Olyra

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Olyra
Olyra longicaudata

Olyra longicaudata

Systematics
Overcohort : Clupeocephala
Cohort : Otomorpha
Sub-cohort : Ostariophysi
Order : Catfish (Siluriformes)
Family : Spiny Catfish (Bagridae)
Genre : Olyra
Scientific name
Olyra
McClelland , 1842

Olyra is a genus of Asian catfish that is mainly known from northeast India , Bangladesh and Myanmar . There is also a single record from Nepal and the species Olyra astrifera ,which was only described in 2013,occurs in southern Kerala (southern India).

features

Olyra catfish grow to a length of 5.8 to 14.5 cm and are elongated, scaly and unarmored. The head and muzzle are flattened. The eyes are small and overgrown with skin. The fish have eight barbels . The gill covers are inclined towards the front dorsal fin. The dorsal fin has 7 or 8 soft rays, hard rays are absent. The anal fin is supported by 15 to 23 rays . There is a low adipose fin located far back, just in front of the caudal fin. The pelvic fins have six rays. The pelvic girdle has a well-developed posterior outgrowth that is clearly separated from the anal fin. The caudal fin is bifurcated, with the upper lobe being much larger, or tapering to a point. The number of vertebrae is 48 to 53.

habitat

Olyra species are typically found in slow-flowing, shallow waters with muddy bottoms.

Systematics

The genus Olyra was described in 1842 by the British physician and zoologist John McClelland , who worked in India . It is often assigned to an independent family Olyridae , which only contains the genus Olyra and is therefore monotypical . However, phylogenetic studies showed that Olyra is a highly specialized genus of spiny catfish (Bagridae).

species

There are currently (February 2018) nine valid types:

literature

  • Arunachalam, M., Raja, M., Mayden, RL & Chandran, A. (2013): Olyra astrifera a new species of olyrid catfish from the Western Ghats, Southern India (Teleosti [sic!]: Bagridae: Olyrininae) and the designation of neotype, Olyra longicaudata McClelland, 1842 from North-Eastern India. International Journal of Zoology and Research (IJZR), 3 (2): pp. 51-60.
  • Ng, HH, Lalramliana & Lalthanzara, H. (2014): Olyra saginata, a new species of bagrid catfish (Actinopterygii: Siluriformes) from northeastern India. Zootaxa , 3821 (2): 265-272. doi: 10.11646 / zootaxa.3821.2.6
  • Heok Hee Ng and Carl J Jr. Ferraris. 2016. A New Species of Anguilliform Catfish (Actinopterygii: Siluriformes: Bagridae) from Bangladesh and northeastern India. Zootaxa. 4079.3; 388-392.

Web links

Commons : Olyra  - collection of images, videos and audio files