Periophthalmus malaccensis Eggert 1935

Distinguished by the following characteristics: pelvic frenum prominent; pelvic fins partially united by basal membrane; D 1 height moderate, its margin slightly rounded, a brown stripe inframarginally with numerous white spots proximally, first spine elongate; D2 with single dusky stripe mesially; dorsal fins not connected by membrane; D 1 with 9-10 spines; longitudinal scale count 47-61; head width 14.3-19.5% SL; pelvic fin length 13.6-16.1 % SL; length of anal fin base 15.4-20.6% SL; length ofD2 base 17.0-23.2% SL; total D2 elements 11-12; total anal fin elements 11-12; TRDB 14-17 (Ref. 5218).

Amphidromous. Refers to fishes that regularly migrate between freshwater and the sea (in both directions), but not for the purpose of breeding, as in anadromous and catadromous species. Sub-division of diadromous. Migrations should be cyclical and predictable and cover more than 100 km.Characteristic elements in amphidromy are: reproduction in fresh water, passage to sea by newly hatched larvae, a period of feeding and growing at sea usually a few months long, return to fresh water of well-grown juveniles, a further period of feeding and growing in fresh water, followed by reproduction there (Ref. 82692).

Amphibious air-breather (Ref. 31184).