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Tran, H.D. et al (Open Source) (3)

The usage of the generic names Chimarrichthys Sauvage, 1874 and Euchiloglanis Regan, 1907 (Siluriformes: Sisoridae: Glyptosterninae) for the same genus-group taxon has been controversial (Ng & Jiang 2015, Thoni & Gurung 2018). Kottelat (2013) and Kang et al. (2016) proposed the name Euchiloglanis to be replaced by the senior synonym Chimarrichthys, thus Euchiloglanis longus Zhou, Li & Thomson, 2011 was renamed as Chimarrichthys longus (Zhou, Li & Thomson, 2011) (Kottelat 2013). Ferraris (2007) proposed the junior synonym Euchiloglanis to be considered valid due to its prevailing usage compared to Chimarrichthys. Furthermore, the generic name Chimarrichthys is currently used for three species (C. davidi, C. kishinouyei and C. longibarbatus) restricted to the upper Yangtze River in the Hengduan Mountain Region of China (Zhou et al. 2011a). Therefore, in the present study, although species placed in both Chimarrichthys and Euchiloglanis were compared, the latter generic name was used for species distributed in the Red River system. Euchiloglanis spp. (and Chimarrichthys spp.) are characterised by having premaxillary tooth bands that extend posteriorly (Chu 1981). Prior to the present study, six species were recognised, i.e., E. davidi, E. kishinouyei, E. longibarbatus, E. longus (Kottelat 2013), E. phongthoensis and E. dorsoarcus (Nguyen 2005) (Tran, H.D. et al). Description: Euchiloglanis (Chimarrichthys) nami can be distinguished from congeners by the following unique combination of characteristics: D. i, 6; A. i, 4; P. i, 15–16; C. 16; wider premaxillary tooth band without indentation; elongate and threadlike maxillary barbell with pointed tip reaching to pectoral fin origin; elongated papilae ventral part of maxillary barbell; anal-fin origin closer to cauda lfin base than to pelvic-fin insertion; distance from adipose-fin origin to dorsal-fin insertion close to 50% of length of adipose-fin base; depth of caudal peduncle equal to 20.26–27.40% of length of caudal peduncle; shorter dorsal-fin insertion to adipose-fin origin (12.05–15.90% SL); shorter caudal-fin length (11.53–13.42% SL); longer adipose-fin base length (31.81–35.74% SL); adipose fin not connected with caudal-fin base; pelvic fins reaching anus or a little beyond anus; narrower interorbital width (20.97– 29.45% HL) (Tran, H.D. et al). Colouration: Greyish brown on dorsal and lateral surfaces of head and body, light yellow on Anal-fin base ventral region. Dorsal surfaces of head and body with series of small light-yellow patches: two ovoid patches on occipital region, three on each side of base of dorsal fin origin, two on each side of base of dorsal fin base, elliptical patch on anterior base of origin and last of adipose fin. Adipose fin greyish brown, with lighter colour around distal margin. Caudal fin greyish brown at base, caudal fin tip fading to pale yellow in distance, with dark submarginal band. Dorsal surfaces of pectoral and pelvic fins greyish brown, ventral surfaces light yellow (Tran, H.D. et al). Etymology: The specific name is in honour of the young ichthyologist and our best friend Mr. Chu Hoang Nam. The species name is a noun in genitive case (Tran, H.D. et al). Remarks: According to Eschmeyer's Catalog of Fishes the correct genus name is now Chimarrichthys but you can still find this species on some online searches as Euchiloglanis nami.

None

Euchiloglanis nami

Sisoridae

Asia: Known from the Gam River (Song Gam) drainage, a tributary of the Red River in northern Vietnam.

14.0cm. (5½ins)

18-24°c (64-75°f.)

6.0-7.0.

Fish in the News 2023 (FB).
Tran, H.D., Nguyen, D.H., Dang, H. T. T., Nguyen, H.Q. & Nguyen, N.T. (in press): A New Species of Euchiloglanis Regan, 1907 (Actinopterygii: Sisoridae) from Vietnam. Acta Zoologica Bulgarica, in press. Published online 30 January 2023.