Open Access Open Access  Restricted Access Subscription or Fee Access


DOI: http://dx.doi.org/10.11646/zootaxa.3948.2.5

Description of Danio absconditus, new species, and redescription of Danio feegradei (Teleostei: Cyprinidae), from the Rakhine Yoma hotspot in south-western Myanmar

SVEN O. KULLANDER, RALF BRITZ

Abstract


Danio feegradei Hora is redescribed based on recently collected specimens from small coastal streams on the western slope of the Rakhine Yoma, ranging from the Thade River drainage southward to slightly north of Kyeintali. Danio absconditus, new species, is described from the Kyeintali Chaung and small coastal streams near Gwa, south of the range of D. feegradei. Both species are distinguished from other Danio by the presence of a dark, elongate or round spot at the base of the caudal fin and a cleithral marking composed of a small black spot margined by a much smaller orange spot. Danio feegradei is characterized by the colour pattern, with series of white spots along the otherwise dark side; D. absconditus by about 7-–11 dark vertical bars on the abdominal side. Within Danio, the presence of a complete lateral line, cleithral spot, and 14 circumpeduncular scales is shared with D. dangila and similar species, but these character states may be plesiomorphic as suggested by the shared presence of cleithral spot and complete lateral line in Devario and Betadevario. In other Danio the cleithral spot is absent, the lateral line is short or absent, and the circumpeduncular scale count is lower (10–12). Twenty teleost species are reported from streams on the western slope of the Rakhine Yoma, all probably endemic. The parapatric distribution of D. absconditus and D. feegradei is unique within the genus, and may be partly explained by changes in eustatic sea levels.

 


Keywords


colour pattern, freshwater fish, morphology, species discrimination, taxonomy

Full Text:

PDF/A (3.75 MB)

References


Barman, R.P. (1991) A taxonomic revision of the Indo-Burmese species of Danio Hamilton Buchanan (Pisces: Cyprinidae). Records of the Zoological Survey of India. Occasional Paper, 137, 1–91.

Bender, F. (1983) Geology of Burma. Gebrüder Borntraeger, Berlin and Stuttgart, viii + 293 pp.

Britz, R. (2007) Channa ornatipinnis and C. pulchra, two new species of dwarf snakeheads from Myanmar (Teleostei: Channidae). Ichthyological Exploration of Freshwaters, 18, 335–344.

Britz, R. (2010) Species of the Macrognathus aculeatus group in Myanmar with remarks on M. caudiocellatus (Teleostei: Synbranchiformes: Mastacembelidae). Ichthyological Exploration of Freshwaters, 20, 295–308.

Clark, P.U. & Mix, A.C. (2002) Ice sheets and sea level of the Last Glacial Maximum. Quaternary Science Reviews, 21, 1–7.
http://dx.doi.org/10.1016/S0277-3791(01)00118-4

Collins, R.A., Armstrong, K.F., Meier, R., Yi, Y., Brown, S.D.J., Cruickshank, R.H., Keeling, S. & Johnston, C. (2012) Barcoding and border biosecurity: identifying cyprinid fishes in the aquarium trade. PLoS ONE, 7 (1), e28381.
http://dx.doi.org/10.1371/journal.pone.0028381

Conway, K.W. & Kottelat, M. (2010) Two new species of torrent minnow (Ostariophysi: Psilorhynchidae) from Western Myanmar. The Raffles Bulletin of Zoology, 58, 259–267.

Cottle, P.W. (2010) Danios and devarios. Peter W. Cottle, Rochester, 150 pp.

Fang, F. (1997) Redescription of Danio kakhienensis, a poorly known cyprinid fish from the Irrawaddy basin. Ichthyological Exploration of Freshwaters, 7, 289–298.

Fang, F. (1998) Danio kyathit, a new species of cyprinid fish from Myitkyina, northern Myanmar. Ichthyological Exploration of Freshwaters, 8, 273–280.

Fang, F. (2000) Barred Danio species from the Irrawaddy River drainage (Teleostei, Cyprinidae). Ichthyological Research, 47, 13–26.
http://dx.doi.org/10.1007/BF02674309

Fang, F. & Kottelat, M. (2000) Danio roseus, a new species from the Mekong basin in northeastern Thailand and northwestern Laos (Teleostei: Cyprinidae). Ichthyological Exploration of Freshwaters, 11,149–154.

Fang, F. & Kullander, S.O. (2009) Devario xyrops, a new species of danionine fish from south-western Myanmar (Teleostei: Cyprinidae). Zootaxa, 2164, 33–40.

Fang Kullander, F. (2001) Phylogeny and species diversity of the South and Southeast Asian cyprinid genus Danio Hamilton (Teleostei, Cyprinidae). PhD dissertation, Stockholm University, Stockholm, 26 pp.

Hora, S.L. (1937) Notes on Fishes in the Indian Museum XXXI. On a small collection of fish from Sandoway, Lower Burma. Records of the Indian Museum, 39, 323–331.

Humphries, J.M., Bookstein, F.L., Chernoff, B., Smith, G.R., Elder, R.L. & Poss, S.G. (1981) Multivariate discrimination by shape in relation to size. Systematic Zoology, 30, 291–308.
http://dx.doi.org/10.2307/2413251

Kottelat, M. (2013) The fishes of the inland waters of Southeast Asia: a catalogue and core bibliography of the fishes known to occur in freshwaters, mangroves and estuaries. The Raffles Bulletin of Southeast Asian Zoology, 27 (Supplement), 1–663.

Kullander, S.O. (2012) Description of Danio flagrans, and redescription of D. choprae, two closely related species from the Ayeyarwaddy River drainage in northern Myanmar (Teleostei: Cyprinidae). Ichthyological Exploration of Freshwaters, 23, 245–262.

Kullander, S.O. (2015) Taxonomy of chain Danio, an Indo-Myanmar species assemblage, with descriptions of four new species (Teleostei: Cyprinidae: Danioninae). Ichthyological Exploration of Freshwaters, 25, 355–378.

Kullander, S.O. & Fang, F. (2004) Seven new species of Garra (Cyprinidae: Cyprininae) from the Rakhine Yoma, southern Myanmar. Ichthyological Exploration of Freshwaters, 15, 257–278.

Kullander, S.O. & Fang, F. (2009a) Danio aesculapii, a new species of danio from south-western Myanmar (Teleostei: Cyprinidae). Zootaxa, 2164, 41–48.

Kullander, S.O. & Fang, F. (2009b) Danio tinwini, a new species of spotted danio from northern Myanmar (Teleostei: Cyprinidae). Ichthyological Exploration of Freshwaters, 20, 193–199.

Ng, H.H. (2004) Batasio elongatus, a new species of bagrid catfish from southwest Myanmar (Siluriformes, Bagridae). Ichthyological Exploration of Freshwaters, 15, 67–70.

Roberts, T.R. (2007) The “celestial pearl danio”, a new genus and species of colourful minute cyprinid fish from Myanmar (Pisces: Cypriniformes). The Raffles Bulletin of Zoology, 55, 131–140.

Systat Software (2009) Systat version 13. Systat Software, Inc., San Jose.

Tang, K.L., Agnew, M.K., Hirt, M.V., Sado, T., Schneider, L.M., Freyhof, J., Sulaiman, Z., Swartz, E., Vidthayanon, C., Miya, M., Saitoh, K., Simons, A.M., Wood, R.M., Mayden, R.L. (2010) Systematics of the subfamily Danioninae (Teleostei: Cypriniformes: Cyprinidae). Molecular Phylogenetics and Evolution, 57, 189–214.
http://dx.doi.org/10.1016/j.ympev.2010.05.021

Voris, H.K. (2000) Maps of Pleistocene sea levels in Southeast Asia: shorelines, river systems and time durations. Journal of Biogeography, 27, 1153–1167.
http://dx.doi.org/10.1046/j.1365-2699.2000.00489.x


Refbacks

  • There are currently no refbacks.


 
ISSN 1175-5326 (Print Edition) & ISSN 1175-5334 (Online Edition)
Published by Magnolia Press, Auckland, New Zealand
A founding journal of Biotaxa