How well do you know your fossils?
Geologic Time Scale
Credits & Copyright
« Show all
Stratigraphic age range:
Pentamerus has no costae. It does however exhibit a fold and sulcus. A pedicle foramen is not visible nor are any growth lines. Refer to diagram and photos for shape. The shell is biconvex.
Copyright © 2004-2018
Unless otherwise specified, all images and data are free for non-commercial use (educational or individual).
Please see the
page for details.
If you find this website valuable/useful, please consider making a donation. Being an undergraduate student is very expensive!