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Pneumodermopsis (Pneumodermopsis) paucidens (Boas, 1886a) forma pulex Pruvot-Fol, 1926


This is an extremely small, naked pelagic snail, up to 0.2 cm long, visceral mass is seen through the body wall. The skin has grayish chromatophores. There is a median sucker arm with five suckers. There are 14 equal sized suckers implanted on the buccal wall. A posterior gill is absent. The posterior footlobe is short (Pneumodermopsis p. pulex). It lives in the Atlantic and Mediterranean in shallow and deep water layers.

Taxonomic Description

Small, dark gray animals, no gills visible. Median arm with 5 suckers on long stalks. Lateral arms in a semi-circle with a total of 14 sessile suckers; the two anterior suckers on the lateral arm are nearly invisible. The median suckers are the largest. Radula formula 3-1-3. The hooks are extremely short, 5 to 6 in number, in rather shallow hook sacs. Typical differences with the forma paucidens are: a) no gills, b) smaller body length, c) more radula teeth, d) unequal size of the lateral suckers. Posterior footlobe pointed, rather long; lateral lobes narrow, but drawn out in length. Well developed specimens with juvenile as well as adult characters were at the disposal of Pruvot-Fol when she described this forma. The larvae the same size or even larger than the adult specimens, which is perhaps due to stagnation in feeding during transformation of the larval to the adult stage. Pruvot-Fol (1926) compared this phenomenon with similar processes in Paraclione longicaudata.
Body up to 2 mm long.


A special description is not available.


This form is a protandric hermaphrodite.


This form is carnivorous.


The forma pulex is found in the E-Atlantic Ocean, see the Pneumodermopsis p. pulex map.


Pneumodermopsis paucidens var. pulex Pruvot-Fol, 1926: 12, pl. 1, fig. 35, pl. 3
figs. 70, 71, 83, 84.
Lectotype: MOM (alcohol collection). Paralectotypes: MOM (alcohol collection) 1 spec., and 2 spec.
Type locality: 39°45'N 4°18'W; 36°29'N 2°3'W. Coll.: CPAE stat. 2692 and 2071.

Pneumodermopsis paucidens pulex