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Cavolinia uncinata (Rang, 1829a) subsp. pulsatapusilla Van der Spoel, 1971a forma pulsatoides Van der Spoel, 1971a

Overview

This is a large uncoiled thecosomatous pteropod, 0.8 cm long. It has a flat dorsal side with moderately developed ribs. There is band at the base of the ventral lip. The caudal spine is curved and relatively long. The ventral side is clearly vaulted. Shell sculpture consists of faint growth lines and transverse striation near the aperture and the shell surface has a strongly hammered structure. The dorsal lip curves over the aperture. Micro-zooplankton and phytoplankton are its food and it is a mucus feeder. It lives in the Red Sea, at shallow and moderate depths (Cavolinia u.p. pulsatoides).

Taxonomic Description

The ventral lip is preceded by a band which is not level with the ventral surface. The distance between the lateral spines is relatively large, the caudal spine is short and heavily curved dorsal. The line between the tips of the lateral and the caudal spines is regularly curved. There are about 7 transverse lines on the ventral side.
Shell length 6 to 7.5 mm shell width 4.8-5.8 mm.

Juveniles

A special description is not available.

Reproduction

This forma is a protandric hermaphrodite.

Ecology

This forma is phytophagous.

Distribution

This forma is only found in the Gulf of Aqaba (Red Sea), see the Cavolinia u.p. pulsatoides map.

Types

Cavolinia uncinata pulsatapusilla forma pulsatoides Van der Spoel, 1971: 12, fig. 12.
Holotype: DZTU (dry collection).Paratypes DZTU 4 spec. (dry collection).
Type locality. Near Elath Col. NS. 5967 Dr. Ch. Lewinsohn.

Cavolinia uncinata pulsatapusilla pulsatoides