Order Thecosomata Blainville, 1824
Thecosomata are usually shelled pteropods comprising the suborders Euthecosomata and Pseudothecosomata. (Thecosomata organisation).
The anatomy of this group is discussed under Clio p. lanceolata, Clio p. pyramidata and Limacina r. retroversa
[2 suborders]