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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Megacohors: Osteoglossocephalai
Supercohors: Clupeocephala
Cohors: Otomorpha
Subcohors: Ostariophysi
Sectio: Otophysa
Ordo: Siluriformes

Familia: Loricariidae
Subfamiliae: Delturinae - Hypoptopomatinae - Hypostominae - Lithogeneinae - Loricariinae - Neoplecostominae - Otothyrinae

Overview of genera

Hirtella – Avalithoxus – Nannoplecostomus – Plesioptopoma – †Taubateia

Loricariidae Rafinesque, 1815 [96 genera, 716 species]

Loricaria Rafinesque, 1815: 89. Type genus: Loricaria Linnaeus, 1758.
Hypostomiden Kner, 1853b: 279. Type genus: Hypostomus La Cepède, 1803.
Ancistri Kner, 1854: 6. Type genus: Ancistrus Kner, 1854.
Acanthicini Bleeker, 1862 (in Bleeker, 1862–63): 2. Type genus: Acanthicus Spix & Agassiz, 1829.
Acestrini Bleeker, 1862 (in Bleeker, 1862–63): 4. Type genus: Acestra Kner, 1853. Permanently invalid, following Art. 39 of the Code, because the underlying generic name is preoccupied.
Hypoptopominae [sic, Hypoptopomatinae] Eigenmann & Eigenmann, 1890: 8, 12, 353, 388. Type genus: Hypoptopoma Günther, 1868.
Neoplecostominae Regan, 1904b: 306. Type genus: Neoplecostomus Eigenmann & Eigenmann, 1888.
Lithogeneinae [sic, for Lithogeninae] Gosline, 1947: 80. Type genus: Lithogenes Eigenmann, 1909.
Chaetostomidi Fowler, 1958: 14. Type genus: Chaetostomus Kner, 1846.
Farlowellidi Fowler, 1958: 14. Type genus: Farlowella Eigenmann & Eigenmann, 1889.
Harttiinae Boeseman, 1971: 4, 10. Type genus: Harttia Steindachner, 1877.
Acestridiinae Isbrücker & Nijssen, 1974a: 67, 68. Type genus: Acestridium Haseman, 1911.
Loricariichthyina Isbrücker, 1979a: 87, 89. Type genus: Loricariichthys Bleeker, 1862.
Metaloricariina Isbrücker, 1979a: 88, 90. Type genus: Metaloricaria, Isbrücker, 1975.
Hemiodontichthyina Isbrücker, 1979a: 88, 89. Type genus: Hemiodontichthys Bleeker, 1862.
Otocinclini Isbrücker, 1979b: 114. Type genus: Otocinclus Cope, 1871.
Planiloricariina Isbrücker, 1979a: 87, 89. Type genus: Planiloricaria Isbrücker, 1971.
Reganellina Isbrücker, 1979a: 87, 89. Type genus: Reganella Eigenmann, 1905.
Rineloricariina Isbrücker, 1979a: 87, 89. Type genus: Rineloricaria Bleeker, 1862.
Lithoxina Isbrücker, 1980: 77. Type genus: Lithoxus Eigenmann, 1910.
Pseudacanthicini Isbrücker, 1980: 76. Type genus: Pseudacanthicus Bleeker, 1862.
Ricolina Isbrücker, 1981: 54. Type genus: Ricola Isbrücker & Nijssen, 1978.
Hopliancistrini Isbrücker & Nijssen, 1989: 543. Type genus: Hopliancistrus Isbrücker & Nijssen, 1989.
Spectracanthicina Isbrücker & Nijssen, 1989: 544. Type genus: Spectracanthicus Nijssen & Isbrücker, 1987.
Otothyrini Schaefer, 1991: 31. Type genus: Otothyris Myers, 1927.
Lampiellini Isbrücker, in Isbrücker et al., 2001: 20. Type genus Lampiella Isbrücker, 2001.
Corymbophanini Armbruster, 2004a: 59. Type genus: Corymbophanes Eigenmann, 1909.
Pterygoplichthini [sic, for Pterygoplichthyini] Armbruster, 2004a: 61. Type genus: Pterygoplichthys Gill, 1858.
Rhinelepini Armbruster, 2004a: 61. Type genus: Rhinelepis Spix & Agassiz, 1829 [not Valenciennes, as stated in Armbruster].


Rafinesque, C.S. 1815. Analyse de la nature, ou tableau de l'univers et des corps organisés. Palerme: L'Imprimerie de Jean Barravecchia. 224 pp. BHL Reference page. 
Armbruster, J.W. & D.C. Taphorn, 2011: A New Genus and Species of Weakly Armored Catfish from the Upper Mazaruni River, Guyana (Siluriformes: Loricariidae). Copeia 2011 (1): 46–52.
Chiachio et al., 2008, Molecular systematic and historical biogeography of the armored Neotropical catfishes Hypoptopomatinae and Neoplecostominae (Siluriformes: Loricariidae). Molecular Phylogenetics and Evolution 49, pp. 606–617.
Ferraris, C.J., Jr. 2007: Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa, 1418: 1–628. pdf
Ribeiro, A.C., Lima, F.C.T. & Pereira, E.H.L. 2012: A New Genus and Species of a Minute Suckermouth Armored Catfish (Siluriformes: Loricariidae) from the Rio Tocantins Drainage, Central Brazil: The Smallest Known Loricariid Catfish. Copeia, 2012 (4): 637–647.
Silva, G.S.C., Roxo, F.F., Orrego, L.E. & Oliveira, C. 2016. Description of a new catfish genus (Siluriformes, Loricariidae) from the Tocantins River basin in central Brazil, with comments on the historical zoogeography of the new taxon. ZooKeys 598: 129-157. DOI: 10.3897/zookeys.598.7400. Reference page. 
Salcedo, N.J. 2013: Description of Loraxichthys lexa, new genus and species (Siluriformes: Loricariidae) from the Río Huallaga Basin, central Peru, with notes on the morphology of the enigmatic Lipopterichthys carrioni Norman, 1935. Zootaxa 3640(4): 557–571. DOI: 10.11646/zootaxa.3640.4.4 Reference page. 


Loricariidae and its species in FishBase,
Froese, R. & Pauly, D. (eds.) 2023. FishBase. World Wide Web electronic publication,, version 06/2022.
Genera of Loricariidae (including synonyms) in Catalog of Fishes, Eschmeyer, W.N., Fricke, R. & van der Laan, R. (eds.) 2023. Catalog of Fishes electronic version.
WoRMS (2010). Loricariidae. In: Nicolas Bailly (2010). FishBase. Accessed through: World Register of Marine Species at on 2012-08-06

Vernacular names
English: Sucker Catfish, Armored Catfish
日本語: ロリカリア科
português: cascudo, acari, cari, uacari, boi-de-guará
ไทย: ปลาซัคเกอร์, ปลากดเกราะ, ปลาเทศบาล, ปลาดูด

Loricariidae is the largest family of catfish (order Siluriformes), with 92 genera and just over 680 species.[3] Loricariids originate from freshwater habitats of Costa Rica, Panama, and tropical and subtropical South America. These fish are noted for the bony plates covering their bodies and their suckermouths. Several genera are sold as "plecos", notably the suckermouth catfish, Hypostomus plecostomus, and are popular as aquarium fish.

Common names

Members of the family Loricariidae are commonly referred to as loricariids, suckermouth armoured catfishes, or armoured catfish.[4] The name "plecostomus", and its shortened forms "pleco" and "plec", are used for many Loricariidae, since Plecostomus plecostomus (now called Hypostomus plecostomus) was one of the first loricariid species imported for the fish-keeping hobby.[5]

Some loricariids are not normally considered "plecostomus", such as Farlowella catfish.

In their native range, these fish are known as cascudos or acarís.[6]
Main article: L-number

Some types of loricariids are often referred to by their 'L-number'; this has become common since imports of loricariid catfish from South America often included specimens that had not been taxonomically described. Currently, L-numbers are used not only by fish-keeping enthusiasts, but also by biologists, since they represent a useful stopgap until a new species of fish is given a full taxonomic name.[7] In some cases, two different L-numbered catfish have turned out to be different populations of the same species, while in other cases, multiple (but superficially similar) species have all been traded under a single L-number.[citation needed]
Taxonomy and evolution

Because of their highly specialized morphology, loricariids have been recognized as a monophyletic assemblage in even the earliest classifications of the Siluriformes, meaning they consist of a natural grouping with a common ancestor and all of its descendants.[8] Loricariidae is one of seven families in the superfamily Loricarioidea, along with Amphiliidae, Trichomycteridae, Nematogenyidae, Callichthyidae, Scoloplacidae, and Astroblepidae. Some of these families also exhibit suckermouths or armor, although never in the same individual, as in loricariids.[4]

This is the largest catfish family, including about 684 species in around 92 genera, with new species being described each year.[4] However, this family is in flux, and revisions are likely.[4] For example, the subfamily Ancistrinae is accepted as late as the 2006 edition of Nelson's Fishes of the World; it later becomes grouped as a tribe, because of its recognition as a sister group to the Pterygoplichthyini.[4][6][9] Under Ambruster, six subfamilies are recognized: Delturinae, Hypoptopomatinae, Hypostominae, Lithogeneinae, Loricariinae, and Neoplecostominae.[9][10]

Monophyly for the family is strongly supported, except, possibly, the inclusion of Lithogenes.[11] Lithogenes is the only genus within the subfamily Lithogeneinae. This genus and subfamily, the most basal group in Loricariidae, is the sister group to the rest of the family.[12] Neoplecostominae are the most basal group among the loricariids with the exception of Lithogeneinae.[13] However, the genera of Neoplecostominae do not appear to form a monophyletic assemblage.[14] The two subfamilies Loricariinae and Hypoptopomatinae appear to be generally regarded as monophyletic. However, the monophyly and composition of the other subfamilies are currently being examined and will likely be altered substantially in the future.[11] The Hypostominae are the largest subfamily of Loricariidae. It is made up of five tribes. Four of the five tribes, Corymbophanini, Hypostomini, Pterygoplichthyini, and Rhinelepini, include about 24 genera. The fifth and largest tribe, Ancistrini (formerly recognized as its own subfamily), includes 30 genera.[15]

Loricariid fossils are extremely rare.[16] The fossil record of Loricariidae extends back to the upper Miocene.[1] Within the superfamily Loricarioidea, the Loricariidae are the most derived; in this superfamily, the trend is toward increasingly complex jaw morphology, which may have allowed for the great diversification of the Loricariidae, which have the most advanced jaws.[17]
Distribution and habitat

The family Loricariidae is vastly distributed over both the east and west sides of the Andes mountains, however, most species are generally restricted to small geographic ranges.[18] They are primarily found in freshwater habitats of South America, but several loricariines and hypostomines are native to Panama, and two species (Fonchiiichthys uracanthus and Hemiancistrus aspidolepis) are native to Costa Rica.[19] Species occur in swift-flowing streams from the lowlands up to 3,000 m (9,800 ft) in elevation.[4] They can also be found in a variety of other freshwater environments.[5] They can be found in torrential mountain rivers, quiet brackish estuaries, black acidic waters, and even in subterranean habitats.[8]
Description and biology

This family has extremely variable color patterns and body shapes.[8] Loricariids are characterized by bony plates covering their bodies, similar to the bony plates in callichthyids. (In Latin, lorica means corselet).[20] These fish exhibit a ventral suckermouth, with papillae (small projections) on the lips. When present, the adipose fin usually has a spine at the forward edge.[4] These fish have, when they are present, a unique pair of maxillary barbels.[4][8] These fish have relatively long intestines due to their usually herbivorous or detrivorous diets.[4] The body is characteristically flattened in this family.[8] Taste buds cover almost the entire surface of the body and fin spines.[21] Body lengths can range from 2.22 cm (0.87 in) in Nannoplecostomus eleonorae to over 100 cm (39 in) in Panaque, Acanthicus, and Pterygoplichthys.[18]

One of the most obvious characteristics of the loricariids is the suckermouth. The modified mouth and lips allow the fish to feed, breathe, and attach to the substrate through suction. The lips were once believed to be unable to function as a sucker while respiration continued, as the inflowing water would cause the system to fail; however, respiration and suction can function simultaneously. Inflowing water passing under the sucker is limited to a thin stream immediately behind each maxillary barbel; the maxillae in loricariids support only small maxillary barbels and are primarily used to mediate the lateral lip tissue in which they are embedded, preventing failure of suction during inspiration[vague]. To achieve suction, the fish presses its lips against the substrate and expands its oral cavity, causing negative pressure.[22]

Also, unlike most other catfishes, the premaxillae are highly mobile, and the lower jaws have evolved towards a medial position, with the teeth pointed rostroventrally; these are important evolutionary innovations.[17] The fish rotates its lower and upper jaws to scrape the substrate. Of the two, the lower jaws are more mobile.[22]

Loricariid catfishes have evolved several modifications of their digestive tracts that function as accessory respiratory organs or hydrostatic organs. These complex structures would have been independently evolved a number of times within the family. This includes an enlarged stomach in the Pterygoplichthyini, Hypostomus, and Lithoxus, a U-shaped diverticulum in Rhinelepini, and a ring-like diverticulum in Otocinclus. It may be noted that even loricariids with unmodified stomachs have a slight ability to breathe air.[23]

Considerable sexual dimorphism occurs in this family, most pronounced during the breeding season. For example, in Loricariichthys, the male has a large expansion of its lower lip, which it uses to hold a clutch of eggs.[21] Ancistrus males have snouts with fleshy tentacles.[21] In loricariids, odontodes develop almost anywhere on the external surface of the body and first appear soon after hatching; odontodes appear in a variety of shapes and sizes and are often sexually dimorphic, being larger in breeding males.[21] In most Ancistrini species, sharp evertible cheek spines (elongated odontodes) are often more developed in males and are used in intraspecific displays and combat.[21]
Omega iris
The omega iris allows loricariids to adjust the amount of light that enters their eye.

Unusual for bony fish, many species have a modified iris called an omega iris. The dorsal segment of the iris expands downward over the pupil to form a loop which can expand and contract, called an iris operculum; when light levels are high, the pupil reduces in diameter and the loop expands to cover the center of the pupil, giving rise to a crescent-shaped, light-transmitting partial pupil.[24] This feature gets its name from its similarity to an upside-down uppercase Greek letter omega (Ω). The origins of this structure are unknown, but breaking up the outline of the highly visible eye has been suggested to aid camouflage in what are often highly mottled animals.[24] Species in the tribe Rhinelepini are an exceptional group among loricariids, having a circular iris.[25] The presence or absence of the iris operculum can be used for identification of species in the subfamily Loricariinae.[8]

As of 2000, only 56 loricariid species have been cytogenically investigated.[6] The basal diploid number of chromosomes is 2n = 54 in this family,[26] but with a wide variation in the chromosome number in this fish group, ranging from 2n = 36 in the Loricariinae, Rineloricaria latirostris, to 2n = 96 in a species of Upsilodus (Hemipsilichthys).[26] Most members of the Ancistrini and Pterygoplichthyini have 52 chromosomes.[6] Karyotypic evolution by means of centric fusions and centric fissions seems to be a common feature among loricariids; this is demonstrated by a higher number of biarmed chromosomes in species with lower diploid number and many uniarmed chromosomes in species with higher diploid numbers.[27] Studies conducted with representatives of some genera of Hypostominae showed, within this group, the diploid number ranges from 2n = 52 to 2n = 80. However, the supposed wide karyotypic diversity the family Loricariidae or the subfamily Hypostominae would present is almost exclusively restricted to the genus Hypostomus, and the species from the other genera had a conserved diploid number.[13] In some species, there is a ZZ/ZW sex-determination system.[6][27]
Panaque nigrolineatus attached to a piece of wood

The suckermouth exhibited by these catfish allows them to adhere to objects in their habitats, even in fast-flowing waters.[8] The mouth and teeth also are adapted to feed on a variety of foods, such as algae, invertebrates, and detritus.[8] Some species, notably the Panaque, are known for xylophagy, or the ability to digest wood.[28]

Most species of loricariids are nocturnal animals. Some species are territorial, while others, such as Otocinclus, prefer to live in groups.[5]

Air-breathing is well known among many loricariids; this ability is dependent on the risk of hypoxia faced by a species; torrent-dwelling species tend to have no ability to breathe air, while low-land, pool-dwelling species, such as those of Hypostomus, have a great ability to breathe air.[23] Pterygoplichthys is known for being kept out of water and sold alive in fish markets, surviving up to 30 hours out of water.[23] Loricariids are facultative air breathers; they will only breathe air if under stress and will only use their gills in situations when oxygen levels are high. The dry season is a likely time for this; there would be little food in the stomach, which would allow its use for air breathing.[23]

Loricariids exhibit a wide range of reproductive strategies, including cavity spawning, attachment of eggs on the underside of rocks, and egg-carrying.[21] Parental care is usually good, and the male guards the eggs and sometimes the larvae.[21] The eggs hatch after four to 20 days, depending on the species.[5]

Three species known from subterranean habitats are true troglobites with reduced pigmentation (appearing overall whitish) and eyes: Ancistrus cryptophthalmus, A. galani and A. formoso.[29][30][31] Similar adaptions with reduced pigmentation are known from two loricariids found in deep water in large Amazonian rivers, Peckoltia pankimpuju and Panaque bathyphilus.[32]
In the aquarium
Pterygoplichthys multiradiatus, often sold as a common pleco, is an aquarium fish often purchased as an algae eater.

Loricariids are popular aquarium fish, where they are often sold as "plecs", "plecos" or "plecostomus".[4] These fish are often purchased because of their algae-eating habits, though this role may not be carried out.[5] Loricariid are either vegetarian, omnivore, carnivore or wood-eaters.[33] A great many species of loricariids are also sold for their ornamental qualities, representing many body shapes and colors.

Most species of loricariids are nocturnal and will shy away from bright light, appreciating some sort of cover to hide under throughout the day. As they often originate from habitats with fast-moving water, filtration should be vigorous.[5]

A number of species of loricariids have been bred in captivity.[5]

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Covain, Raphael; Fisch-Muller, Sonia (2007). "The genera of the Neotropical armored catfish subfamily Loricariinae (Siluriformes: Loricariidae): a practical key and synopsis" (PDF). Zootaxa. 1462: 1–40. doi:10.11646/zootaxa.1462.1.1. Retrieved 2009-06-23.
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Reis, Roberto E.; Pereira, Edson H.L.; Armbruster, Jonathan W. (2006). "Delturinae, a new loricariid catfish subfamily (Teleostei, Siluriformes), with revisions of Delturus and Hemipsilichthys". Zoological Journal of the Linnean Society. 147 (2): 277–299. doi:10.1111/j.1096-3642.2006.00229.x.
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Schaefer, Scott A. (2003). "Relationships of Lithogenes villosus Eigenmann, 1909 (Siluriformes, Loricariidae): Evidence from High-Resolution Computed Microtomography" (PDF). American Museum Novitates. American Museum of Natural History (3401): 1–55. doi:10.1206/0003-0082(2003)401<0001:ROLVES>2.0.CO;2. hdl:2246/2827. S2CID 36180254.
Alves, Anderson Luís; Oliveira, Claudio; Foresti (2005). "Comparative cytogenetic analysis of eleven species of subfamilies Neoplecostominae and Hypostominae (Siluriformes: Loricariidae)". Genetica. 124 (2–3): 127–136. doi:10.1007/s10709-004-7561-4. PMID 16134327. S2CID 8239240.
Pereira, Edson H. Lopes (2005). "Resurrection of Pareiorhaphis Miranda Ribeiro, 1918 (Teleostei: Siluriformes: Loricariidae), and description of a new species from the Rio Iguaçu basin, Brazil". Neotropical Ichthyology. 3 (2): 271–276. doi:10.1590/S1679-62252005000200004.
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Malabarba, Maria Claudia; Lundberg, John G. (2007). "A fossil loricariid catfish (Siluriformes: Loricarioidea) from the Taubaté Basin, eastern Brazil". Neotropical Ichthyology. 5 (3): 263–270. doi:10.1590/S1679-62252007000300005.
Schaefer, Scott A.; Lauder, George V. (1986). "Historical Transformation of Functional Design: Evolutionary Morphology of Feeding Mechanisms in Loricarioid Catfishes". Systematic Zoology. Society of Systematic Biologists. 35 (4): 489–508. doi:10.2307/2413111. JSTOR 2413111. S2CID 86178220.
Quevedo, Rodrigo; Reis, Roberto E. (2002). Schaefer, S. A. (ed.). "Pogonopoma obscurum: A New Species of Loricariid Catfish (Siluriformes: Loricariidae) from Southern Brazil, with Comments on the Genus Pogonopoma" (PDF). Copeia. 2002 (2): 402–410. doi:10.1643/0045-8511(2002)002[0402:POANSO]2.0.CO;2. S2CID 85769730.
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Sabaj, Mark H.; Armbruster, Jonathan W.; Page, Lawrence M. (1999). "Spawning in Ancistrus (Siluriformes: Loricariidae) with comments on the evolution of snout tentacles as a novel reproductive strategy: larval mimicry" (PDF). Ichthyol. Explor. Freshwaters. 10 (3): 217–229. Retrieved 2009-06-23.
Geerinckx, Tom; Brunain, Marleen; Herrel, Anthony; Aerts, Peter; Adriaens, Dominique (January 2007). "A head with a suckermouth : a functional-morphological study of the head of the suckermouth armoured catfish Ancistrus cf. triradiatus (Loricariidae, Siluriformes)" (PDF). Belg. J. Zool. 137 (1): 47–66. Archived from the original (PDF) on 2007-09-27. Retrieved 2007-07-24.
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Douglas, Ron H.; Collin, Shaun P.; Corrigan, Julie (2002-11-15). "The eyes of suckermouth armoured catfish (Loricariidae, subfamily Hypostomus): pupil response, lenticular longitudinal spherical aberration and retinal topography" (PDF). Journal of Experimental Biology. The Journal of Experimental Biology. 205 (22): 3425–3433. doi:10.1242/jeb.205.22.3425. PMID 12364396.
Armbruster, Jonathan W. (1998). "Phylogenetic Relationships of the Suckermouth Armored Catfishes of the Rhinelepis Group (Loricariidae: Hypostominae)". Copeia. 1998 (3): 620–636. doi:10.2307/1447792. JSTOR 1447792.
Artoni, Roberto Ferreira; Bertollo, Luiz Antonio Carlos (2001). "Trends in the karyotype evolution of Loricariidae fish (Siluriformes)". Hereditas. 134 (3): 201–210. doi:10.1111/j.1601-5223.2001.00201.x. PMID 11833282.
Kavalco, KF; Pazza, R; Bertollo, LAC; Moreira-Filho, O (2005). "Karyotypic diversity and evolution of Loricariidae (Pisces, Siluriformes)" (PDF). Heredity. 94 (2): 180–186. doi:10.1038/sj.hdy.6800595. PMID 15562288. S2CID 6149247. Retrieved 2009-06-23.
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Romero, A., editor (2001). The Biology of Hypogean Fishes. Developments in Environmental Biology of Fishes. ISBN 978-1402000768
Sabino, J., and E. Trajano (1997). A new species of blind armoured catfish, genus "Ancistrus", from caves of Bodoquena region, Mato Grosso do Sul, southwestern Brazil (Siluriformes, Loricariidae, Ancistrinae). Revue française d'Aquariologie Herpétologie 24(3-4): 73–78
Trajano, E (2001). "Habitat and population data of troglobitic armored cave catfish, Ancistrus cryptophthalmus Reis, 1987, from central Brazil (Siluriformes: Loricariidae)". Environmental Biology of Fishes. Developments in environmental biology of fishes. 62: 195–200. doi:10.1007/978-94-015-9795-1_14. ISBN 978-90-481-5848-5.
Lujan, N.K., and C. Chamon (2008). Two new species of Loricariidae (Teleostei: Siluriformes) from main channels of the upper and middle Amazon Basin, with discussion of deep water specialization in loricariids. Ichthyological Exploration of Freshwaters. 19: 271–282.
"Feeding Plecos, Part 2 • Who eats what?". Retrieved 2022-02-11.

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