This species occurs in the Eastern Pacific Ocean, from Canada to Baja California, Mexico.

Mobile juveniles must choose long-term hosts, other animals, that minimize their chances of death.

[2] They prefer warm weather, and climate change has caused increase in population of C.

[3] The Crepidula adunca is a mollusk that relies on suspension feeding (filters food out of the water) and are hermaphrodites that brood their young.

C. adunca have dense patches of cilia around the mouth, near the head, located on the side between the tentacles, and on the foot, which develops before anything else.

Before all the features, the eyes are developed and seen first, then kidney cells are formed near the side of the ciliated mouth.

[1] For Crepidula species, the phallus of the organism usually becomes reaches full size when there is enough sperm to fill the spermatic vesicles, then it begins to outgrow its juvenile shell.

In the beginning of mitosis (the first two cell divisions) a polar lobe forms, which takes roughly 42 hours.

Once the cells are clear and the head and foot of the mollusc are not fully developed, a shell begins to grow over the embryo.

Once caught by the mucus, the cilia, known as ciliary action, carries the organisms to the mouth along the dorsal surface.