A relatively large and deep-bodied Stomatorhinus, depth 25–29% SL. Dorsal and ventral profiles gently convex, head profile above the eye nearly straight. Snout is rounded, not truncate, and projects noticeably beyond mouth. Mouth small. Teeth 7–9/8–10. Eye size in middle range for genus, 9-14% HL. Interorbital distance is 63–83% of head width. Head width 44–50% HL. Teeth usually 9/10, although sometimes as few as 7/8. Dorsal rays 17–20, anal rays 21–22, pectoral rays 10. Total scales along longitudinal line 46–53, the first 39–48 bearing a lateral-line pore. Pore-bearing scales terminate on caudal peduncle. Caudal peduncle with 12-14 circumpeduncular scales. Scale rows between origin of pelvic fin and lateral line scale 12–14. Total vertebrae 37-39 (excluding urostyle).
up to 100 mm SL
Widespread within the Ogooué basin of Gabon (although apparently absent from the upper Ivindo). It also occurs in the Niari-Kouilou of Congo-Brazzaville. See FishBase for museum records and localities.
Stomatorhinus walkeri has been taken both in small streams and in deep water among rocks in the Ogooué River channel.