Periophthalmus gracilis Eggert, 1935
Graceful mudskipper
photo by Polgar, G.

Family:  Oxudercidae (Mudskippers), subfamily: Periophthalminae
Max. size:  4.5 cm SL (male/unsexed)
Environment:  demersal; brackish; marine
Distribution:  Indo-Pacific: Indonesia, Malaysia, Singapore, Australia, and the Philippines.
Diagnosis:  Distinguished by the following characteristics: no pelvic frenum, or if present, only visible with magnification; pelvic fins totally separate; D 1 short and rounded, brown inframarginal stripe terminating into a prominent black spot, no elongate spines; D2 with single dusky stripe mesially; dorsal fins not connected by membrane; Dl with 9'-11 spines; longitudinal scale count 52-70; head width 14.2-19.3% SL; pelvic fin length 11.7-15.1 % SL; length of anal fin base 17.8-21.1% SL; length ofD2 base 18.8-21.3% SL; total D2 elements 12-13; total anal fin elements 11-12; TRDB 14-20 (Ref. 5218).
Biology:  An intertidal and amphibious air-breather that actively shuttling back and forth between rock pools and air (Ref. 31184).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


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