Halicryptus

Halicryptus is the sole genus of its class of priapulid worms, and grows to great size. It has an important effect on the structure of soft-sediment communities.

This genus contains the following species:
 * Halicryptus higginsi
 * Halicryptus spinulosus - type species

Maximum trunk length of Halicryptus spinulosus is 40mm, but usually belov 25mm. Halicryptus higginsi can reach 385mm.