ECHINODERMVOCAB ONLY

A radially symmetrical marine invertebrate with an endoskeleton, water-vascular system,

and tube feet such as a sea star, sea urchin or sea cucumber _________________________

Special type of radial symmetry in which body parts extend outward along 5 spokes _______________

One of the small calcium carbonate plates that forms the endoskeleton of echinoderms ________________

echinoderm

pentaradial

ossicle

Surface of a starfish on which the mouth is located______________

One of the many small, flexible, fluid filled tubes that project from the body of an echinoderm and are used in locomotion, feeding, gas exchange, and nitrogen excretion _________________

Small pincher-like structure on the surface of certain echinoderms that keep the surface clean ________________

Oral surface (ventral)

Tube feet

pedicellaria

Surface opposite the mouth and a starfish_______________

Sieve-like opening on the aboral surface of a starfish through which water enters the water vascular system _________________

A mass of nerve cells ________________

Aboral surface (dorsal)

madreporite

ganglion

A network of water-filled canals in an echinoderm _____________

Part of the water vascular system that connects the madreporite and ring canal _____________

Bulb-like sac at the top of the tube foot which controls water entering and leaving the foot ________________

Water vascular system

Stone canal

ampulla

Portion of an echinoderm’s stomach that is extruded through the mouth during feeding __________________

The fluid that is circulated through the body of an animal with an open circulatory system _________________

Winged larva seen in echinoderms ________________

Cardiac stomach

hemolymph

bipinnaria

Special type of symmetry seen in starfish with 5 arms _____________

Development in which the offspring start as small versions of adults

Type of circulatory system in which blood is contained in vessels ___________________

Pentaradial symmetry

Direct development

closed

In a sea star the stomach that is connected to the digestive glands__________________

The hemolymph-filled space or body cavity of some invertebrates _________________

One of the many hollow tubes that project from the surface of a sea star through which gas exchange and nitrogen excretion takes place ________________

Pyloric stomach

hemocoel

Skin gills

Nerve that encircles the mouth in a sea star __________________

Organism whose embryonic blastopore becomes the anus _______________

Organism without a backbone ________________

Nerve ring

deuterostome

invertebrate

Type of development in which offspring hatch as an immature larva and must change into their adult form _____________

Joining of an egg and sperm outside the female’s body _________________

Organism that lives in the ocean (salt water) ________________

indirect

external fertilization

marine

Nerve that runs along inside the ambulacral ridge in each arm of a starfish _____________

Portion of the sea star’s water vascular system that runs along inside the ambulacral ridge in each arm _________________

Groove on the oral surface of a sea star that holds the tube feet ________________

Radial nerve

Radial canal

Ambulacral groove

Greenish digestive enzyme that breaks down fat _____________

Space that surrounds the internal organs _________________

Type of skeleton found inside the body ________________

bile

coelom

endoskeleton

Type of symmetry seen in echinoderms in which body parts are arranged around a central axis _____________

Development in which the offspring start as an immature larva and undergo metamorphosis to become adults_________________

Type of circulatory system in which blood is NOT contained in vessels and flows loose inside the body cavity and tissue spaces ___________________

Radial symmetry

Indirect development

open