Ingolfiellidea is a small

suborder Order ( la, ordo) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and ...

of amphipods with only two families,

Ingolfiellidae Ingolfiellidae is a family (biology), family of Amphipoda, amphipod crustaceans, comprising the following genera: *''Ingolfiella'' Hansen, 1903 *''Proleleupia'' Vonk & Schram, 2003 *''Rapaleleupia'' Vonk & Schram, 2007 *''Stygobarnardia'' Ruffo, ...

and

Metaingolfiellidae ''Metaingolfiella'' is a monotypic genus of crustaceans Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, c ...

. They are small,

vermiform Vermiform (ˈvərməˌfôrm) describes something shaped like a worm. The expression is often employed in biology and anatomy to describe usually soft body parts or animals that are more or less tubular or cylindrical. The word root is Latin, ''ve ...

(worm-like) animals that live "in the soft mud of the deep-sea floor, as well as in high mountain freshwater river beds, or in subterranean fresh, brackish and marine interstitial waters of continental ground waters and continental shelves".

References

Amphipoda Arthropod suborders {{Amphipod-stub