Otolith description

Otolith small, discoid with anterior and posterior projections. All margins entire, tending towards lobed in larger otoliths. Sulcus groove heterosulcoid with ostium larger than cauda and both becoming deeper as otolith size increases; opening ostio-caudal. Colliculum poorly developed, collum distinct and broad. Crista superior poorly developed; crista inferior well formed and broad, extending onto rostrum and pseudo-rostrum. Rostrum broad and rounded, but poorly developed in smaller otoliths. Antirostrum small and rounded distally, although absent in smaller otoliths. Pseudo-rostrum similar in size to rostrum where developed. Excisura wide; notch deep; angle wide. Dorsal area reduced. Ventral area with slightly sculptured groove following line of ventral margin, bordered by a robust ridge above and distinct depressions anteriorly and posteriorly. Note: Considerable variation exists in otolith morphology with growth for this species. Larger individuals develop otoliths greater in height than length, with both anterior and posterior rostral-like projections.

0 0

Post a comment