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PBHS Zoology Ch 16

Phylum Mollusca

QuestionAnswer
largest phylum after Arthropoda, ~50,000 living species Phylum Mollusca
examples of large mollusks Architeuthis & Tridacna gigas
mollusks have _______________ symmetry bilateral
mollusks are classified based on the shape and purpose of this organ which is used mostly for locomotion foot
this organ secretes the shell of the mollusk mantle
mollusks contain a true __________ which is a body cavity coelum
many mollusks have a sharp harpoon-like rasping organ called a ________ radula
this class of mollusks have oval shells that lie close to the rock ... they scrape food off of the rock with the radula, chitons are the most common name Polyplacophora
most common Polyplacophora chiton
this class have tooth-shaped shells and mostly live at very deep depths Scaphopoda
this class of Mollusk has both shelled (snails) and unshelled (slugs) forms Gastropoda
largest and most diverse class of mollusks Gastropoda
an example of a genus of Gastropod from the survey lab Helix
this class of Mollusk has two shells Bivalvia or Pelecypoda
the name Pelecypod means __________ hatchet foot
Bivalves have no _____________________ which means they have no head cephalization
this class of Mollusk has an internal shell, tentacles, is known for its intelligence Cephalopoda
Phylum Playhelmenthese consists of different versions of ______________worms flat
Phylum Nematoda consists of different versions of ______________worms round
the most well-known members of both Phylum Platyhelminthese and Nematoda are ____________ parasites
this class of flatworms are leaf-shaped and have varieties that live on most internal organs flukes or Class Trematoda
this class of flatworm have hooks instead of mouths, proglottids (body segments) that have both sex organs tapeworms or class Cestoda
this class of flatworm is mostly non-parasitic, lives in in both freshwater and marine water planarians or class Turbellaria
common in SE Asia, the liver fluke, can get from undercooked fish Clonarchis sinensis
blood flukes cause this disease, ~200 million people worldwide, passed in water via feces/urine Schistosomiasis
many flatworms do not have a ________________ ... they absorb food through their skins digestive system
clam dissection: pointy part of the outer shell umbo
clam dissection: concentric circles on shell growth rings
clam dissection: large central 'hatchet-shaped' organ foot
clam dissection: attached to the inner parts of the shell, secretes the shell mantle
clam dissection: flat flaps of skin on either side of the foot, used for gas exchange (breathing) gills
clam dissection: small flaps on either side of the mouth labial palps
clam dissection: green internal organ digestive gland
clam dissection: two large attachment organs adductor muscles
Created by: kcshiker