Mollusks.

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Phylum: Mollusca Mollusks are soft-bodied animals that usually have an internal or external shell.

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Presentation transcript:

Mollusks

Evolutionary Advancement: The Coelom (true body cavity) Definition: Mollusks are invertebrates with a soft, unsegmented body often enclosed in a hard shell Evolutionary Advancement: The Coelom (true body cavity) Enables the muscles to be separated from the gut so that digestion of food is not hindered by muscle contraction for movement A coelom provides a space where the circulatory system can transport blood

Class: Gastropoda

Characteristics: Most gastropods have a single shell, a head, and are motile. Conch; conch fritters – blowing conch

Respiration occurs by gas exchange through the lining of the mantle cavity – must be kept moist. Avoids dessication by retreating into shell and sealing it off with a mucous plug. Radula, ribbon like membrane with tiny teeth pointing backwards – allows food to be chewed before eaten

Slug – gastropod without a shell Slug – gastropod without a shell. Aquatic gastropods have gills within their mantle.

Class: Bivalvia scallop

Giant clam Characteristics: Most bivalves have two shells, no head, and are sessile.

Bivalves use siphons to feed Reproduction: sexual like sponges, release sperm and egg into water

Class: Cephalopoda

Characteristics: Most cephalopods have no shell, a head, and are rapid swimmers. Cuttlefish

Closed circulatory system

jaws on mouth of octopus

Largest brain of any invertebrate

Giant squid in battle with a baby sperm whale as described by fisherman in 1966. The squid won. Giant squid is largest invertebrate known (over 25 feet).