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APSM Biology 5.4
APSM CA Biology 5.4 Invertebrates
| Term | Definition |
|---|---|
| abdomen | rearmost portion of an insect’s body |
| acoelomate | insect with no body cavity |
| ametabolous | insect that doesn’t undergo metamorphosis |
| annelid | segmented worms |
| arachnids | arthropod with two main body regions & eight legs |
| arthropods | invertebrates with jointed appendages |
| ascaris | parasitic roundworm that lives in the host’s intestine |
| caterpillar | larval stage of butterflies & moths |
| centipedes | caterpillar-like arthropod with long flattened body; long, jointed antennae; poison claws; and a single pair of legs on each body segment |
| chitin | cellulose like substance that makes up an arthropod’s exoskeleton |
| cnidarian | includes jellyfish, hydra, sea anemone |
| cnidocytes | stinging cells of coelenterates |
| coelom | body cavity of insects |
| coelomate | insect with body cavity lined by mesoderm on all sides |
| collar cell | any of the cells that line a sponge’s body cavity |
| crustaceans | aquatic arthropods with two pairs of antennae, two or more pairs of appendages, and a hard exoskeleton |
| echinoderms | spiny-skinned invertebrate with a water-vascular system |
| fluke | parasitic flatworm that spends part of its life as a parasite in a snail |
| foot | muscular organ used by mollusk for locomotion |
| ganglia | mass of neuron cells |
| head | front portion of an insect’s body |
| hemimetabolous | partial metamorphosis in an insect (no pupa) |
| hemocoel | open cavity of an arthropod where the blood is pumped into |
| holometabolous | complete metamorphosis in an insect |
| insects | arthropod with three distinct body regions, simple & compound eye, trachea, and three pairs of legs |
| larva | immature wormlike eating and growing stage of an insect |
| maggot | larval stage of some insects (like flies) |
| Malpighian tubules | excretion organs in insects |
| Mantle | skin-like organ that covers a mollusk’s visceral hump |
| Metamorphosis | transformation of an immature for such as nymph or larva into an adult |
| Metanephridia | excretion organs of annelids |
| Millipedes | caterpillar-like arthropod with long rounded body; short antennae; and two pairs of legs on each body segment |
| Mollusk | soft-bodied invertebrates with a muscular foot, visceral hump, and mantle |
| Nematocysts | specialized cell in cnidarians that can be projected for self-defense or prey capture |
| Nematodes | roundworms; non-segmented invertebrate with long, slender body covered by a thin cuticle |
| Pharynx | throat |
| pseudocoelomate | insect with body cavity lined by mesoderm & endoderm |
| pupa | form of an insect in which it stops feeding and rests while its body transforms from a larva into an adult |
| radula | rough, file-like gastropod organ that scrapes food and carries it into the digestive tract |
| septa | membranes that separate the segments of annelids |
| setae | bristles on a body segment of an earthworm |
| thorax | middle portion of insect’s body |
| water vascular system | hydraulic like system extending through the body of echinoderms that is used for movement |
Created by:
samundoacademy
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