As nouns the difference between polychaete and siboglinid
is that polychaete is while siboglinid is (biology) any polychaete annelid worm of the family siboglinidae .
As an adjective siboglinid is
characteristic of these creatures.
siboglinid
English
Noun
(
en noun)
(biology) Any polychaete annelid worm of the family Siboglinidae