BIOL-K - Biology BIOL-K 103 Lecture Notes - Lecture 2: Gastrovascular Cavity, Cephalic Disorder, Radula
27 Apr 2016
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Phylum covered in lab: covered in lab, questions will be on lab and lecture. Protostomia: lophotrochozoa, ciliated larva or ring around mouth, ecdysozoa, animals that shed outer covering, ancestral features, bilateral symmetry, triploblastic, protostomic development. Flatworms (phylum platyhelminthes: ancestral features plus, acoelomate, organ level, nervous system, simple, two masses of nervous tissue (ganglia) connected to two nerve cords. Sense organs: include simple eyespots and organs of balance (statocysts orientation, gastrovascular cavity, no organs for circulation or gas exchange. Four classes: free living, turbellaria (only free-living flatworms, planarian observed in lab, parasites, trematoda (flukes, monogenea (flukes, cestoda (tapeworms) Class gastropoda: members snails, slugs, conchs, sea slugs, and relatives, habitat freshwater, salt water, terrestrial. Body: torsion twisting of visceral mass (shell twisting evolved separately, head well developed with tentacles in most, two eyes on stalks may extend from head. Respiration: pulmonate mantle functions as lungs, gills are aquatic. Cone shells radula equipped with poisonous barbs.
