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

Pedicellariae

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.

Question 7

Arm / Ray

Answer 7

A thing comparable to an arm in form or function, typically something that projects from a larger structure.

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

(in an echinoderm) 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

Extends from the mouth to the end of each ray or arm.

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

A ring of muscles, the pyloric sphincter, serves as a “gate,” closing the opening from the stomach to the intestine.

Question 15

Cardiac Stomach

Answer 15

The large anterior foregut, or cardiac stomach, occupies much of the posterior aspect of the head and the anterior thoracic body cavity.

Question 16

Ampullae

Answer 16

a cavity, or the dilated end of a duct, shaped like a Roman ampulla.

Question 17

Gonads

Answer 17

An organ that produces gametes; a testis or ovary.

Question 18

Central Disc

Answer 18

Any of various rounded and flattened animal anatomical structures.

Question 19

Tube Feet

Answer 19

(in an echinoderm) 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

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

Question 21

Regeneration

Answer 21

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

Question 22

Sea Star

Answer 22

5 Armed creature in the ocean.

Question 23

Brittle Star

Answer 23

Brittle stars or ophiuroids are echinoderms in the class Ophiuroidea closely related to starfish.

Question 24

Sea Urchin

Answer 24

Sea urchins or urchins are typically spiny, globular animals, echinoderms in the class Echinoidea.

Question 25

Sand Dollar

Answer 25

The term sand dollar refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida.

Question 26

Sea Lilies

Answer 26

Crinoids are marine animals that make up the class Crinoidea of the echinoderms.

Question 27

Feather Stars

Answer 27

They live in both shallow water and in depths as great as 9,000 meters.

Question 28

Sea Cucumbers

Answer 28

Sea cucumbers are echinoderms from the class Holothuroidea. They are marine animals with a leathery skin and an elongated body containing a single, branched gonad.

Question 29

Sea Daisies

Answer 29

Sea daisies make up an unusual group of deep-sea taxa belonging to the phylum Echinodermata, with three species described in the genus Xyloplax.