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Bivalve speculum

a speculum with two adjustable blades.

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Original function of gills in bivalvia

So what might be the ancestor of the bivalves - would it have most likely used a gill for one or the other of those functions?

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by Darby
Tue Apr 20, 2010 7:34 pm
Forum: Zoology Discussion
Topic: Original function of gills in bivalvia
Replies: 3
Views: 2546


... within Ecology" was beaten into our heads in school. Think about corals competing for light and space on the reef with sponges, soft corals, bivalves and algae. Different kingdoms, phylums and orders all occupying and competing in the same space for the same or similar resources.

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by Endangered
Fri Jan 01, 2010 1:43 am
Forum: Ecology
Topic: niches?
Replies: 4
Views: 2705

Why do you keep talking about species

... Class: Echinoidea Sea Urchins, Heart Urchins and Sand Dollars Class: Holothuroidea Sea Cucumbers Phylum: Mollusca Molluscs Class: Bivalvia Bivalves Class: Cephalopoda Squids, Cuttlefishes, Octopus, Nautilus Class: Gastropoda Snails, Slugs Class: Polyplacophora Chitons Kingdon: Plantae Phylum: ...

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by gamila
Mon Jun 29, 2009 5:35 pm
Forum: Evolution
Topic: Why do you keep talking about species
Replies: 23
Views: 54196

Why are people so in love with tetrapods?

... big marine molluscs or echinoderms, they will also watch those keenly. But, they will never take a glance at any small molluscs like snails or bivalves. Neither will they be interested in indigenous species of birds or snakes. Contrary to them, the city (obviously Indian) folks show more interest ...

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by surajitkoley
Sun Jun 21, 2009 4:09 am
Forum: Zoology Discussion
Topic: Why are people so in love with tetrapods?
Replies: 4
Views: 8218


... that the other doesn't and this characteristic developed after the two diverged from their common ancestor. In the case of mollusca, bivalves (clams) are considered to be more advanced than the highly intelligent cephalopods (including squid and octopods) because of their more recently ...

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by plasmidmap
Wed Apr 19, 2006 4:59 am
Forum: General Discussion
Topic: Jussthink!
Replies: 14
Views: 7336
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