforma horrida
Pronunciation ah FAN oh to RULE uss
Etymology Greek, aphanes = hidden + Latin, torulus, -i = muscle, little string. 
Jump to next section Species Information
Size 355mm or 14" SL. Find near, nearer or same sized spp.
Identification In Aphanotorulus, all species show clear sexual dimorphism and have a generally flatter appearance than other hypostomine genera. The posterior edge of the oral disc is jagged rather than smooth. Aphanotoroulus can be distinguished from Isorineloricaria by having caudal peduncles that do not become greatly lengthened with size and that are oval in cross section (vs. caudal peduncle proportions that get proportionately longer with size and that become round in cross-section), and by having small dark spots (less than half plate diameter) on a light tan background (vs. spots almost as large as lateral plates on a nearly white background.
Sexing Males in breeding condition posses extremely elongate, bristle-like odontodes. These cover the entire back and sides behind the dorsal fin.
Jump to next section Habitat Information
Distribution South America: Madeira River basin.
Amazon, Middle Amazon (Solimoes), Madeira, Aripuanã (click on these areas to find other species found there)
Amazon, Upper Amazon, Marañón, Morona (click on these areas to find other species found there)

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Jump to next section Husbandry Information
Breeding Unreported.
Breeding Reports There is no breeding report.
Jump to next section Further Information
References Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Classe. v. 7, pp 259, Pl. 1 (fig. 1).
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Last Update 2019 Jun 23 00:06 (species record created: 2002 Mar 10 00:00)