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Taxonomy of chain Danio, an Indo-Myanmar species assemblage, with descriptions of four new species (Teleostei: Cyprinidae)
Swedish Museum of Natural History, Department of Zoology. (Ichthyology)ORCID iD: 0000-0001-6075-0266
2015 (English)In: Ichthyological Exploration of Freshwaters, ISSN 0936-9902, Vol. 25, no 4, 357-380 p.Article in journal (Refereed) Published
Abstract [en]

Danio dangila is widely distributed in the Ganga and lower Brahmaputra basins of India, Nepal and Bangladeshand distinguished by the cleithral spot in the shape of a short vertical stripe (vs. a round spot in all similar species).Four new species are described, similar to D. dangila but with round cleithral spot and each diagnosed byspecies specific colour pattern. Danio assamila, new species, is reported from the upper and middle Brahmaputradrainage in India. Danio catenatus, new species, and D. concatenatus, new species, occur in rivers of the western slope of the Rakhine Yoma, Myanmar. Danio sysphigmatus, new species, occurs in the Sittaung drainage and smal lcoastal drainages in southeastern Myanmar. Those five species, collectively referred to as chain danios, make upa distinctive group within Danio, diagnosed by elevated number of unbranched dorsal-fin rays, long rostral andmaxillary barbels, complete lateral line, presence of a prominent cleithral spot, horizontal stripes modified intoseries of rings formed by vertical bars between horizontal dark stripes, and pectoral and pelvic fins each with the unbranched first ray prolonged and reaching well beyond the rest of the fin. Danio meghalayensis is resurrected from the synonymy of D. dangila, with D. deyi as a probable junior synonym. Danio meghalayensis has a colour pattern similar to that of chain danios with vertical bars bridging parallel horizontal stripes but usually predominantly stripes instead of series of rings, a smaller cleithral spot and shorter barbels, and the unbranched ray in the pectoral and pelvic fins is not prolonged. Danio meghalayensis is known only from the Brahmaputra drainagein Meghalaya, India. The geographical distribution of the chain danios represents a unique pattern for the region, and may be explained by different climate and river drainage systems during the latest glacial period

Place, publisher, year, edition, pages
2015. Vol. 25, no 4, 357-380 p.
Keyword [en]
Myanmar, Freshwater, Taxonomy, morphology, biogeography
National Category
Biological Systematics
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-1429OAI: oai:DiVA.org:nrm-1429DiVA: diva2:874628
Available from: 2015-11-27 Created: 2015-11-27 Last updated: 2015-11-30Bibliographically approved

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