Identification:
This variant of Pseudobiceros kryptos—form B—stands out with its deep green to maroon coloration, often enhanced by subtle iridescent hues visible under torchlight. The body is long and oval, bordered by a finely scalloped cream or darker margin, and the dorsal surface may be slightly velvety in texture. Unlike form A, this one lacks clear longitudinal lines and appears more uniform, giving it a more cryptic appearance on the reef.

Size:
Usually measures around 3 – 6 cm in length.

Habitat:
Frequently observed crawling on dead coral, rubble, or sandy bottoms, especially around shallow reef zones and lagoonal areas.

Depth Range:
1 – 15 meters

Diet:
Likely feeds on colonial ascidians or small sessile invertebrates, though direct feeding has rarely been observed.

Reproduction:
As with many polyclads, this species is a simultaneous hermaphrodite and practices penis fencing, in which two individuals attempt to inseminate each other in a brief but intense duel.

Fun Fact:
The species name kryptos comes from the Greek word for “hidden,” referring to the worm’s camouflage skills and elusive behavior—traits perfectly embodied by this reddish variant.