Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
Compare and contrast the morphological features of Lamellibranches and Brachiopods
Member rating: No Rating | Words: | Submitted: Wed Feb 02 2005
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
Joe Dickinson L6MD Compare and contrast the morphological features of Lamellibranches and Brachiopods Brachiopods can be split into two classes: articulate and inarticulate. . Articulate brachiopods have calcerous shells hinged by teeth and sockets, whereas Inarticulate brachiopods have horn-like shells made from a protein called chitin, and their valves are not hinged by teeth and sockets. In Brachiopods the shell consists of two hinged halves, a dorsal pedicle valve and a ventral brachial valve. The line where the two halves of the shell join is called the Commissure. The two valves often differ in size, thickness, and form. In life position either of the valves may be uppermost (furthest from sediment) or largest, but the plane of the commissure is always sub parallel to the sediment surface. In articulate Brachiopods the pedicle valve has a small hole at its posterior end, through which the pedicle emerges. The inner surface of...
Get instant access
- Instant, unlimited access to our documents in full
- Swap your work for free access, or pay £4.99
- To see the full version of this document and 151,713 others
