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Cavolinia gibbosa (d'Orbigny, 1836) forma plana Meisenheimer, 1905c

Overview

This is a relative flat shelled pteropod, about 1 cm long (this is the only difference with f. gibbosa). The transparent shell has a reddish tinge. The lateral spines are very small, the caudal spine is pronounced, as is the upper shell lip. It lives in the surface layers of the Indo-Pacific Ocean. It is a phytophagous mucus feeder (Cavolinia g. plana).

Taxonomic Description

The ventral shell side is extremely flat. The compression of the shell renders the edge of the ventral side closer to the aperture and sharper. The dorsal shell lip is less developed than in the forma flava. The caudal spine is slightly curved dorsally. The longitudinal ribs on the dorsal side are less developed than in the forma flava.

Juveniles

A special description is not available. It is doubtful if really full grown specimens are found in this form, probably only juveniles are concerned.

Reproduction

This form is a protandric hermaphrodite.

Ecology

This form is phytophagous and epipelagic.

Distribution

It is found incidentally in all oceans, but most frequent in the Indo-Pacific. The data are too incomplete to present a map.

Types

Cavolinia gibbosa var. plana Meisenheimer, 1905: 32, pl. 1, fig. 2
Type: not present in HMEB.
Type locality: 10°8'S 97°15'E. Coll.: CVDE stat. 182.

Cavolinia gibbosa plana