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Dictionary » B » Bivalve

Bivalve

Bivalve

1. (Science: marine biology) a mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, or by one, as in the oyster. See mollusca.

2. (Science: botany) a pericarp in which the seed case opens or splits into two parts or valves.

Origin: f. Bivalve; bi- (L. Bis) _ valve valve.


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What kind of shellfish is in this coal gangue fossil?

Looks like a limpet to me, not a bivalve. Don't know about the golden layer.

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by wbla3335
Fri Mar 09, 2007 3:08 pm
 
Forum: Evolution
Topic: What kind of shellfish is in this coal gangue fossil?
Replies: 4
Views: 1092

What kind of shellfish is in this coal gangue fossil?

I'm no expert but it looks kind of like an echinoderm or a bivalve... good luck :/

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by AstusAleator
Mon Mar 05, 2007 2:07 am
 
Forum: Evolution
Topic: What kind of shellfish is in this coal gangue fossil?
Replies: 4
Views: 1092

Help figuring out what animals these are.

... which are in a different class. 3 has to be a bigger group (since it includes clams and mussels) than 2 (which is just a species), and bivalve shells are not really "exoskeletons." And what is it with tardigrades? This is the fourth discussion of them I've run into this week!

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by Darby
Tue Jun 20, 2006 4:44 pm
 
Forum: Zoology Discussion
Topic: Help figuring out what animals these are.
Replies: 11
Views: 2458

Organisms

Isn't a tadpole considered a larval stage? Clams only have gills because they are bivalves and no bivalve has lungs. If they breathe out of water they probably have some way of keeping their gill area moist. Also, clams don’t have a very well developed digestive ...

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by February Beetle
Mon Apr 17, 2006 8:00 pm
 
Forum: Zoology Discussion
Topic: Organisms
Replies: 29
Views: 4130

Moluscus and Arthropods

... either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve. Formerly the Brachiopoda, Bryzoa, and Tunicata were united with the Lamellibranchiata in an artificial group called Acephala, ...

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by kandarp shah
Sun Jul 17, 2005 5:45 pm
 
Forum: Zoology Discussion
Topic: Moluscus and Arthropods
Replies: 6
Views: 5981
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