Pseudoceros have a distinctive anterior folding of the body to make 2 tentacles known as "false horns".

The left eye of the larval stage is composed the same with the exception of an additional sensory cell containing multiple cilia.

Pseudoceros canadensis are simultaneous hermaphrodites that use a form of hypodermic insemination known as penis fencing to determine which breeding partner is the female, and which is the male.

[9] It lives within the range of the Puget Sound, which is an inlet in the Pacific Ocean located along the northwestern coast of the US state of Washington, and British Columbia (Northwesternmost Province of Canada).

In the Muller's larval stage they have been found to eat microalgae using ciliary beat reversal to alter near-field flow and draw in food particles toward the mouth.