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28 Cards in this Set
- Front
- Back
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Coelom
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fluid-filled body cavity.
lined by mesoderm lies between digestive tube & outer body wall |
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Tube w/in a tube
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The digestive tube is attatched to the body wall.
Mouth & anus |
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Advantages of having a coelom
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-hydrostatic skeleton
-provided a space where internal organs develop -protects organs by cushioning -fluid w/in coelom helps transport materials |
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Phylum: Platyhelminthes
"flatworms" |
acoelomate
bilateral symmetry triploblastic diffusion for respir. circ. Class: Turbelleria Trematoda Cestoda |
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Class Turbelleria
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"planarians"-freeliving flatowrms
Wastes are excreted by protonephredia |
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Protonephridia
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Blind tubules that end in flame bulbs. Collect cells equipped w/ cilia.
Cilia beating channels waste thru tubules & out of body thru pores. |
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Class Trematoda
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-"flukes"
-parasitic -attatch to host by hooks & suckers -responsible for schistosomiasis (liver & kidney deteriorate) |
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Class Cestoda
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-"tapeworms"
-parasitic |
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Phylum Nemertea
"ribbon worms" |
-proboscis: long, hollow, muscular tube that can be everted from the anterior end of the body. Wraps wround prey.
-no heart. blood is circulated by contractions of muscular bv and body movements -tube w/in a tube |
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Phylum Mollusca
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-soft body covered by a shell
-muscular foot -visceral mass: body organs -mantle: covers visceral mass. secretes a shell -radula: belt of teeth in mouth -metanephridia -hemocoel: space containing blood -open circulatory system |
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Open circulatory system
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-Hemolymph (blood) bathes tissues directly.
-Heart pumps blood into 1 vessel & flows in2large spaces called sinuses. -tissues bathed directly in sinuses -Blood goes into vessels where its led to gills for 02. Then it returns to heart. -Blood pressure low |
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Class Polyplacophora
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-"chitons"
-sluggish w/ flattened bodies -shell composed of 8 seperate dorsal plates |
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Class Gastropoda
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-"snails&slugs"
-Mantle fuctions as a lung -Torsion: twisting of visceral mass |
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Class Bivalvia
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"clams"
-2-part shell -suspension feeders: trap food particles in water -no radula |
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Class Cephalopoda
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-"octopus & squids"
-mouth surronded by tentacles or arms |
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Phylum Annelida
"segmented worms" |
-tubular body w/ segments (metameres)
-segments seperated by partitions called septa. -setae: provide traction -coelom -closed circ -metanephridia -ventral nerve cord |
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Class Polychaeta
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"marine worms"
-each body segment has a pair of parapodia (locomotion & gas exchange). |
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Class Oligochaeta
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"earthworms"
-setae & no parapodia |
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Hirudinea
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"leeches"
-no setae & parapodia |
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Phylum Nematoda
"roundworms" |
-fluid-filled pseudocoelom
-triploblsatic -organ system -lack circ structures |
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Phylum Arthropoda
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-exoskeleton made of chitin
- paired, jointed appendages -brain and ventral nerve cord -open circ -gills or trachea or book lungs |
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exoskeleton
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-coat of armor
-prevents loss of moisture -supports soft tissue -molting required |
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Subphylum Myriapoda
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-jawlike mandibles
-antennae -Class Chilopoda: centipedes -Class Diplopoda: millipedes |
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Subphylum Chelicerates
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-no antennae
-chelicerea-fanglike feeding appendages -Class Merostomes: horshoecrabs -Class Arachnids: spiders, scorpians, ticks. -trachea or book lungs |
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Subphylum Crustacea
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-lobsters, crabs, shrimp
-mandibles: jawlike structures for grinding food |
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Subphylum Hexapoda
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-articulated, tracheated hexapod
-head, thorax & abdomen -3 pairs of legs from thorax -spiracles: pores -malpighian tubules -metamorphosis |
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malpighian tubules
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receive metabolic wastes from the blood, concentrate wastes, discharge them into intestine, conserving water
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Metamorphosis
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egg, larva, pupa & adult
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