Elysia maoria

Elysia maoria is a small, green sea slug that lacks a shell and is characterized by its oval shape. This species belongs to the family Plankobranchidae and can reach lengths of about 25-26 mm when fully grown. It is primarily found in the temperate waters of New Zealand, inhabiting benthic zones along shorelines, typically at depths ranging from 0 to 5 meters. Elysia maoria often resides on Codium, a common green alga, where it lays its eggs and makes its habitat. This species is an herbivore, using its radula to suck fluids from algae for nourishment. However, it is not confirmed whether Elysia maoria can perform kleptoplasty, a process seen in some related species where they retain chloroplasts for photosynthesis.  Reproduction in Elysia maoria involves males hypodermically impregnating females, with fertilized eggs developing in long ribbons that protect the larvae until they hatch approximately two weeks later. Males reach sexual maturity before females, and their unique mating behavior includes the use of a specialized penis that lacks a hollow spine, raising questions about its functionality. Encounters with Elysia maoria during dives may reveal these creatures gliding gently over algae-covered surfaces, showcasing their distinct movement patterns. The conservation status of this species has not been evaluated by the IUCN.