The habitat and biology is probably similar to A. panamensis. In the Gulf of Nicoya, Costa Rica, A. mundeola was noted to occur only in the northern part where salinities are generally lower.
Dorsal spines (total): 0; Anal spines: 0; Anal soft rays: 27 - 33. Body moderately deep. Snout pointed, about 1/2 to 3/4 eye diameter; maxilla moderate, tip somewhat bluntly pointed, reaching to middle of inter-operculum; gill cover canals of panamensis-type. Anal fin long, its origin under anterior rays of dorsal fin (occasionally just in front). A narrow silver stripe along flank, less than eye diameter.: elongated; Cross section: oval.
Behavioural data for False Panama anchovy is currently being reviewed.
Spawn in school .
Marine; brackish; pelagic-neritic. Tropical; 28°N - 5°N, 112°W - 78°W Central Pacific: Sonora, Mexico to Panama Bay.
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