''Danio annulosus'' is a species of Chain

danio ''Danio'' is a genus of small freshwater fish in the family Cyprinidae found in South and Southeast Asia, commonly kept in aquaria. They are generally characterised by a pattern of horizontal stripes, rows of spots or vertical bars. Some species ...

fish in the family Cyprinidae in

Danio ''Danio'' is a genus of small freshwater fish in the family Cyprinidae found in South and Southeast Asia, commonly kept in aquaria. They are generally characterised by a pattern of horizontal stripes, rows of spots or vertical bars. Some species ...

genus. The species is named and described jointly by Sven O Kullander, M.D Mizanur Rahman, Michael Noren and Abdur Rob Mollah in 2015 in association with the Department of Zoology, Swedish Museum of Natural History, Sweden and the Department of Zoology,

University of Dhaka The University of Dhaka (also known as Dhaka University, or DU) is a public research university located in Dhaka, Bangladesh. It is the oldest university in Bangladesh. The university opened its doors to students on July 1st 1921. Currently i ...

Bangladesh Bangladesh (}, ), officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 165 million people in an area of . Bangladesh is among the mos ...

. The study and paper on Danio annulosus was published in

ZooTaxa ''Zootaxa'' is a peer-reviewed scientific mega journal for animal taxonomists. It is published by Magnolia Press (Auckland, New Zealand). The journal was established by Zhi-Qiang Zhang in 2001 and new issues are published multiple times a week ...

both online and in print in the same year (2015). It was collected from a small pool at the bottom of the Shuvolong Falls in the Kaptai Lake system in

Rangamati Rangamati (Bengali: রাঙ্গামাটি;) is the administrative headquarter and town of Rangamati Hill District in the Chittagong Hill Tracts of Bangladesh. The town is located at 22°37'60N 92°12'0E and has an altitude of . The dist ...

district in the Chittagong division, Bangladesh. The species name annulosus is derived from the neo-Latin word meaning "ringed", from the color pattern on the side of the fish which resembles a pattern of dark rings.

Distribution

''Danio annulosus'' is so far known only from a small pool below the Shuvolong waterfalls during the summer when the water was stand still in the pool. There is a good chance of finding them in Kaptai lake system formed by the damming of Karnafuli River, as a small stream drains the pool to kapati lake.

Description

''Danio annulosus'' is the 25th species of the Danio identified. Just like all the chain danios ''Danio annulosus'' has chain like pattern instead of the striped patterns of zebra danios. As all the chain danios, Danio annulosus has the same color pattern containing a series of dark rings with light color space beside it, a complete lateral line, 14 circumpendular scales, have the first ray in the pectoral fin and a black

humeral spot Humeral spot (from Latin ''humerus'', pertaining to the shoulder) is a mark or pattern found on several species of fish, typically above the pectoral fin Fins are distinctive anatomical features composed of bony spines or rays protruding fro ...

. ''Danio annulosus'' is different from the rest of the Puntius species by many features such as a much shorter pecotal and pelvic fins, the humeral spot is a bit wider and deep, instead of round or deep wide. No sexual dimorphism is present in Danio annulosus.

Coloration

Healthy adult individuals in life have dark stripes which include circles which are blue in color with the space in between including the circle centres are orange in color. A unique orange spot is seen in the front of the black cleithral spot.

Holotype

The holotype DU 50001 is an adult individual and probable female, 71.5 mm in length and collected form a Chittagong Division, Rangamati District, Borokal, pool at bottom of Shuvolong Waterfall on 28 Nov 2014.

References

{{Taxonbar, from=Q22286725 Danio Fish of Bangladesh Fish described in 2015