As nouns the difference between invertebrate and gregarine
is that invertebrate is an animal without vertebrae, ie backbone while gregarine is any of various sporozoan protozoans, that are parasitic in the digestive tracts of some invertebrates.
As an adjective invertebrate
is lacking a backbone.
gregarine
English
(Gregarinasina)
(Gregarinia)
Noun
(
en noun)
Any of various sporozoan protozoans, that are parasitic in the digestive tracts of some invertebrates.