Stenogobius ophthalmoporus (Bleeker, 1853)

Causse, Romain, Mennesson, Marion I., Dahruddin, Hadi, Sauri, Sopian, Busson, Frédéric, Limmon, Gino, Wowor, Daisy, Hubert, Nicolas, Lord, Clara & Keith, Philippe, 2024, Stenogobius (Teleostei: Gobioidei: Oxudercidae) from Indonesia, Cybium 48 (3), pp. 229-245 : 237-238

Stenogobius ophthalmoporus (Bleeker, 1853)

Nine specimens, including syntypes ( ZMA 4510 ), were examined from Molucca Islands ( Indonesia) and Luzon ( Philippines). The main morphomeristic characters are given below .

D VI-I, 10; A I-9/10 (mainly 10); C 13; P 16-17 (mainly 16); PD 13-20; TRB 10-11; TRF 14-17; LS 46-51; ZZ caudal peduncle 9; ZZ D2 base 9-10; head length between 23 to 26 (in % of SL); preanal length 52-59 (in % of SL); predorsal 30-34 (in % of SL); BDL 16-29 (in % of SL); BDM 19-24 (in % of SL); caudal peduncle length 13-16 (in % of SL); HD1 21-35 (in % of SL); jaw length 8-9 (in % of SL); anal length 40-52 (in % of SL); second dorsal 40-56 (in % of SL); caudal peduncle depth 11-14 (in % of SL); space inter D1-D2 8-11 (in % of SL); eye diameter 4-7 (in % of SL); interorbital distance 4-6 (in % of SL); snout length 6-7 (in % of SL); interdorsal membrane distance 2-5 (in % of SL); pelvic length 19-26 (in % of SL); pectoral length 18-21 (in % of SL). Cheek scaled, opercle scaled; central pectoral base scaled; breast and belly scaled; predorsal region scaled on the anterior part to the first dorsal fin; according to Watson (1991), first dorsal fin with blackish marks on the posterior half of fin near base, marking darker posterior to fifth spine. Coloration of type first dorsal fin could not be analysed due to their bad state.

These congruent datasets allowed synonymising S. lacrymosus , which was previously supposed to be endemic to Luzon, with S. ophthalmoporus .

Because of the restricted number of specimens studied, sexual dimorphism for this species was not analysed.

Comparison within the Indonesian species

Stenogobius genivittatus differs from the other Asian species ( S. gymnopomus , S. laterisquamatus and S. ophthalmoporus ) in having more second dorsal rays (I-11 vs. I-10)

and anal rays (I-11 vs. I-10); pectoral rays (usually 15 vs. 15 to 17); predorsal scales usually 12-23 vs. 17-26 for S. laterisquamatus and 0-4 for S. gymnopomus ; lateral scale series 45-52 vs. 50-64 for S. laterisquamatus ; scales on preopercle, opercle, pectoral fin base are more often absent, whereas always or at least more often present for S. laterisquamatus and S. ophthalmoporus (suppl. data). Preanal length (% in SL) usually from 50 to 60, instead of 35-58 for S. laterisquamatus ; snout length (% in SL): varied from 5 to 11; zigzag peduncle scales 9 instead of 10-11 for S. laterisquamatus . Head length (% in SL) is usually between 25 and 32 (with a maximum value of 19-39) instead of 23-26 for S. ophthalmoporus .