MOLLUSKS - 6/6/11 Protostome features: Mouth forms first...

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Unformatted text preview: 6/6/11 Protostome features: Mouth forms first 6/6/11 6/6/11 6/6/11 Embryonic Cleavage: Determinate (Protostomes) vs. Indeterminate (Deuterostome) In humans, the first few divisions are indeterminate. If cells in the embryo separate within the first divisions, the result is 6/6/11 body plan with three main parts: a muscular foot a visceral mass a mantle Phylum includes: snails and slugs, oysters and clams, and octopuses and squids Most are marine some inhabit fresh water and some are terrestrial soft-bodied animals Protostoma Phylum: Molluscs 6/6/11 Visceral mass Mantle Foot Coelom Intestine Gonads Mantle cavity Anus Gil l Nerve cords Esophagus Stomach Shell Radula Mouth Mouth Nephridium. Excretory organs called nephridia remove metabolic wastes from the hemolymph. Heart. Most molluscs have an open circulatory system. The dorsally located heart pumps circulatory fluid called hemolymph through arteries...
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MOLLUSKS - 6/6/11 Protostome features: Mouth forms first...

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