Devario anomalus
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Devario anomalus , subadult male, adult female, subadult male |
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| Devario anomalus | ||||||||||||
| Conway , Mayden & Tang , 2009 |
Devario anomalus is a bear of the genus Devario . It was only described in 2009and lives in the extreme southeast of Bangladesh in creeks in the district of Cox's Bazar , south of the city of Cox's Bazar and in the district of Bandarban in the catchment area of the Sangu above Bandarban .
description
Devario anomalus is one of the larger species of the genus Devario with a standard adult length of 69 to 81 millimeters . The bodies are elongated and laterally strongly flattened with a complete sideline . In preserved specimens, the body is light olive-green on the back and cream-colored on the belly. The lively color is light brown on the back and shimmering pink and silver on the flanks and belly, depending on the incidence of light around the sidelines shimmering green. The drawings on the living specimen are gray to anthracite in color. There is a noticeable shoulder mark on the rear edge of the gill cover. In the front half of the body there are five to eight vertical dark stripes on the sides. There is a clear gap to the rear and then, beginning at the base of the anal fin or before, a dark longitudinal stripe over the last third of the body to the tail fin stalk .
There are 30 to 35 scales in the lateral row, 8½ to 9½ in the transverse row and 12 scales around the caudal stalk. The dorsal fin and anal fin are elongated with rounded tips. They reach in length to about a quarter or a third of the caudal fin, while the fins of larger specimens are relatively longer. The caudal fin is rounded. The pectoral fins are rounded, they reach about two thirds of the way from their base to the anal fin. The pelvic fins are elongated but not pointed. Their ends only reach the anus in large males, but they usually stay shorter.
- Fin formula
Dorsal III / 11–12, anal III / 13–14, caudal 10 + 9, ventral I / 7, pectoral I / 12.
Devario anomalus can be distinguished from all other species of the genus Devario by its unique pattern. It differs from the Malabar fish ( Devario aequipinnatus ) in the shorter posterior side markings that begin only behind the attachment of the dorsal fin. Compared to Devario devario , the barbels on the mouth and the smaller number of scales on the lateral line and around the tail fin stalk as well as the smaller number of soft rays on the dorsal fin and anal fin are striking.
distribution
The type location is a stream flowing to the Bay of Bengal , which forms a pool at the foot of a waterfall and further down, south of Cox's Bazar , crosses a country road ( 21 ° 21 ′ 18.4 ″ N , 92 ° 1 ′ 29.9 ″ O ). There, the kind with which was ticto barb ( Puntius ticto ) and a type of Mojarras (Gerreidae) socialized. Other sites are south of Cox's Bazar, including in the Kudum Cave , and in the Bandarban district in the Sangu catchment area above Bandarban . More detailed descriptions of the other sites are not available.
Hazard and protection
Devario anomalus was named Globally Endangered ( VU - Vulnerable ) by the IUCN in 2010 . In addition to its small area of distribution, its attractive color was named as the cause of the threat, which makes it an attractive object for the ornamental fish trade. In the Red List of Endangered Southern Water Fish of Bangladesh from 2015, Devario anomalus was classified as threatened ( E - Endangered ). The small known distribution area would have justified the classification of Devario anomalus in the IUCN's highest risk category ( CR - Critically Endangered ), but this was not done because of the possibility that there could be undiscovered occurrences.
Systematics and taxonomy
Devario anomalus is one of more than 40 species of the genus Devario Heckel , 1843, which forms with Danio , Microrasbora and several other genera the subfamily Danioninae in the family Bärblinge (Danionidae). Four of the species of the Devario genus have been recorded in Bangladesh: Devario devario with localities all over the country, Devario aequipinnatus whose distribution in Bangladesh is limited to the north of the Chittagong division , but which also occurs in northeastern India, Devario anomalus and the only one in 2017 described Devarius coxi with Terra typica and other localities in the district of Cox's Bazar. Devario anomalus forms a clade with the morphologically similar Devario xyrops from neighboring Myanmar .
The holotype is an adult specimen of 71.6 millimeters standard length captured in December 2007. It is in the collection of the Florida Museum of Natural History in Gainesville with four paratypes . Another paratype is kept in the Zoological Reference Collection of the Lee Kong Chian Natural History Museum at the National University of Singapore . The species name anomalus (ἀνώμαλος) is ancient Greek and means irregular or uneven , it refers to the irregular vertical stripes on the front part of the body.
Web links
- Devario anomalus on Fishbase.org (English)
- Devario anomalus onthe IUCN Red List of Threatened Species .
Individual evidence
- ↑ a b c d e Kevin W. Conway, Richard L. Mayden and Kevin L. Tang: Devario anomalus, a new species of freshwater fish from Bangladesh (Ostariophysi: Cyprinidae) . In: Zootaxa 2009, Volume 2136, pp. 49-58, doi: 10.5281 / zenodo.188504 (first description).
- ↑ a b Sven O. Kullander et al .: Devario in Bangladesh: Species diversity, sibling species, and introgression within danionin cyprinids (Teleostei: Cyprinidae: Danioninae) . In: PLOS ONE 2017, Volume 12, No. 11, Article e0186895, doi: 10.1371 / journal.pone.0186895 .
- ↑ Devario anomalus in the endangered Red List species the IUCN 2010 Posted by: W. Vishwanath, 2010. Retrieved on 14 May of 2019.
- ↑ Mostafa Ali Reza Hossain: Devario anomalus . In: IUCN Bangladesh (ed.): Red List of Bangladesh. Volume 5. Freshwater Fishes . International Union for Conservation of Nature (IUCN), Bangladesh Country Office, Dhaka 2015, p. 71.