Corresponding author: Xiao-Yong Chen (
Academic editor: N. Bogutskaya
During a survey of the Mali Hka River drainage in Hponkanrazi Wildlife Sanctuary in December 2015, a new species was collected and is described herein as
Chen X-Y, Qin T, Chen Z-Y (2017)
The
The genus
Measurements were made point to point with dial calipers and recorded to 0.2 mm. Counts and measurements were made on the left side of the specimens when possible. Subunits of the head were measured as proportions of head length standard length Kunming Institute of Zoology Chinese Academy of Sciences Southeast Asia Biodiversity Research Institute
KIZ2015006376 (CXY20150125), 102.14 mm
KIZ2015006375 (CXY20150124), KIZ2015006377 (CXY20150126), 2 ex., 78.88–99.26 mm
Morphometric data are listed in Table
Tooth band of
Comparison of posterior margin of maxillary barbel of
Morphometric data of
Catalog number | Holotype | Range | Mean | SD |
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Total length (mm) | 114.3 | 80.1–135.0 | – | – |
Standard length (mm) | 102.1 | 70.6–120.6 | – | – |
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Head length | 18.5 | 16.5–22.9 | 20.0 | 2.53 |
Head width | 18.3 | 17.4–23.2 | 19.8 | 2.28 |
Head depth | 8.4 | 8.1–10.3 | 9.0 | 0.91 |
Predorsal length | 25.6 | 24.2–30.9 | 28.3 | 2.61 |
Prepectoral length | 12.5 | 11.2–16.4 | 13.4 | 1.92 |
Prepelvic length | 32.3 | 29.2–34.6 | 32.7 | 2.28 |
Preanal length | 61.3 | 61.3–69.3 | 66.2 | 2.93 |
Body depth at anus | 9.6 | 9.3–12.0 | 10.3 | 1.05 |
Caudal peduncle length | 29.9 | 25.4–33.2 | 29.7 | 2.99 |
Caudal peduncle depth | 3.6 | 3.1–4.8 | 3.8 | 0.58 |
Dorsal to adipose distance | 15.8 | 11.5–16.0 | 14.4 | 1.79 |
Post adipose length | 11.2 | 8.4–11.9 | 10.4 | 1.27 |
Dorsal fin base length | 9.0 | 7.8–10.6 | 9.3 | 1.11 |
Adipose fin base length | 36.8 | 36.3–39.2 | 37.5 | 1.19 |
Pectoral fin length | 25.0 | 23.4–29.0 | 26.3 | 2.28 |
Pelvic fin length | 21.0 | 20.5–25.9 | 23.1 | 2.11 |
Anal fin base length | 3.1 | 3.1–5.5 | 3.8 | 1.00 |
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Head width | 1.0 | 0.9–1.1 | 1.0 | 0.04 |
Head depth | 0.5 | 0.4–0.5 | 0.5 | 0.03 |
Snout length | 0.7 | 0.6–0.7 | 0.6 | 0.03 |
Interorbital width | 0.3 | 0.3–0.3 | 0.3 | 0.02 |
Eye diameter | 0.1 | 0.1–0.1 | 0.1 | 0.01 |
Nasal barbel length | 0.2 | 0.2–0.2 | 0.2 | 0.03 |
Maxillary barbel length | 1.0 | 0.8–1.1 | 0.9 | 0.08 |
Outer mandibular barbel length | 0.2 | 0.2–0.2 | 0.2 | 0.01 |
Inner mandibular barbel length | 0.2 | 0.1–0.2 | 0.2 | 0.03 |
Dorsal fin without spine and with i, 5 (7) rays. Adipose fin with long base. Anal fin with i, 2 (7) rays. Caudal fin emarginate, with 6/6 (7) rays. Pelvic fin greatly enlarged, with convex distal margin and i, 5 (7) rays; first ray flattened, with numerous plicae on ventral surface; tip of pelvic fin surpassing anus, and anus at midpoint between posterior end of pelvic fin base and tip of pelvic fin. Pectoral fin greatly enlarged, without spine and with i, 16 (4) or i, 17 (3) rays; first ray flattened, with numerous plicae on ventral surface. Tip of pectoral fin reaching beyond pelvic fin origin; Vertebrae 25+15=40 (3), or 26+14=40 (1).
Males with small genital papilla located immediately posterior to anus (Figure
Ventral view of anus and external genital papilla of
Known from high mountain streams of Mali Hka River drainage (upper Irrawaddy River drainage) in Hponkanrazi Wildlife Sanctuary, Kachin State, north Myanmar (Figure
Distribution map of
Fast flowing mountain streams with stone, cobble, and sand beds (Figure
Habitat of
From Hponkanrazi Wildlife Sanctuary, adjectival.
Within species of the
1 | Tip of maxillary barbel pointed; tip of pectoral fin not reaching pelvic fin origin |
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– | Tip of maxillary barbel rounded; tip of pectoral fin reaching or surpassing pelvic fin origin |
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2 | Nasal barbel reaching midway between its base and anterior orbital margin |
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– | Nasal barbel reaching anterior orbital margin |
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3 | Pectoral fin not reaching pelvic fin origin |
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– | Pectoral fin reaching pelvic fin origin |
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4 | Caudal fin lunate |
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– | Caudal fin emarginate |
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5 | Upper and lower caudal fin first principal rays of approximately equal length |
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– | Lower first principal ray of caudal fin much longer than upper |
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6 | Posterior margin of lower lip with lobulate projections |
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– | Posterior margin of lower lip entire |
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7 | Posterior margin of maxillary barbel entire |
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– | Posterior margin of maxillary barbel with lobulate or laciniate projections |
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8 | Posterior margin of maxillary barbel with lobulate projections; yellow patch below adipose fin absent |
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– | Posterior margin of maxillary barbel with laciniate projections; yellow patch below adipose fin present |
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10 | Posterior margin of maxillary barbel entire |
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– | Posterior margin of maxillary barbel with projections |
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11 | Distance between anal fin origin and caudal fin base almost equal to distance between pelvic and anal fin origins; anus much closer to snout tip than caudal fin base; patches on sides of body below adipose fin absent |
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– | Distance between anal fin origin and caudal fin base almost equal to distance between posterior end of pelvic fin base and anal fin origin; anus at midpoint between snout tip and caudal fin base; patch on sides of body below adipose fin present |
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12 | Posterior margin of maxillary barbel villiform; ovoid patch on base of first dorsal fin ray absent |
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– | Posterior margin of maxillary barbel lobulate; ovoid patch on base of first dorsal fin ray present |
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13 | Posterior margin of maxillary barbel lobulate; caudal peduncle depth 8–9% |
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– | Posterior margin of maxillary barbel with lobulate and laciniate projections; caudal peduncle depth 5% |
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We thank Shu-Sen Shu (Kunming Institute of Zoology (