Olmstead, Wendy (2012) Bivalvia (class of phylum mollusca). White Word Publications, Delhi, India. ISBN 9788132340966
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Abstract
Bivalvia is a class of marine and freshwater mollusks known for some time as Pelecypoda, but now commonly referred to simply as bivalves. As with Gastropoda and Cephalopoda, the term Pelecypoda is in reference to the animal itself while Bivalvia simply describes the shell. Other names for the class include Acephala, Bivalva, and Lamellibranchia. The total number of bivalves currently amounts to 9,200 species in 1,260 genera and 106 families. The global marine bivalves (including brackish water and estuarine species) contain about 8,000 species, combined in 4 subclasses and 99 families with 1,100 genera. The largest recent families are Veneridae with more than 680 species or Tellinidae and Lucinidae with over 500 species. The freshwater bivalves have 7 additional families, of which the Unionidae contain about 700 species. Bivalves have a shell consisting of two asymmetrically rounded halves called valves that are mirror images of each other, joined at one edge by a flexible ligament called the hinge. The shell is typically bilaterally symmetrical, with the hinge lying in the sagittal maya to 1,532 mm in Kuphus polythalamia plane.
| Item Type: | Book |
|---|---|
| Subjects: | Q Science > QL Zoology |
| Divisions: | Electronic Books |
| Depositing User: | Esam @ Hisham Muhammad |
| Date Deposited: | 02 Jan 2023 01:26 |
| Last Modified: | 02 Jan 2023 01:26 |
| URI: | http://odlsystem2.utm.my/id/eprint/3830 |
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