Henicorhynchus caudimaculatus ( Fowler, 1934 )

Ciccotto, Patrick J. & Page, Lawrence M., 2020, Revision of the Genus Henicorhynchus, with a Revised Diagnosis of Gymnostomus (Cyprinidae: Labeoninae), Copeia 108 (3), pp. 485-502 : 485-502

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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Figures

FIG. 4. Henicorhynchus caudimaculatus. (A) ANSP 58332, holotype, 41.4 mm SL, (B) USNM 107960, holotype of Cirrhinus lineatus, 108.8 mm SL. Images not to scale. Photo A by K. Luckenbill (ANSP); photo B by S. Raredon (USNM).

FIG. 9. Distributions of georeferenced specimens examined of: (A) Henicorhynchus caudiguttatus and H. ornatipinnis, (B) H. caudimaculatus, (C) H. entmema, and (D) H. siamensis.