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Notobranchaea macdonaldi Pelseneer, 1886b morpha pelseneeri Pruvot-Fol, 1942

Overview

This is a small naked pelagic snail, up to 0.5 cm long, with an opaque body; the visceral the organs may be seen through the body wall. The anterior tentacles are small. There are two pairs of buccal cones. The posterior gill has four crests. It is a good swimmer that hunts zooplankton, living in the N-Atlantic and Indo-Malayan waters (Notobranchaea m. pelseneeri).

Taxonomic Description

This morpha is poorly described. The type material was not properly designated and consisted originally of a large number of syntypes. But it seems correct to consider this morph as a smaller, earlier sexually mature group. The most characteristic structure seems to be the posterior gill which shows four radiating crests (Notobranchaea m. pelseneeri drawing). The buccal organs are ciliar in structure to those in the type morpha except for the number of lateral teeth which varies between 9 and 12. There is a tendency in the median plate to grow larger.
Body length up to 5 mm.

Juveniles

A special description is not available.

Reproduction

This form is a protandric hermaphrodite.

Ecology

This form is a carnivore.

Distribution

This form occurs in the N-Atlantic and Indo-Malayan waters, see the Notobranchaea m. pelseneeri map.

Types

Notobranchaea macdonaldi var. pelseneeri Pruvot-Fol, 1942: 37, figs. 43, 47-53
Lectotype: ZMUC (alcohol collection). Paralectotypes: ZMUC, 21 spec. (alcohol collection).
Type locality: restricted to 37°40'N 16°00'W. Coll.: CDAE, stat. 1377iv.

Notobranchaea macdonaldi pelseneeri