Hypostomus yaku

Hypostomus yaku is a species of South American armoured catfish from the family Loricariidae. It is only known from the Rio Quente, a small thermal stream in the Rio Paranaíba drainage of the upper Paraná basin, Brazil.[1] H. yaku is unusual when compared to other species of Hypostomus in that it tolerates warm water up to 34 °C and only attains a relatively small size, growing to 70.8 mm SL.[1]

Hypostomus yaku
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Loricariidae
Subfamily: Hypostominae
Tribe: Hypostomini
Genus: Hypostomus
Species:
H. yaku
Binomial name
Hypostomus yaku
Martins, Langeani & Zawadzki, 2014

Taxonomy

H. yaku can be distinguished from the other members of Hypostomus, some 140 plus species,[2] by the presence, in mature adults, of hypertrophied odontodes arranged randomly along its flanks and caudal peduncle.[1] This characteristic is also found in species of other Hypostominae genera, Aphanotorulus, Peckoltia and Squaliforma, but can be distinguished by several keys (see Martins et al. 2014).[1] H. yaku is most similar to two other species found in the same region, H. nigromaculatus and H. paulinus, but can differentiated by a lack of dark spots (versus presence in H. nigromaculatus)[3] and by smaller adult size (70.8mm SL versus 135mm SL in H. paulinus).[1]

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References
  1. Martins, F.O.; Langeani, F. & Zawadzki, C.H. (2014). "A new spiny species of Hypostomus Lacépède (Loricariidae: Hypostominae) from thermal waters, upper rio Paraná basin, central Brazil" (PDF). Neotropical Ichthyology. 12 (4): 729–736. doi:10.1590/1982-0224-20140035. Archived from the original (PDF) on 2014-12-31.
  2. Eschmeyer, W. N. "Catalog of Fishes". California Academy of Sciences. Retrieved 3 January 2015.
  3. Ito, K.F.; Renesto, E. & Zawadzki, C.H. (2009). "Biochemical comparison of two Hypostomus populations (Siluriformes, Loricariidae) from the Atlântico Stream of the upper Paraná River basin, Brazil". Genetics and Molecular Biology. 32 (1): 51–57. doi:10.1590/s1415-47572009000100008. PMC 3032963.


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