[3] Its genus name vomeridens is a reference to the teeth on the vomer while the specific name infuscipinnis is a compound of infuscus meaning "dark brown" and "pinnis" which means "finned", a reference to the colour of the caudal fin.

[5] Vomeridens is found in the Southern Ocean where it is known to occur in the Weddell and Ross seas, the South Orkney Islands and the Antarctic Peninsula.

[5] They have a reduced amount of bone and a high percentage of cartilage and lipids in their bodies which gives them near neutral buoyancy.

This reduced body density means that this species probably forages in the water column, hovering over the substrate.

Sampled stomach contents were wholly made up of krill (Euphausia superba), with some of these being 46 to 50 mm (1.8 to 2.0 in) in length.