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Pneumoderma atlanticum (Oken, 1815) subsp. atlanticum (Oken, 1815) forma eurycotylum Meisenheimer, 1905c


This is a small naked pelagic snail, up to 0.6 cm long, with a semi-transparent body, the visceral mass is seen through the body wall. It is oval to conical in shape. There are two lateral arms each with 30 suckers. It is a good swimmer that hunts zooplankton as food and lives in the S-Atlantic Ocean (Pneumoderma a.a. eurycotylum).

Taxonomic Description

Lateral and posterior footlobes are well developed, lateral ones long, posterior one rounded. Lateral gill with long lateral and medial folds but without fringes. Posterior gill with four relatively long branches with clear fringes. Each acetabuliferous arm bears 16 to 20 suckers. In larger specimens 25 to 30 long stalked suckers can be present, these being arranged in two rows along the arm. The basal suckers are larger than the lateral ones. Radula formula 4-1-4, the median plate seems to persist in older specimens.
Body length up to 6 mm.


A special description is not available.


This species is a protandric hermaphrodite.


This species is a carnivore.


It is known from the S-Atlantic Ocean as shown in the Pneumoderma a.a. eurycotylum map. The forma pygmaeum seems widely distributed, while only two records in the TAC centre are known for the forma bonnevii.


Pneumoderma eurycotylum Meisenheimer, 1905: 51 + fig.
Holotype: HMEB 61147 (alcohol collection) (Dr. Kilias in let.) u.s.
Type locality: 2°37'N 3°28'E. Coll.: CVDE, stat. 55.

Pneumoderma atlanticum atlanticum eurycotylum