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Most species of Grimpoteuthis are poorly known. They are somewhat less compressed in the anterior-posterior axis than are members of Opisthoteuthis and they generally have relatively larger fins. Species are closely associated with the deep-ocean floor and some species, at least, alternate between sitting on the ocean bottom and swimming above it while some others apear to be completely pelagic.
- without enlarged sucker fields on arms of males.
- Areolae absent.
- Optic lobe circular in cross-section.
- One optic nerve bundle penetrates white body.
- Shell U-shaped or slightly W-shaped.
- Sucker aperature without tooth-like structures.