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Clio pyramidata Linnaeus, 1767 forma martensi (Pfeffer, 1880b)


This is a transparent uncoiled shelled pelagic snail, up to 1.7 cm long. The shell is elongate triangular in shape. The reddish, or dark brown visceral mass is shining through the shell wall. It is a good swimmer that feeds on phytoplankton and protozoa. It lives in the Subantarctic but it is not common (Clio p. martensi).

Taxonomic Description

The caudal part of the shell is short and similar to the forma pyramidata. The lateral ribs do not project laterally, nor are they pronounced. The middle part of the shell has a convex profile; the cranial part with the sharper lateral ribs, has straight, somewhat diverging lateral sides. The dorsal surface usually has five ribs which are less developed than in the forma pyramidata, while the transverse striation, even on the ventral side, is more distinct. The whole shell is curved slightly ventrally.
Shell measurements: up to 17 mm long and 9 mm wide.


A special description is not available.


This form is a protandric hermaphrodite.


This is a phytophage form.


Cleodora martensii Pfeffer, 1880: 95, fig. 16.
Lectotype: HMNH (alcohol collection. Paralectotypes: HMNH, 16 spec. (alcohol collection).
Type locality: Atlantic Ocean (restricted). Coll.: Schm? No. 415. The lectotype is slender shaped as figured by Pfeffer (1880) but most of the paratypes are more similar in shape to the forma sulcata.

Clio pyramidata martensi