Echinoderm

Question 1

Echinoderm

Answer 1

a marine invertebrate of the phylum Echinodermata, such as a starfish, sea urchin, or sea cucumber.

Question 2

Endoskeleton

Answer 2

an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.

Question 3

Pedicellariea

Answer 3

a defensive organ like a minute pincer present in large numbers on an echinoderm.

Question 4

Madreporite

Answer 4

a perforated plate by which the entry of seawater into the vascular system of an echinoderm is controlled.

Question 5

Radial Canal

Answer 5

one of the numerous minute canals lined with choanocytes which radiate from the paragastric cavity in some sponges and end just below the surface of the sponge.

Question 6

Ring Canal

Answer 6

the circular water tube that surrounds the esophagus of echinoderms. 2 : the circular canal in the edge of the umbrella of a jellyfish that links the radial canals.

Question 7

Arm/ Ray

Answer 7

In some ophiuroids, one or several small, symmetrically arranged plates that are inserted between the dorsal arm plate and the lateral arm plate.

Question 8

Radial Symmetry

Answer 8

symmetry around a central axis, as in a starfish or a tulip flower.

Question 9

Bilateral Symmetry

Answer 9

the property of being divisible into symmetrical halves on either side of a unique plane.

Question 10

Water Vascular System

Answer 10

a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.

Question 11

Ambulacral Groove

Answer 11

typically used in the context of anatomical parts of the phylum Echinodermata or class Asteroidea and Edrioasteroidea.

Question 12

Ossicles

Answer 12

a very small bone, especially one of those in the middle ear.

Question 13

Pyloric Caecum

Answer 13

one of the tubular pouches opening into the alimentary canal in the pyloric region of most fishes.

Question 14

Pyloric Stomach

Answer 14

the distal aperture of the stomach, opening into the duodenum.

Question 15

Cardiac Stomach

Answer 15

.consists of a mouth; an esophagus; a two-chambered foregut; a midgut with outpocketings called digestive glands, or hepatopancreas; and a hindgut, or rectum.

Question 16

Ampullae

Answer 16

a roughly spherical flask with two handles, used in ancient Rome.

Question 17

Gonads

Answer 17

an organ that produces gametes; a testis or ovary.

Question 18

Central Disc

Answer 18

protrusion is a type of herniated or bulging disc that affects the spinal cord and could possibly result in nervous system disorders, such as radiating pain and muscle weakness as well as other symptoms stemming from nerve irritation.

Question 19

Tube Feet

Answer 19

each of a large number of small, flexible, hollow appendages protruding through the ambulacra, used either for locomotion or for collecting food and operated by hydraulic pressure within the water-vascular system.

Question 20

External Fertilization

Answer 20

a male organism’s sperm fertilizing a female organism’s egg outside of the female’s body.

Question 21

Regeneration

Answer 21

the action or process of regenerating or being regenerated, in particular the formation of new animal or plant tissue.

Question 22

Seastar

Answer 22

a starfish.

Question 23

Brittle Star

Answer 23

any of a class or subclass (Ophiuroidea) of echinoderms that have slender flexible arms distinct from the central disk.

Question 24

Sea Urchin

Answer 24

a marine echinoderm that has a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws. Many species are harvested for food.

Question 25

Sea Dollar

Answer 25

a flattened sea urchin that lives partly buried in sand, feeding on detritus.

Question 26

Sea Lillies

Answer 26

a sedentary marine echinoderm that has a small body on a long jointed stalk, with featherlike arms to trap food.

Question 27

Feather Star

Answer 27

an echinoderm with a small disklike body, long feathery arms for feeding and movement, and short appendages for grasping the surface.

Question 28

Sea Cucumber

Answer 28

an echinoderm that has a thick, wormlike body with tentacles around the mouth. They typically have rows of tube feet along the body and breathe by means of a respiratory tree.

Question 29

Sea Daisies

Answer 29

small, circular animals related to sea stars. There are only two species. Sea daisies have no arms, but the circle is rimmed with flat spines that look like daisy petals. The upper surface of the animal is delicately plated.