Black-barred Danio

description

Description. General body features and pigmentation are illustrated in Figures 6 – 7. Measurements are summarized in Table 2. Counts from the holotype are marked with an asterisk (*). Body compressed, elongate. Sexes isomorphic. Head laterally compressed, slightly deeper than wide. Snout short, obtuse, about equal to eye diameter. Mouth terminal, oblique in profile, jaws about equal in anterior extension or lower slightly projecting. Small bony knob at dentary symphysis fitting into notch in upper jaw. Maxilla reaching to slightly beyond vertical from anterior margin of orbit. Lower jaw ending anteriorly at about upper 1 / 3 of eye ¸ posteriorly below about middle of orbit. Lower jaw with anterior lateral lobe margined with sharp, pointed tubercles, similar tubercles also distributed over anterior portion of dentary in varying number and density. Rostral barbel long, reaching to slightly beyond preopercular margin; maxillary barbel long, reaching slightly beyond posterior margin of pectoral-fin base. Lateral line complete, comprising 34 (2), 35 * (9), 36 (1) scales; descending anteriorly for about 6 – 7 scales, posteriorly paralleling ventral profile. Median predorsal scales 15 (1)

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

diagnosis

Diagnosis. Distinguished from all other species of Danio except D. feegradei by the presence of a prominent elongate or round black spot at the base of the caudal fin (vs. absence; or minute and inconspicuous in D. jaintianensis, D. choprae and D. flagrans; or small, round and margined by a light zone in D. erythromicron), a small black or grey cleithral spot and a light (orange in life) spot immediately above cleithral spot (vs. absence; or present, large and not bordered by light spot in D. assamila, catenatus, D. concatenatus, D. dangila, D. sysphigmatus; or minute, not separated from P stripe and not associated with light spot in D. meghalayensis). Distinguished from all Danio except D. feegradei, D. assamila, catenatus, D. concatenatus, D. dangila, D. meghalayensis and D. sysphigmatus by complete lateral line (vs. abbreviated or absent) and 14 circumpeduncular scales (vs. 10 – 12). Distinguished from D. feegradei by presence of about 7 – 11 distinct dark vertical stripes on abdominal sides (vs. absence), and absence of light dots along middle of side (vs. presence).

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

etymology

Etymology. Absconditus is a Latin adjective meaning disguised, secret or hidden. Its application here is inspired both by the colour pattern, which strongly resembles that of barred species of Devario Bleeker and the relatively late discovery and recognition of the species. Geographical distribution (Fig. 5). Danio absconditus is known only from a small part of the western slope of the Rakhine Yoma, where it has been collected from headwaters of small coastal streams near Gwa, and headwaters of the Kyeintali Chaung.

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

materials_examined

Holotype. BMNH 2011.3.24.29, 51.7 mm SL. Comepyo Chaung, 17 ° 40 ′ 57 ″ N, 94 ° 38 ′ 25 ″ E, and Mway Tway Chaung, 17 ° 38 ′ 53 ″ N, 94 ° 36 ′ 35 ″ E. 3 Dec 2009, R. Britz. Paratypes. All from Myanmar, Rakhine State. BMNH 2011.3.24.30 - 43, 14, 26.5 – 38.0 mm SL; NRM 66247, 5, 25.2 – 37.1 mm SL. Same data as holotype. — BMNH 2015.3.3.129 - 136, 8, 16.3 - 32.2 mm SL. Baw Di Chaung, Gwa Township, about 17 ° 34 ′ 15 ″ N, 94 ° 43 ′ 47 ″ E. 20 Jan 2005, Ya Htut Oo. — BMNH 2015.3.3.137, 1, 32.1 mm SL. Headstream of Kyeintali Chaung, Kyeintali Township, about 17 ° 45 ′ 39 ″ N, 94 ° 45 ′ 23 ″ E, 5 Mar 2006, Tin Win et al.

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