I'm writing a paper about Mollusca for my school. I'm making an overview of
the variety in this group on the level of order. I have done most of it
already but I have a problem in the Gastropods. Is there anybody who can
tell me the differences between the orders in Opisthobranchia and Pulmonata?
Are the orders which I already named correct?

Opisthobranchia: Cephalaspidea, Acochlidioidea, Sacoglossa, Anaspidea,
Notaspidea, Thecosomata, Gymnosomata, Nudibranchia en Gymnomorpha.
Pulmonata : Achaeopulmonata, Basommatophora en Stylommatophora.

Kevin Monsecour
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