Description

Description Sagittae quite large, one specimen exceeding 18 mm in length. Outline sub-elliptical; height / length ratios approximately 50 – 60 %. Margins smooth; anterior margin very short, slightly arched. Dorsal margin almost straight, slopes downward anteriorly and posteriorly. Small, low posterodorsal dome forms highest point on dorsal margin. Posterior margin very short, subtruncate, bluntly pointed. Posteroventral margin short, almost straight, slightly curved inward or outward. Ventral margin very broadly rounded. Anteroventral margin almost straight, forms small, obtuse angle with anterior margin. Inner face conspicuously convex and twisted. Prominent sulcus developed in dorsal and posterior regions. Sulcus very long, extending from anterodorsal margin to posteroventral margin. Sulcus indistinctly divided, with downturned and flexed posterior. Ostium wide, long; length twice that of cauda. Ostium filled with colliculum, only slightly excavated. Ostium opens onto anterodorsal margin. Cauda with anterior sub-horizontal portion and posterior downturned portion. Anterior cauda separated from the cauda by a thickening and roughening of collicular material. Anterior cauda slightly excavated, posterior deeply excavated. Posterior cauda reaches posteroventral margin. Caudal keel present. Crista superior well developed, occurs as broad, raised ridge above cauda. Crista inferior absent. Ventral furrow not developed. The outer face concave, twisted, thin toward anterior, thickest in posterodorsal. Annual rings almost always visible on outer face.

Common Names

Taxonomic Hierarchy

Kingdom: Animalia

Phylum: Chordata

Order: Albuliformes

Family: Albulidae

Genus: Albula

Species: Albula spec Scopoli, 1777