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Acanthicus Scientific classification Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Siluriformes Family: Loricariidae Subfamily: Hypostominae Tribe: Ancistrini Genus: Acanthicus Agassiz in Spix & Agassiz, 1829 Type species Acanthicus hystrix Spix & Agassiz, 1829 Species Acanthicus adonis Acanthicus hystrix Acanthicus is a genus of catfishes (order Siluriformes) of the family Loricariidae. It includes two species, A. adonis and A. hystrix.[1] The name Acanthicus is derived from the Greek, akanthikos meaning thorny, spiny.[2] Fish of this genus are known as Lyre tail plecos.[3][4] A. hystrix may also be known as L155 by the L-number system.[3] Contents 1 Distribution 2 Description 3 Ecology 4 In the aquarium 5 References Distribution They are native to the Amazon and Orinoco rivers of South America and possibly in Guyana.[5] A. adonis is from the lower Tocantins River basin in Brazil while A. hystrix is from the Amazon River basin.[1] Description Acanthicus are large species that may grow up to 1 metre (39 in).[5] A. adonis grows up to about 20.6 centimetres (8.11 in) SL, but are also reported to grow much larger to 100 cm (39 in) SL.[6][4] A. hystrix has a maximum recorded length of about 53.0 cm (20.8 in) SL but is reported to grow up to 70 cm (28 in) TL.[7] These fish are relatively slender, spiny Loricariids that lack an adipose fin. The caudal fin possesses long filamentous lobes on the upper and lower margins and is forked. The pectoral fin spines are extremely long. The entire dorsal surface of the head is covered in stout, sharp odontodes. The odontodes form a sharp keel on the lateral plates and, in juveniles, there are few to no odontodes on the plates above and below the keel rows. The cheek odontodes are fairly thin, but numerous. Males may have more and longer cheek odontodes and greatly elongated odontodes on the pectoral fin spine.[5] The colour of these fish is typically black, sometimes gray, with the abdomen the same color as the rest of the body.[5] A. adonis shows white spots on a black background in juveniles; the adults lack these whie spots, but are pitch black, unlike other Acanthicus species.[4] Ecology Acanthicus species are found in large rivers.[5] Fish of this genera are omnivorous, juveniles feed on algae and aufwuchs.[citation needed] In the aquarium A. adonis is an ornamental fish in the aquarium fishkeeping hobby. It is a generalist or opportunist feeder and will accept most kinds of fish food. Objects in the aquarium should be stable so that they are not knocked over by these fish. These fish are rather territorial and must be kept in a large aquarium with many refuges; care should be taken when keeping these fish with other loricariids as this has been known to result in death of one or both fish. They require well-filtered water. They have been bred in captivity.[4] References ^ a b Ferraris, Carl J., Jr. (2007). "Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types" (PDF). Zootaxa 1418: 1–628. http://silurus.acnatsci.org/ACSI/library/biblios/2007_Ferraris_Catfish_Checklist.pdf. Retrieved 2009-06-25.  ^ Froese, Rainer, and Daniel Pauly, eds. (2007). Species of Acanthicus in FishBase. July 2007 version. ^ a b "PlanetCatfish::Cat-eLog::Loricariidae::Acanthicus hystrix". 2006-08-13. http://www.planetcatfish.com/catelog/species.php?species_id=217. Retrieved 2007-07-21.  ^ a b c d "PlanetCatfish::Cat-eLog::Loricariidae::Acanthicus adonis". 2007-05-03. http://www.planetcatfish.com/catelog/species.php?species_id=277. Retrieved 2007-07-21.  ^ a b c d e Armbruster, Jonathan W.. Acanthicus (Spix, 1829). http://www.auburn.edu/academic/science_math/res_area/loricariid/fish_key/Acanth/acansub.html. Retrieved 2007-07-21.  ^ Froese, Rainer, and Daniel Pauly, eds. (2007). "Acanthicus adonis" in FishBase. July 2007 version. ^ Froese, Rainer, and Daniel Pauly, eds. (2007). "Acanthicus hystrix" in FishBase. July 2007 version.