title: Danio annulosus, a new species of chain Danio from the Shuvolong Falls in Bangladesh (Teleostei: Cyprinidae: Danioninae).
abstract: Danio annulosus, new species, is described from a small pool below the Shuvolong Falls in the Kaptai Lake system in Bangladesh. It shares with chain danios (D. assamila, D. dangila, D. catenatus, D. concatenatus, and D. sysphigmatus) a colour pattern consisting of series of dark rings with light interspaces along the side, complete lateral line, 14 circumpeduncular scales, a produced first ray in the pectoral fin, and a black humeral spot. It differs from other chain danios in possessing much shorter pectoral and pelvic fins, and a humeral spot that is slightly wider than deep instead of round or deeper than wide. The mitochondrial cytochrome c oxidase subunit I (COI) sequence separates D. annulosus from the most similar species, D. catenatus by a p-distance of 3.4%. Although recorded from only a single locality, Danio annulosus is expected to have a wider distribution in the Karnafuli River drainage.
authors.affiliation: Department of Zoology, Swedish Museum of Natural History, PO Box 50007, SE-104 05 Stockholm, Sweden.; Email: sven.kullander@nrm.se.
authors.forename: Sven O
authors.initials: SO
authors.lastname: Kullander
authors.affiliation: Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh:; Email: mizanfish@yahoo.com.
authors.forename: Md Mizanur
authors.initials: MM
authors.lastname: Rahman
authors.affiliation: Department of Zoology, Swedish Museum of Natural History, PO Box 50007, SE-104 05 Stockholm, Sweden.; Email: michael.noren@nrm.se.
authors.forename: Michael
authors.initials: M
authors.lastname: Norén
authors.affiliation: Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh:; Email: armolladu@gmail.com.
authors.forename: Abdur Rob
authors.initials: AR
authors.lastname: Mollah
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D001459:Bangladesh; D049628:Body Size; D003530:Cyprinidae / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics / Q000254:growth & development; D017753:Ecosystem; D005260:Female; D008297:Male; D009929:Organ Size; D010802:Phylogeny