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28 Cards in this Set
- Front
- Back
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mollusk characteristics
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usually 1 or 2 shelled for protection
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mantle
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thin membrane covering the body organs, secretes the shell
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gills
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organs in which carbon dioxide is exchanged for oxygen in water
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open circulatory system
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the heart moves the blood that contains nutrients and oxygen through vessels and out into open spaces around the body organs
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TYPES OF MOLLUSKS
1. gastropods |
largest group of mollusks
1 shell (exception- slugs) |
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TYPES OF MOLLUSKS
2. bivalves |
hinged, 2 part shell
ex. clams, oysters, and scallops |
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TYPES OF MOLLUSKS
3. cephalopods |
large, well-developed head
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segmented worm (annelids)
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setae- bristlelike structurs that help the earthworms move through soil
have body cavity that holds organs |
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TYPES OF WORMS
1. earthworm digestion and excretion |
CROP for storage, GIZZARD for grinding
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TYPES OF WORMS
1. earthworms circulation |
"closed circulatory system"
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TYPES OF WORMS
2. marine worms (polychaetes) |
some sessile
some build tubes |
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TYPES OF WORMS
3. leeches |
chemicals in saliva prevent blood from clotting
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Characteristics of Arthropods
body structures |
APPENDAGES include legs, antennae, claws, and pincers
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Characteristics of Arthropods
exoskeleton |
hard outer covering
molting: shedding of exoskeleton |
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TYPES OF ARTHROPODS
1. insects |
most common
3 distinct body sections- head, thorax, and abdomen |
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insect abdomen
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has spiracles- tiny openings in exoskeleton where air enters and leaves the body
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insect
metamorphosis |
change in form through which many insects pass when they become adults
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insects
incomplete metamorphosis |
3 stages (egg, nymph, and adult)
nymph- tiny adult |
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insects
complete metamorphosis |
4 stages (egg, larva, pupa, and adult)
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2. arachnids
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4 pairs of walking legs (8 legs)
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TYPES OF ARACHNIDS
1. scorpions |
sharp, poison-filled stinger at end of abdomen
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TYPES OF ARACHNIDS
2. spiders |
can't chew; release enzymes into prey to help digest; then suck predigested liquid into mouth
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TYPES OF ARTHROPODS
1. centipede |
1 pair of legs per segment
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TYPES OF ARTHROPODS
2. millipede |
2 pair of legs per segment
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echinoderm characteristic
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ENDOSKELETON
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ECHINODERM
water-vascular system |
a network of water-filled canals with thousands of tube feet
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TYPES OF ECHINODERMS
1. sea stars METHOD OF EATING |
1. pushes stomach through its mouth and into prey
2. stomach surrounds body of prey 3. secrets enzymes for digestion 4. pulls stomach back into body when finished |
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5 other types of echinoderms
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brittle star
sand dollar sea biscuit sea urchin sea cucumber |
