A comparative study of the field populations of Crepidula lingulata, Crepidula nurnmaria, and Calyptraea fastigiata indicated all three preferred a rocky substrate but favored different size rocks. Their positions on the rocks varied but the greatest numbers were found attached to the undersides. Crepidula lingulata and C. nummaria preferred larger rocks and were found in intraspecific associations more often than C. fastigiata which preferred smaller rocks. These associations occurred with a 1:1 sex ratio; however, the overall population did not. Crepidula lingulata had a high female count and C. fastigiata a high male count. Males, of all three species, were smaller in size than females. Leptasterias hexactis and Evasterias troschellii were found to be possible predators. Protection was afforded those attached to the undersides of rocks. All three species used the radula to remove irritants from under the shell including the tube feet of attacking sea stars.
College and Department
Plant and Wildlife Sciences
BYU ScholarsArchive Citation
Goodwill, Roger Harold, "A comparative study of some population characteristics of Calyptraea fastigiata Gould, Crepidula lingulata Gould, and Crepidula nummaria Gould (Gastropoda, Prosobranchia)" (1975). Theses and Dissertations. 7935.