Bibarba parvoculus

Bibarba parvoculus is a cave-dwelling species of loach endemic to a karst cave in Guangxi in southern China.[1][2] Its only known congener (an organism within the same genus) is the surface-dwelling Bibarba bibarba, from which it is believed to have evolutionarily split in the Early Miocene.[3][4]

Bibarba parvoculus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cobitidae
Genus: Bibarba
Species:
B. parvoculus
Binomial name
Bibarba parvoculus
Wu, Yang & Xiu, 2015

Description

B. parvoculus is a troglobitic species with a depigmented body and reduced eyes.[4] Males display a duplication of the lamina circularis on the second and third pectoral rays. The coracoid, mesocoracoid, and scapula are stouter in males, with the three bones being autogenous (that is, unfused), in contrast to Bibarba bibarba where these bones are fused with the cleithrum.[4] It also differs from B. bibarba, by having a higher number of vertebrae, a broader anterior part of the frontal bone at the orbital region, and decreased sexual dimorphism.[4]

References
  1. Froese, Rainer; Pauly, Daniel (eds.) (2006). "Bibarba parvoculus" in FishBase. April 2006 version.
  2. Wu TJ; Yang J; Xiu LH (2015). "A new species of Bibarba (Teleostei: Cypriniformes: Cobitidae) from Guangxi, China". Zootaxa. 3905 (1): 138–144. doi:10.11646/zootaxa.3905.1.9. PMID 25661027.
  3. Bohlen J; Li F; Šlechtová V. (2020). "Phylogenetic position of the genus Bibarba as revealed from molecular genetic data (Teleostei: Cobitidae)". Ichthyological Exploration of Freshwaters. 29: 297–304.
  4. You He; Yongxia Chen; Jian Yang; Lawrence M Page (2021). "Phylogenetic analysis and osteological comparison of the cave-dwelling spined loach, Bibarba parvoculus (Cypriniformes: Cobitidae), and its surface congener". Zoological Journal of the Linnean Society. 191 (4): 1059–1074. doi:10.1093/zoolinnean/zlaa073.


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