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Pneumoderma peroni (Cuvier, 1817) forma peroni (Cuvier, 1817)

Overview

This is a naked pelagic snail, up to 1.5 cm long, with a semi-transparent body, the visceral mass is seen through the body wall. The wings are small, the posterior footlobe is large, rounded oval in shape. There are two lateral arms, each with 80-100 suckers of a similar type. It hunts zooplankton, and lives in tropical waters of all oceans at shallow depth (Pneumoderma p. peroni).

Taxonomic Description

The body is bluish. The general body shape is as in Pneumoderma atlanticum, somewhat compressed. Lateral gill with fringed lateral somatic crests. Posterior gill with long radiating crests, each with about 12 continuous fringes; fringes are usually absent on the quadrangular crest (Pneumoderma p. peroni line drawing). In some specimens this quadrangular part is greatly reduced. Acetabuliferous arms triangular, each with 80 to 100 small subequal suckers. The radula formula is 4-0-4. The median footlobe is short.
Body length up to 15 mm

Juveniles

A special description is not available.

Reproduction

This species is a protandric hermaphrodite.

Ecology

This species is a carnivore.

Distribution

Its distribution is incompletely known. It seems to deeply penetrate the Red Sea and Arabian Gulf, and it is also known from the Indo-Malayan and Atlanto-Mediterranean waters, see the Pneumoderma p. peroni map. The forma heterocotylum is only known from its type locality.

Types

Pneumodermon peronii Cuvier, 1817: 381.
Types not found in MHNP they were probably never indicated.

Pneumoderma peroni peroni