Resumen de Stereoscopic study of the ocular sinuses of some ostracoda.

Mervin Kontrovitz, Zhao Yuhong

• This is the first publication using scanning electron stereographs of the ocular sinuses of ostracodes; it shows the true spatial relationships of the structures in nine well-known trachyleberid species. The ocular sinus is a channel-like feature that is situated between the ocular pit and the inner surface of the eyespot. The sinus is stalk-shaped in marine podocopids and consists of: 1) the base, which is the portion in the ocular pit; 2) the cup, the bulbous distal end; and 3) the neck, which lies between the base and the cup. The cup has a marginal rim marked by a distinct anterior lobe, one or two higher posterior lobes, and a shallow depression contained by the rim; this arrangement seems to be diagnostic of the Trachyleberididae. The stereographs further reveal that the subcentral depression may have secondary topography.