Otolith description

Otolith hour-glass shaped. Dorsal margin lobed; ventral margin lobed to dentate on medial section; posterior margin and anterior margin entire. Distal and proximal surfaces flat to uneven. Sulcus groove deep, homosulcoid; opening ostio-caudal. Colliculum homomorph. Collum broad and bridge-like. Crista superior indistinct; crista inferior distinctive especially along mid-region of sulcus. Rostrum and pseudo-rostrum broad with sharply rounded end. Antirostrum and pseudo-antirostrum broad and bluntly rounded. Excisura usually deeper and with a more acute angle than pseudo-excisura. Dorsal area depression fan-shaped, originating above collum. Ventral area depression absent; ill defined groove present.

Otolith of Cyttus australis from a fish of 145 mm TL
0 0

Post a comment