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Are bivalves coelomates?
Although molluscs are coelomates, the coelom tends to be small. The generalized mollusc has two paired nerve cords, or three in bivalves. The brain, in species that have one, encircles the esophagus.
Do clams have a coelom?
Clam (bivalve) Anatomy: Circulatory – The heart of a clam lies just below the hump of the shell within the pericardial cavity (Figure 10), the only remains of the coelom. Therefore, the coelom of the clam is said to reduce. Digestive – The clam is a filter feeder.
What class do bivalves belong to?
Class Bivalvia
Bivalves: Phylum Mollusca, Class Bivalvia. Clams, mussels, oysters, and scallops are members to the class Bivalvia (or Pelecypodia). Bivalves have two shells, connected by a flexible ligament, which encase and shield the soft vulnerable parts of the creature.
Are mollusks Acoelomate?
The protostome coelomates (acoelomates and pseudocoelomates are also protostomes) include the mollusks, annelids, arthropods, pogonophorans, apometamerans, tardigrades, onychophorans, phoronids, brachiopods, and bryozoans.
Are cephalopods Coelomates?
Animals in the phylum Mollusca include clams, snails, octopuses, and sea slugs (pictured right). They are all protostome coelomates. Class Cephalopoda includes octopuses, squid (right), cuttlefish, and chambered nautiluses.
Are bivalves cephalized?
For example, bivalves are not particularly cephalized (although some scientists have argued that they are “all head”). However, as with the echinoderms, certain mollusks regained cephalization. Their sense organs, including well-developed eyes and a brain, are concentrated in a distinct head region.
Are bivalves Cephalized?
Why are clams called bivalves?
Clams and their relatives (oysters, scallops, and mussels) are often called bivalves (or bivalved mollusks) because their shell is composed of two parts called valves. Bivalves have a long history.
Why are bivalves called bivalves?
Are cephalopods coelomates?
Are platyhelminthes coelomates?
Flatworms are hermaphroditic and capable of sexual and asexual reproduction. Their bodies have only a single opening, which serves as both a mouth and an anus. They are, as their name implies, flat. They have no circulatory system or body cavity (coelom), but they do have an excretory and digestive system.