Location
Luzon Island, Philippines
Caption
The white projections from the arm stalks in this closeup view are called pinnules. This crinoid has its arms retracted. Though many may feed during daylight hours, crinoids normally are nocturnal, and commonly keep the arms in a retracted position during the day. The tiny cilia lining the pinnules are also retracted and not visible in this photo.
Contributors
To cite this page: Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2012. The Animal Diversity Web (online). Accessed at http://animaldiversity.org.
Disclaimer:
The Animal Diversity Web is an educational resource written largely by and for college students. ADW doesn't cover all species in the world, nor does
it include all the latest scientific information about organisms we
describe. Though we edit our accounts for accuracy, we cannot guarantee all
information in those accounts. While ADW staff and contributors provide
references to books and websites that we believe are reputable, we cannot
necessarily endorse the contents of references beyond our control.
