Pseudecheneis sulcatoides Zhou & Chu, 1992

Zhou, Wei, Li, Xu & Yang, Ying, 2008, A Review Of The Catfish Genus Pseudecheneis (Siluriformes: Sisoridae) From China, With The Description Of Four New Species From Yunnan, Raffles Bulletin of Zoology 56 (1), pp. 107-124 : 120-121

Pseudecheneis sulcatoides Zhou & Chu, 1992

( Fig. 15 )

Pseudecheneis sulcatus – Chu & Chen, 1987: 375 (Xishuanbanna, Yunnan).

THE RAFFLES BULLETIN OF ZOOLOGY 2008

Pseudecheneis sulcatoides Zhou & Chu, 1992: 111–112 , Fig. 1 (Lancangjiang system); Thomson & Page, 2006: 61 (Mekong drainage, China).

Material examined. – Lancangjiang (Mekong River) drainage: KIZ 839059 , 1 ex., holotype, 105 mm SL , KIZ 839060 , 839063 , 748792 , 749945 , 4 ex., paratypes, 88–100mm SL, Yangbi , Yangbi County, Yunnan Province ; KIZ 76 , 1 ex., paratype, 83mm SL, Xiaoganlanba , Simao County, Yunnan Province ; KIZ 764006 , 1 ex., paratype, 73mm SL, Xiaohejiang , Simao County, Yunnan Province ; KIZ 737016 , 863867–868 , 863871 , 4 ex., paratypes, 74– 95mm SL, Menghai , Menghai County, Yunnan Province ; SWFC 9910001, 0005015–052, 38 ex. (2 DS), 49–100mm SL, Yangbi , Yangbi County, Yunnan Province .

Morphometric data as in Table 3.

Diagnosis. – Pseudecheneis sulcatoides is distinguished from P. sulcata in having longer pelvic fin, reaching base of the first anal fin ray (vs. not reaching), and from P. crassicauda in having longer pectoral fin, reaching origin of pelvic fin (vs. not reaching). Pseudecheneis sulcatoides is distinguished from P. serracula in having a shorter adipose fin base (length of adipose fin base 125–166.7% in length of anal fin base vs. larger than 200%), and further from P. sympelvica in having separate pelvic fins (vs. fused). It differs from P. paviei in having 14-21 transverse ridges (laminae) of thoracic apparatus (vs. 9-13). Premaxillary tooth band semicircular and outer teeth two or four ( Fig. 2A ). Body covered with dense, tubercles distributed uniformly, some longitudinal tubercles among rounded tubercles ( Fig. 4B ). Vertebrae 17+17=34.

Distribution. – This species is found in the main river and branches of low and middle Lancangjiang ( Fig. 11 ).

Figures

Fig. 15. Pseudecheneis sulcatoides, KIZ 839059, holotype, 105 mm SL; China: Lancangjiang (the upper Mekong River) drainage. Dorsal, lateral and ventral views.

Fig. 2. Premaxillary and mandibular tooth band. A, ventral view of semicircular premaxillary tooth band and four teeth along its outer edge (Pseudecheneis gracilis, SWFC 200102148, paratype, 68 mm SL, DS); B, dorsal view of crescent mandibular tooth band (P. gracilis, SWFC 200102148, paratype, 68 mm SL, DS); C, ventral view of semicircular premaxillary tooth band and eight teeth along its outer edge (P. paviei, SWFC 0005084, 62 mm SL, DS).

Fig. 4. Tubercles at dorsal of head: A, rounded tubercles (Pseudecheneis stenura, SWFC 0502004, 78.6 mm SL); B, some longitudinal tubercles among rounded tubercles (P. sulcatoides, SWFC 200005030, 75 mm SL).

Fig. 11. Map showing distribution of Pseudecheneis paucipunctatus, P. paviei, P. stenura, P. sulcata and P. sulcatoides.