Labeoninae

Labeoninae is a doubtfully distinct subfamily of ray-finned fishes in the family Cyprinidae of order Cypriniformes. They inhabit fresh water and the largest species richness is in the region around southern China, but there are also species elsewhere in Asia, and some members of Garra and Labeo are from Africa. They are a generally very apomorphic group, perhaps the most "advanced" of the Cyprinidae. A common name for these fishes is labeonins (when considered a distinct subfamily) or labeoins (when included in subfamily Cyprininae).

Labeoninae
Cambodian logsucker (Garra cambodgiensis)
Also known as "False Siamese algae eater"
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Subfamily: Labeoninae
Bleeker, 1859
Diversity
Around 30 genera (but see text)
Synonyms

Garrinae
Labeonini (but see text)

They include the group sometimes separated as Garrinae, but these do not seem to be that distinct. In fact, the entire Labeoninae is merged into the Cyprininae by a number of authors; in any case, these two and the former "Barbinae" form a close-knit group whose internal phylogeny is far from resolved. If the subfamily is considered distinct, it is typically split in the tribes Labeonini (which are able to swim well in open water) and Garrini (which are mostly benthic), and sometimes in addition the Banganini (which are somewhat intermediate in habitus) If the labeo lineage is included in the Cyprininae, it becomes the tribe Labeonini, while its two (or three) subdivisions are the subtribes Labeoina, Garraina and perhaps Banganina.[1]

Notable genera are Crossocheilus, Epalzeorhynchos and Garra, which contain some of the popular aquarium fishes often called "algae eaters", e.g. the Siamese algae-eater (Crossocheilus siamensis). Labeo – the type genus of this subfamily – contains many sizeable species which are often used as food.

Anatomically, the labeonins are distinguished by the Weberian apparatus contacting the skull with the supraneural bones, and its basioccipital process being concave in cross-section. The first vertebra has a parapophysis that is elongated to forward and partially overlaps the basioccipital process. The fourth vertebra, meanwhile, has a short but stout transverse process that is prominently elongated bellywards; the os suspensorium is often hidden behind if viewed from the side. In the skull, the frontal and sphenotic bones have prominent foramina. In the anal fin, the first pterygiophore is elongated and has well-developed anterior and posterior flanges, with the former very large and concave at the distal end. Most labeonins have the skinny flap of the underside of the snout well-developed into a fleshy cap that at least partially hides the upper lip except when feeding, and a similar structure at the lower lip.[2]

Genera

The supposed genus "Tylognathus", commonly placed in the Labeonini (or Labeoina), is actually a polyphyletic assemblage containing diverse labeonins and some other cyprinids. Its type species, variously called "Tylognathus diplostoma" or "Tylognathus valenciennesii", is actually Bangana diplostoma; most of its other species are now in Lobocheilos.

Footnotes
  1. de Graaf et al. (2007), Stiassny & Getahun (2007), He et al. (2008)
  2. Stiassny & Getahun (2007)
  3. Zheng, L.-P., Chen, X.-Y. & Yang, J.-X. (2016): Molecular systematics of the Labeonini inhabiting the karst regions in southwest China (Teleostei, Cypriniformes). ZooKeys, 612: 133–148.
  4. Nguyen, V.H., Nguyen, H.D. & Nguyen, T.D.P. (2016): Vinalabeo, a new generic name for Vinalabeo tonkinensis (Cyprinidae, Teleostei). Journal of Science of Hnue, Natural Sciences, 61 (9): 140-144.
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References
  • de Graaf, Martin; Megens, Hendrik-Jan; Samallo, Johannis & Sibbing, Ferdinand A. (2007): Evolutionary origin of Lake Tana's (Ethiopia) small Barbus species: indications of rapid ecological divergence and speciation. Anim. Biol. 57(1): 39-48. doi:10.1163/157075607780002069 (HTML abstract)
  • He, Shunping; Mayden, Richard L.;Wang, Xuzheng; Wang, Wei; Tang, Kevin L.; Chen, Wei-Jen & Chen, Yiyu (2008): Molecular phylogenetics of the family Cyprinidae (Actinopterygii: Cypriniformes) as evidenced by sequence variation in the first intron of S7 ribosomal protein-coding gene: Further evidence from a nuclear gene of the systematic chaos in the family. Mol. Phylogenet. Evol. 46(3): 818–829. doi:10.1016/j.ympev.2007.06.001 PDF fulltext
  • Stiassny, Melanie L.J. & Getahun, Abebe (2007): An overview of labeonin relationships and the phylogenetic placement of the Afro-Asian genus Garra Hamilton, 1922 (Teleostei: Cyprinidae), with the description of five new species of Garra from Ethiopia, and a key to all African species. Zool. J. Linn. Soc. 150(1): 41-83. doi:10.1111/j.1096-3642.2007.00281.x PDF fulltext
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