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It does have it's own field it is called Entermology.
An aspidobranch is a member of the Aspidobranchia, an order of sea snails.
L. A. Borradaile has written:
'The animal and its environment'
'A manual of elementary zoology'
'The invertebrate'
Paul Allen Meglitsch has written:
'Invertebrate zoology' -- subject(s): Invertebrates
Malacology is branch of study within the area of invertebrate zoology. Specifically this branch deals with the study of aquatic mollusks.