| A | B |
|---|
| Echinodermata | the phylum that includes starfish, brittle stars, sea urchins, and other spiny-skinned animals |
| exoskeleton | Most echinoderms have some form of hard, calcium outer covering called an ___. |
| spiny skin | The name"echinoderm" comes from two Greek words meaning ____ ____. |
| sea star | a more correct name for a starfish |
| ray | correct name for the arm of a starfish |
| regeneration | asexual means of reproduction which echinoderms easily accomplish (cut up pieces can each regrow into a new animal) |
| sexual | type of reproduction in echinoderms which requires the union of an egg and a sperm cell from two different parent animals |
| stomach | major digestive organ in a starfish; it can turn itself inside-out! |
| anus | opening for wastes at the end of a starfish's digestive track |
| mouth | opening of a starfish's digestive track that leads into the stomach |
| clams & oysters | favorite food of starfish |
| water vascular system | starfish organ system that enables it to open a living clam or oyster; it is composed of tubes, canals, and tube feet |
| tube feet | starfish have hundreds of these tiny, water-filled, tubular structures used for locomotion and opening the shells of prey |
| radial canal | tube feet of a starfish are all connected to this water-filled structure |
| ring canal | all radial canals in a starfish's water vascular system are connected to this central water-filled structure |
| sieve plate | the only opening to a starfish's water vascular system where water can be pushed out or drawn in |
| eyespot | sensory organ that is on the tip of each ray of a starfish |
| digestive track | starfish organ system that includes a mouth, a stomach, and an anus |
| nervous system | starfish organ system that allows it to sense touch and other stimuli |
| locomotion (movement) | a starfish's tube feet are used for two purposes: for opening the shells of prey and for ____. |
| sea cucumber | echinoderm with dark, leathery skin and no bony exoskeleton, which throws up some of its internal organs to satisfy predators and later regenerates them; resembles a large pickle |
| sea urchin | echinoderm that is dome-shaped with many long spines covering its surface; sometimes called the "porcupine of the sea" |
| brittle star | echinoderm that has five or more very thin, serpent-like rays |
| sand dollar | echinoderm that is circular and usually fairly flat and covered with very short, fur-like spines |
