Pseudomystus flavipinnis Ng & Rachmatika, 1999

Pseudomystus flavipinnis Ng & Rachmatika, 1999 View in CoL

( Figs. 8 View Fig , 9 View Fig )

Pseudomystus flavipinnis Ng & Rachmatika, 1999: 175 View in CoL , Fig. 5 (type locality: Sungai Embaloh at Benua Martinus, Kalimantan Barat, Borneo); Ng & Lim, 2005: 16; Ferraris, 2007: 103; Kottelat, 2013: 265.

Leiocassis stenomus View in CoL (non Valenciennes in Cuvier & Valenciennes, 1840): Vaillant, 1902: 15; Weber & de Beaufort, 1913: 355 (in part); Jayaram, 1968: 364 (in part).

Pseudomystus cf. stenomus View in CoL : Kottelat & Widjanarti, 2005: 160.

Pseudomystus stenomus View in CoL (non Valenciennes in Cuvier & Valenciennes, 1840): (?) Parenti & Lim, 2005: 190.

Material examined. MZB 6593 View Materials , holotype, 47.0 mm SL; Borneo: Kalimantan Barat, Sungai Embaloh at Benua Martinus . – ZRC 61229 View Materials , 10 View Materials , 22.9–37.2 mm SL; Borneo: Kalimantan Barat, vicinity of Ketapang . – ZRC 54544 View Materials , 14 View Materials , 26.0– 62.5 mm SL; Borneo: Kalimantan Tengah, Kahayan River drainage, Rungan River watershed . – ZRC 65444 View Materials , 1 View Materials , 68.5 mm SL; Borneo: Kalimantan Tengah, Kahayan River drainage, Rungan River watershed , Tahai area , Sungai Buyot , feeding to Danau Sagumang , 2°1′47″S 113°47′50″E GoogleMaps .

Diagnosis. Pseudomystus flavipinnis is distinguished from all congeners except P. breviceps , P. moeschii , P. myersi , P. nuchalis , P. stenomus , P. tuberosus , and P. vaillantii in having a colour pattern of pale yellow patches on the body (vs. a uniformly brown body, or with either pale yellow transverse bands or longitudinal stripes). It differs from P. breviceps , P. nuchalis , and P. stenomus in having a narrower snout (48–53% HL vs. 54–60; Fig. 3 View Fig ), adipose fin more posteriorly positioned relative to the anal fin (adipose-fin origin posterior to vertical through anal-fin origin vs. at vertical) and the yellow patches on the body frequently (vs. never) coalescing to form irregular bands. Pseudomystus flavipinnis is further distinguished from P. nuchalis in lacking (vs. having) a nuchal concavity (compare Figs. 4 View Fig and 8 View Fig ), and from P. stenomus in having a broader nuchal plate with straight or slightly convex margins (vs. narrower nuchal plate with slightly concave lateral margins; Fig. 2). It differs from P. moeschii in lacking (vs. having) a supracleithral process, and from P. myersi in having an adipose fin with a shorter base (14.9–19.5% SL vs. 31.5–34.1) whose posterior insertion is separate from (vs. adnate to) the dorsal procurrent caudal-fin rays. Pseudomystus flavipinnis is distinguished from P. tuberosus in having an evenly sloping (vs. strongly humped) predorsal profile, the absence (vs. presence) of rounded tubercles on the head and flanks, an adipose fin with a shorter base (14.9–19.5% SL vs. 23.3–26.1) and a deeper caudal peduncle (7.8–9.4% SL vs. 5.5–6.0), and from P. vaillantii in having a shorter head (23.5–25.9% SL vs. 27.0–29.0) and adipose-fin base (14.9–19.5% SL vs. 20.3–26.7).

Description. Morphometric data as in Table 1. Head depressed; dorsal profile evenly sloping or slightly convex. Ventral profile almost straight. Snout broadly rounded when viewed dorsally, width 48–53% HL. Bony elements of dorsal surface of head covered with thin skin. Midline of cranium with fontanelle extending from behind snout to beyond level of posterior orbital margin. Supraoccipital process of