STUDY SHEET - Phylum Mollusca Eucoelomate = True coelome...

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Phylum Mollusca – Eucoelomate = True coelome includes deutorosomes(entercoelomeates and protosomes (schizoceoleomates) Protostome= annelids, moluscs, arthropods…. .schizoceolomes trochophore larva = larval stage of mollusks…relates to some annelids because they also have trochophore larva head-foot = part of mollusks visceral mass = part of mollusks mantle = part of mollusks, secrets shell 3 parts of shell = pariostracum, prismatic, and nacreous….pearl forms between prismatic and nacreous layer mantle cavity shell (3 layers), radula = rasping tongue, part of digestive system gills = lung = open circulatory system (except Cephalopods) = blue hemocynin instead of red hemoglobin countercurrent exchange = water flows one way (along gills) while blood flows the other; increases concentration gradient Gastropoda (snails, slugs, nudibranchs, etc.), Torsion = moving head next to anus; for safety Fouling = what happens after torsions, so it moves its head to one side…anus to other, can lose a gill Coiling = what happens to the shell as growth occurs Bivalves: mussels, clams, scallops, oysters, suspension feeders = aka filter feeders…. .capturing food particles suspended inw ater siphon = excurrent where water goes out, incurrect where water goes in…how they feed shell = hinge ligament = umbo adductor mussels = anterior (closer to umbo) and posterior; for opening and closing shell byssal threads = made by visceral glands; for attachment digestive gland = makes enzymes; part of digestive system crystalline style= a digestive gland that secrets enzymes labial palps = pushes food into mouth gills = trochophore = veliger = second stage of larva spat = baby oyster Cephalopods: Nautilus, squid, octopus, cuttlefish gas chambers = float chambers; for neutral buoyancy siphuncle = connected to gas chambers pen = endoskeleton (vestigial) funnel = siphon chromatophore = color pigments
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arms = 8 of them; suckers all over; used for movement and feeding tentacles = 2 of them; only suckers at bottom; used for movement and feeding beak = tears things apart radula= rasping tongue ink sac = protection and confusion closed circulatory system = blood pumped eyes = camera-like eyes Phylum Annelida - segmented worms Eucoelomate = true Protostome Setae = hair bristles on parapodia Parapodia = structure for locomotion, respiration, and sensory Prostomium = head shell Peristomium= area around the mouth; sometimes have jaws Jaws = Errant = Sedentary = atoke = no sexual organs epitoke = reproductive structure in polychaetes nephridia = excratory structure in each segment peristalsis = the way it moves’ long and circ muscles Polychaetes = have parapodia Earthworms (clitellum = secretes cocoon for sperm to flow and eggs to incubate, cocoon, dorsal blood vessel) - oligochate Leeches - Hirudinea, Suckers = posterior and anterior hirudin = chemical that coagulates blood
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This note was uploaded on 04/07/2008 for the course BIO 103 taught by Professor Potts-santone during the Spring '07 term at Northeastern.

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STUDY SHEET - Phylum Mollusca Eucoelomate = True coelome...

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