Collected on the coastal edge of the lagoon-salt marsh complex: a salt marsh with channels bordered by reeds and saw grass and the bottom peaty. Size at maturity at 2.4 cm SL .
Anal spines: 1; Anal soft rays: 15 - 17; Vertebrae: 39 - 42. This species belonging to the M. martinica species-group, is distinguished from all congeners by the following characters: anus is positioned closer to the insertion of pelvic fin than the origin of anal fin; posterior margins of predorsal and lateral scales are smooth or slightly irregular, not laciniate; the least depth of caudal peduncle 6.7-8.5% SL; total gill raker of first arch 16-20, modally 18-19 .Cross section: compressed.
Behavioural data for Membras Pygmaea is currently being reviewed.
Diet information for Membras Pygmaea is currently being compiled.
Reproduction data for Membras Pygmaea is currently being compiled.
Marine; pelagic-neritic. Tropical
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