Pseudobiceros fulgor, also known the lightning worm, is a species of marine flatworm from the family Pseudocerotidae and belongs to the class Turbellaria. These flatworms are commonly found in the tropics of the Indo-Pacific region. They can be found in shallow coral reef environments.

Pseudobiceros fulgor like all flatworms, are triploblastic, meaning 3 germ layers present during development. These organisms are also acoelomate, lacking a body cavity between their gut and body wall. Pseudobiceros fulgor are bilaterally symmetrical, this helps to aid in their movement and navigation in their environment. During embryonic development stages they undergo mostly spiral cleavage. This influences the organization of their cells during development.

...