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  • Aphanotorulus horridus
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Scientific Name Aphanotorulus horridus    (Kner, 1854)
Common Names L290, Long Head Pleco
L291, Langhoved-sugemalle (Denmark)
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. 
Hop 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.
Hop 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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IUCN Red List Category
Least Concern
, range map and more is available on the IUCN species page. Last assessed 2022.
Hop to next section Husbandry Information
Breeding Unreported.
Breeding Reports There is no breeding report.
Hop to next section Further Information
Reference 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 2025 Jan 02 01:40 (species record created: 2002 Mar 10 00:00)