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It does have it's own field it is called Entermology.
i think its both. . aschelminthes is the same as nemathelminthes
L. A. Borradaile has written:
'The animal and its environment'
'A manual of elementary zoology'
'The invertebrate'
They are Nemathelminthes
Paul Allen Meglitsch has written:
'Invertebrate zoology' -- subject(s): Invertebrates