Thread tail rays
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| by Bonde & Swart , 1924 |
The thread- tailed rays ( Anacanthobatidae ( Gr .: "A" = without; "akantha" = thorn; "bathys" = deep)) are a family of rays (Batoidea). It consists of 14 species of relatively small, 20 to 60 centimeters long rays, which are particularly noticeable because of their pointed snouts. The species in the family live in the coastal waters of tropical and subtropical seas. The family is not recognized by all authors. Nelson places the genus Anacanthobatis in the family of the real rays (Rajidae). Sinobatis and Indobatis were not yet described when his standard work on the fish classification Fishes of the World appeared.
features
The species of nematode rays are all small cartilaginous fish that reach body lengths of around 20 to 60 centimeters. The smallest species is Indobatis ori with an average body length of 21 centimeters while Sinobatis melanosoma is an average of 59 centimeters long. It is characterized by a pointed snout that ends in a filament. Dorsal fins are missing, but a thin caudal fin is present. There are five small gill slits on the abdomen . Both the top and the underside of the rays are smooth and have no skin teeth. The tail is thin and a little shorter than the rest of the body. Because of their leg- like pelvic fins, the fish are referred to in German as leg rays and accordingly in English as "leg skates".
Distribution and way of life
The animals live in the tropical western Atlantic, especially off the coast of southern Africa. They are also known from the China Sea , Indonesia and Australia . All species live on the sea floor in the deep sea and usually come to depths below 200 meters, with individual species such as Indobatis ori in particular being found at depths of 1,000 to 1,725 meters. There is no data available on the way of life and population sizes for almost all species.
Genera and species
The following 14 species are classified in the nematode ray family:
- Genus Anacanthobatis from Bonde & Swart , 1924
- Anacanthobatis marmoratus from Bonde & Swart, 1923
- Genus Indobatis Weigmann et al., 2014
- Indobatis ori (Wallace, 1967)
- Genus Schroederobatis Hulley, 1973
- Schroederobatis americana (Bigelow & Schroeder, 1962)
- Genus Sinobatis
- Sinobatis andamanensis Last & Bussarawit, 2016
- Sinobatis borneensis (Chan, 1965)
- Sinobatis brevicauda Weigmann & Stehmann, 2016
- Sinobatis bulbicauda Last & Séret, 2008
- Sinobatis caerulea Last & Séret, 2008
- Sinobatis filicauda Last & Séret, 2008
- Sinobatis kotlyari Stehmann & Weigmann, 2016
- Sinobatis melanosoma (Chan, 1965)
- Sinobatis stenosomus (Li & Hu in Chu, Meng, Hu & Li, 1982)
- Genus Springeria Bigelow & Schroeder, 1951
- Springeria folirostris (Bigelow & Schroeder, 1951)
- Springeria longirostris (Bigelow & Schroeder, 1962)
literature
- Joseph S. Nelson : Fishes of the World . John Wiley & Sons, 2006, ISBN 0-471-25031-7 .
- Wilfried Westheide & Reinhard Rieger: Special Zoology Part 2: Vertebrae and Skull Animals , 1st edition, Spectrum Akademischer Verlag Heidelberg • Berlin, 2004, ISBN 3-8274-0307-3 .
Individual evidence
- ↑ a b Last, PR, Weigmann, S. & Yang, L. (2016): Changes to the nomenclature of the skates (Chondrichthyes: Rajiformes). Pages 11 to 34 in Last, PR & Yearsley, GK (Ed.) (2016): Rays of the World: Supplementary information. CSIRO Australian National Fish Collection.
Web links
- Fad tail rays on Fishbase.org (English)