Bostrychus microphthalmus Hoese & Kottelat 2005

Differs from other species of the genus by possessing reduced eyes covered with skin and reduced head canal development, body pigment and head squamation. Distinguished by the combination of the following characters: eye minute, covered with skin; vomer with a patch of teeth conical and short, with pointed tips, arranged in 5-6 rows in an inverted V; palatine without teeth; head pores present, lateral canal tube above operculum and preoperculum reduced, absent or confined to a short detached tube above preoperculum and/or a short tube above operculum; predorsal scales cycloid, reaching forward to near anterior end of snout; operculum with small embedded cycloid scales; side of head covered with embedded scales, except for below and before anterior margin of eye; no scales on interoperculum or branchiostegal membranes; gill opening extending forward to below a point 2-3 eye diameters before posterior preopercular margin (to just before margin in one specimen); first dorsal-fin pterygiophore formula 4 (12211) in 2 or 3 (131111) in 2, last 2-3 pterygiophores without spines; vertebrae 14-15 + 15-16 = 29-30; body pale, with few melanophores along margins of scales on dorsal surface of body (Ref. 55841).Description: First dorsal fin spines 5, 6; second dorsal fin I,10-12 (Ref. 55841).

Anal spines: 1; Analsoft rays: 9 - 10; Vertebrae: 29 - 30

Inhabits caves, usually in backwaters where it lies on clay bottom (Ref. 55841).

Bostrychus microphthalmus is a species of fish from the family Butidae. It is endemic to Maros karst in southern Sulawesi, Indonesia. It was the first documented cave-dwelling fish in Sulawesi, but since then the brotula Diancistrus typhlops has been described from nearby Muna Island, and an additional apparently undescribed eleotrid is known from Sulawesi's Maros karst.

The specific name of B. microphthalmus refers to the small eyes of this fish.