Henicorhynchus caudimaculatus
Creators: name: Ciccotto, Patrick J.
name: Page, Lawrence M.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Cypriniformes
Cyprinidae
Henicorhynchus
Henicorhynchus caudimaculatus

description: Henicorhynchus caudimaculatus (Fowler, 1934)   
Striped Mud Carp  
Figure 4  
 Tylognathus caudimaculatus Fowler, 1934:133, figs. 89–90. Type locality: Thailand, Chiang Mai. Holotype: ANSP 58332.   
 Cirrhinus lineatus Smith, 1945:163, fig. 25. Type locality: Thailand, Lam Ton Lang, a tributary of Menam Sak. Holotype: USNM 107960.   
 Cirrhinus caudimaculatus — Roberts, 1997.   
 Cirrhinus lineatus — Roberts, 1997.   
 Gymnostomus caudimaculatus — Kottelat, 2013.   
 Gymnostomus lineatus — Kottelat, 2013.   
 Diagnosis.— A member of Henicorhynchus distinguished from other members of the genus (Table 1) by the following   
combination of characters: mouth subterminal, weakly oblique to nearly horizontal (less than or equal to 208 to midline of body); maxillary barbels present; edge of rostral cap straight, without medial indent; longitudinal stripes on flanks in most specimens, particularly larger individuals;  
 FIG. 6.   
  Henicorhynchus ornatipinnis, CAS 91756, holotype, 69.4 mm SL. Photo by J. Fong (CAS).    
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 Cirrhinus lineatus Smith, 1945 share similar oromandibular morphology, specifically a subterminal, weakly oblique mouth, maxillary barbels, and a smooth rostral cap without a medial indent. Based on similarities in oromandibular structures and color patterns when comparing specimens of variable sizes, we recognize Cirrhinus lineatus as a junior synonym of H.   
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 caudimaculatus. There is ontogenetic variation in color pattern, with small individuals possessing a brown to black spot at the base of the caudal peduncle, with longitudinal stripes developing with age and the spot eventually disappearing. A similar pattern is observed in Lobocheilos rhabdoura (Fowler, 1934) (Ciccotto and Page, 2016a).   
 Ciccotto and Page—Revision of Henicorhynchus   
  Distribution.— Henicorhynchus caudimaculatus  is distributed in the Chao Phraya basin in Thailand and the Mekong basin in Cambodia, Lao PDR, and Thailand (Fig. 9B).   
 Material examined.— (Identified, but not measured if no SL given). Cambodia: Mekong basin: CAS 81552, 5, O Champha, 4–8 km upstream from its mouth into Tonle San (near Te Veng, Ratanakiri prov.), 14.10068N, 107.13528E, 14 February 1994; CAS 91763, 4, 39.8–49.2 mm SL, Se Khone at Stung Treng, 13.51678N, 105.96678E, 6 February 1994; CAS 91765, 1, 100.1 mm SL, Rotanah Kiri, O Changni, small stream on road from Ann Long Mea to Bang Lung, 13.73948N, 106.98738E, 12 February 1994; UMMZ 234464, 2, Kandal, Mekong River at northern tip of island upstream from Phnom Penh, 25 January 1996; UMMZ 234727, 1, Kandal, Prek Muk Kandal, across Tonle Sap from Phnom Penh, 1 March 1996. Lao PDR: Mekong basin: CAS 92453, 2, 76.8– 104.5 mm SL, Attapu, Houay Samong, about 1 km upstream from its mouth into Xe Pian near Ban Hin Lat, 18.41558N, 103.60088E, 10 April 1995; CAS 92480, 10, Sekong watershed, small mountain stream entering right side of Se Kaman just upstream from Se Kaman, 14 April 1995; CAS 94791, 8, Mekong River, at Bang Hang Khone, just below Khone Falls, 13.96758N, 105.92988E, June 1993; CAS 96192, 3, Nam Hinboun watershed; UMMZ 235345, 1, Champasak, Mekong River at Ban Hang Khone, just downstream from Khone Falls, 13.93338N, 105.93338E; UMMZ 238636, 1, Vientiane, Nam Ngao at south end of Nam Ngum Reservoir, 18.56488N, 102.63888E, 5 February 1997; UMMZ 238669, 1, same as UMMZ 238636; UMMZ 240585, 6, Bokeo Province, Mekong River, 5 km upstream from Houay Xai, 20.13338N, 100.38338E, 25 April 1997; UMMZ 241035, 1, Bokeo, Mekong River, 9 km upstream from Houay Xai, 20.36678N, 100.36678E, 22 April 1997; UMMZ 241136, 2, Bokeo, Nam Tin at Ban Paktin, Nam Tin, 20.18338N, 100.558E, 26 April 1997; UMMZ 241148, 3, Bokeo, Nam Ngam at Ban Namngion, 20.38338N, 100.36678E, 24 April 1997. Thailand: Chao Phraya basin: ANSP 58332, holotype of Tylognathus caudimaculatus, 41.4 mm SL, Chieng Mai, North Siam, 720 km N of Bangkok, 19.21128N, 98.97088E, 1 January 1933; ANSP 58333, 1, 26.8 mm, same as ANSP 58332; CAS 91781, 1, 53.3 mm SL, Menam Wang, 79 km by road north of Lampang and 6 km east of highway 1035, 18.93218N, 99.64958E, 28 February 1991; UMMZ 236742, 19, Ping River below Blaumipol Dam at guesthouse, 17.24068N, 98.98158E, 8 May 1965; UMMZ 236915, 1, Bung Borapet, tributary to Nau River, 4 km N. Nakhon Sawan, 15.70918N, 100.13548E, 11 November 1964. Mekong basin: CAS 79169, 5, mouth of Huay Ngao where it flows into Mekong, 1 km south of Ban Chaem Pong (ca. 30 km southeast of Chiang Khong), 20.1428N, 100.52698E, 12 May 1990; CAS 91764, 5 (of 7), 48.6–59.8 mm SL, Menam Kok at Tha Ton and up to 5 km downstream, 20.0498N, 99.38468E, 15 May 1990; CAS 91766, 9, Mekong mainstream between Pak Ing and Jom Paeng (about 4–5 km downstream), 20.17438N, 100.49018E, 16 January 1989; CAS 92855, 1, 77.7 mm SL, Mekong River mainstream, 14 km south of That Phanom, 16.82748N, 104.74998E, 6 April 1991; CAS 96196, 1, same as CAS 91766; UMMZ 251889, 1, Pong Need, trib. Pong River, 16.758N, 102.58E; USNM 107960, holotype of Cirrhinus lineatus, 108.8 mm SL, Lam Tong Lang, north of Pakjong, 14.748N, 101.30448E, 19 July 1925; USNM 119484, 1, 94.7 mm SL, Mefang, tributary of Mekok, 12 July 1936.   
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493
description: Published as part of Ciccotto, Patrick J. & Page, Lawrence M., 2020, Revision of the Genus Henicorhynchus, with a Revised Diagnosis of Gymnostomus (Cyprinidae: Labeoninae), pp. 485-502 in Copeia 108 (3) on pages 485-502, DOI: 10.1643/ci-19-304, http://zenodo.org/record/13628562