A Review Of The Catfish Genus Pseudecheneis (Siluriformes: Sisoridae) From China, With The Description Of Four New Species From Yunnan Author Zhou, Wei Author Li, Xu Author Yang, Ying text Raffles Bulletin of Zoology 2008 2008-02-29 56 1 107 124 journal article 10.5281/zenodo.5354381 2345-7600 5354381 Pseudecheneis stenura Ng, 2006 ( Fig. 14 ) Pseudecheneis sulcatus – Chu, 1982: 431 (in part specimens from Irrawaddy ); Chu, Mo & Kuang , 1990: 196–197, Fig. 196 (in part specimens from Irrawaddy ) ; Chu & Mo 1999: 153–154, Fig. 98 (in part specimens from Irrawaddy ) . Pseudecheneis stenura Ng, 2006a: 57–61 , Fig. 5 (Longchuanjiang); Thomson & Page, 2006: 60 (Irrawaddy drainage, China ). Material examined. – KIZ 9811088 , 9811023 , 2 ex. , topotypes collected with the holotype , 85.3–93.9 mm SL, Longchuanjiang at Lianmengjie bridge, Tengchong County , Yunnan Province ; SWFC 0502001–012, 12 ex. , 73.8–90.5 mm SL, Sanchahe , Lianghe County , Yunnan Province . Morphometric data as in Table 3 . Diagnosis . – Pseudecheneis stenura 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). Further 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 from P. sympelvica in having separate pelvic fins (vs. fused). Further distinguished from other congeners except P. gracilis in having a deeper forked caudal fin, shortest ray of caudal fin circa 50% of longest ray (vs. 75%). Differs from P. gracilis in having two ovoid yellow patches on dorsal fin origin (vs. a saddle patch) ( Fig. 5B, C ); length of head longer, head length 20.1–23.7% SL (vs. 14.9–18.6), postorbital head length 8.5–11.4% in head length (vs. 4.5– 5.9), body depth 67.1–88.5% in head length (vs. 73.9– 112.2%). It differs from P. paviei in having 15-19 transverse ridges (laminae) of thoracic apparatus (vs. 9–13). Premaxillary tooth band semicircular and two or four teeth along its outer edge ( Fig. 2A ). Body covered with dense, rounded tubercles distributed irregularly, not uniformly ( Fig. 4A ). Tubercles decreasing in density gradually from occipital to caudal peduncle which almost no tubercles. Vertebrae 19+20=39. Fig. 13. Spots or patch at caudal fin: A, four spots isolated each other ( Pseudecheneis paviei , SWFC 9812006, 102 mm SL); B, one spot at lower lobe isolated from the big patch ( P. brachyurus , SWFC 200103394, paratype, 112 mm SL). Distribution . – This species is found in the Longchuanjiang, part of the Irrawaddy River drainage ( Fig. 11 ).