Sundasalanx

Sundasalanx
Systematics
Cohort : Otomorpha Order : Herring-like (Clupeiformes) Subordination : Clupeoidei Family : Herring (Clupeidae) Subfamily : Ehiravinae Genre : Sundasalanx
Scientific name
Sundasalanx
Roberts , 1981

Sundasalanx is a genus of tiny freshwater fish from the order of the herring-like (Clupeiformes). They occur in the Mekong basin in Laos and Thailand , in southern Thailand and on Kalimantan . They were named after the Sunda Islands and Salanx , a genus of the smelt- like (Osmeriformes).

features

The fish are only 2.2 to 3 centimeters long. Your body is transparent and flaky. There is only one external nostril on each side of the head. The number of vertebrae is 37 to 43, that of the Branchiostegal rays is four. The dorsal and anal fins are located on the back of the body. They are supported from 11 to 14 or from 15 to 21 rays . There are five of the pelvic fins, the pectoral fins have no fin rays. An adipose fin is missing. The symplecticum , the interoperculare, a bone of the gill cover , and the circumorbital bones around the eyes are absent. Sundasalanx is progenetic , which means that the fish become sexually mature in a larva-like stage of their individual development .

External system

Sundasalanx was placed by Tyson R. Roberts in an independent family, the Sundasalangidae, which only includes this genus. This was initially assigned to the smelt-like (Osmeriformes), later the herring-like (Clupeiformes). Nelson assigns them provisionally as the subfamily Sundasalanginae to the herring (Clupeidae). Sébastien Lavoué and colleagues put the genus in the subfamily Ehiravinae within the herring family. There they are the sister group of a clade of the Southeast Asian genera Clupeichthys and Clupeoides .

species

Seven species have been described so far:

• Sundasalanx malleti
• Sundasalanx megalops
• Sundasalanx mekongensis
• Sundasalanx mesops
• Sundasalanx microps
• Sundasalanx platyrhynchus
• Sundasalanx praecox

literature

• Joseph S. Nelson : Fishes of the World . John Wiley & Sons, 2006, ISBN 0-471-25031-7 .

Individual evidence

1. ^ Sébastien Lavoué, Peter Konstantinidis & Wei-Jen Chen: Progress in Clupeiform Systematics. in Konstantinos Ganias (Ed.): Biology and Ecology of Sardines and Anchovies. CRC Press, 2014, ISBN 978-1482228540

Web links

• Sundasalanx on Fishbase.org (English)