Echinoderms

Question 1

Echinoderm

Answer 1

a marine invertebrate

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

Question 6

Ring canal

Answer 6

the circular water tube that surrounds the esophagus of echinoderms

Question 7

Arm / Ray

Answer 7

Arm of a starfish

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

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

Question 12

Ossicles

Answer 12

a small piece of calcified material forming part of the skeleton of an invertebrate animal such as an echinoderm.

Question 13

Pyloric Caecum

Answer 13

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

Question 14

Pyloric Stomach

Answer 14

connects the stomach to 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. The large anterior foregut, or cardiac stomach,

Question 16

Ampullae

Answer 16

Any membranous bag shaped like a leathern bottle, as the dilated end of a vessel or duct

Question 17

Gonads

Answer 17

reproductive gland is a mixed gland that produces the gametes

Question 18

Central Disc

Answer 18

Origin of starfish.

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

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

Sea star

Answer 22

a starfish.

Question 23

Brittle star

Answer 23

ophiuroids are echinoderms in the class Ophiuroidea closely related to starfish

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.

Question 25

Sand dollar

Answer 25

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

Question 26

Sea lilies

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 stars

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 cucumbers

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

are small, circular animals related to sea stars. … Sea daisies have no arms