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LS AD Chapter 2
Invertebrates 2
| Term | Definition |
|---|---|
| Mantle | Tissue that covers the internal organs of mollusks. It produces shell. |
| Gill | Organ for exchanging gases with the environment under water. |
| Open Circulatory System | Blood is not always contained in a vessel. Open spaces surround internal organs, which get "bathed" in blood. |
| Radula | Teeth-like structures of snails. |
| Gastropoda | Translated as "stomach-footed". The class of Mollusks which includes the snails |
| Cephalo | Means "head" |
| Cephalopoda | Translated as "head-footed". The class of Mollusks which includes a nautilus. |
| Bivalvia | Translated "two doors". The class of Mollusks which includes clams. |
| Annelida | Translated as "little rings". Also known as segmented worms. |
| Molluska | Translated as "soft-bodied". Includes shelled creatures of the sea and land snails. |
| Setae | Bristle-like structures on earthworms used for grasping the walls of their burrow. |
| Crop | Organ for holding food from the mouth. |
| Gizzard | Organ for holding food from the crop. Acts like a stomach to grind food mechanically and chemically. |
| Oligochaeta | Translated "few bristles". The class of Annelids that includes earthworms. |
| Polychaeta | Translated "many bristles". The class of Annelids that includes marine worms. |
| Hirudinea | The class of Annelids that includes leaches. |
| Arthropoda | Translated "jointed legs". The phylum of creatures that includes insects, crustaceans, arachnids, and centipedes/millipedes. |
| Thorax | The part of an insect body to which the legs are attached. |
| Exoskeleton | Hard outer covering used for protection and provides camouflage. |
| Spiracles | Holes found in the exoskeleton of insects through which gases are exchanged. |
| Metamorphosis | The transformational change of insects from eggs to adults. |
| Echinodermata | Translated "spiny-skinned". Phylum of creatures that includes seas stars, brittle stars, sand dollars, and sea urchins. |
| Tube Feet | Used by echinoderms to move about. |
| Water-Vascular system | A system for the exchange of gases and metabolic wastes through exposure to water. |