BIO LAB FINAL 237 cards

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Platyhelminthes

flatworms, includes large group of acoelomates

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classes of Platyhelminthes

Turbellaria Cestoda Trematoda

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scolex

small anterior knob of platyhelminthes

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proglottids

tab-like units or platyhelminthes

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ocelli

eyespots on head of Dugesia (platyhelminthes)-light sensitive

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intestinal branches

three dye-filled structures of Dugesia

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pharynx

faintly yellow structure, protudes through ventral opening of Dugesia and draws food into intestine

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incomplete digestive tract

no anus, just mouth; planarians have this

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lateral nerve cords

obscured near large dark intestine of dugesia

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hermaphroditic

monoecious

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vas deferens

sperm of tapeworms travel through it to get to the genital pore.

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yolk gland

adds nutritious material to zygote and then it is enclosed in shell stored in the uterus

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phylum annelida

includes a large variety of elongate worms that are distinguished from other worms by true segmentation;eucoelomate

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selected characteristics of annelida

1. bilaterally symmetrical, segmented, worm-like 2. fluid-filled eucoelum, hydrostatic skeleton 3. setae usually present 4. closed cirulatory system 5. complete digestive tract 6. metanephridia, seves as excretory organs

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classes of Annelida

Oligochaeta, Polychaeta, Hirudinea

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Oligochaeta

few setae; head poorly developed earthworms

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Polychaeta

many setae; parapodia (paddle-like appendages) present head well developed

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Hirudinea

suckers present; no setae or parapodia

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clitellum

major role in reproductive process of earthworm, anterior end

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cuticle

protective body wall produced by underlying epidermis

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mantle

thin and fragile underlying tissue of mollusk shell

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Mollusca selected characteristics (4)

1. unsegmented, soft body 2. shell of one or two valves usually present, secreted by mantel 3. muscular foot used for locomotion 4. most equipped with radula

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classes of mollusca

Polyplacophora-chitons; 8 valves in thick mantle Gastropoda- single, coiled shell, radular Bivalvia-shell of 2 valves, gills, no rad Cephalopoda-shell reduced or absent, radula

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dorsal hinge ligaments

connect valves of clam

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mantle cavity

filled with gills in clam

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excurrent siphon

discharges water in squids

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image-forming eyes

unique feature of cephalopods

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Molting protosomes

nemotoda and arthropoda

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selected characteristics of nematoda

bilateral symmetry, cylindrical, unsegmented body, pseudocoelomate, complete digestive system, dioecious, body wall with longitudinal muscle

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Nemotada genus

ascaris

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cuticle

secreted by underlying epidermis, noncellular

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selected arthropoda characteristics

jointed appendages; chitinous exoskeleton; segmented body divided into body regions:head, thorax, abdomen; extreme cephalization; highly developed sense organs; specialized respitory structures

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ARTHROPODA SUBPHYLA

Cheliceriformes, Myriapoda, Crustacea, Hexapoda

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classes of cheliceriformes

merostomata and arachnida

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classes of Myriapoda

diplopoda and chilopoda

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