Echinoderm

Question 1

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

Answer 1

Echinoderm

Question 2

an internal skeleton

Answer 2

Endoskeleton

Question 3

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

Answer 3

Pedicellariae

Question 4

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

Answer 4

Madreporite-

Question 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

Answer 5

radial canal

Question 6

the circular water tube that surrounds the esophagus of echinoderms

Answer 6

ring canal

Question 7

literally an arm

Answer 7

Arm / Ray

Question 8

Circular symmetry

Answer 8

Radial Symmetry

Question 9

symmetry down center

Answer 9

bilateral symmetry

Question 10

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

Answer 10

water vascular system

Question 11

This ambulacral groove extends from the mouth to the end of each ray or arm

Answer 11

ambulacral groove

Question 12

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

Answer 12

Ossicles

Question 13

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

Answer 13

Pyloric Caecum

Question 14

connects the stomach to the duodenum

Answer 14

Pyloric Stomach

Question 15

The large anterior foregut

Answer 15

Cardiac Stomach

Question 16

a cavity, or the dilated end of a duct

Answer 16

Ampullae

Question 17

sexual reproduction organ

Answer 17

gonads

Question 18

having the body radially arranged, usually in the form of a star

Answer 18

Central Disc

Question 19

each of a large number of small, flexible, hollow appendages protruding through the ambulacra

Answer 19

Tube Feet

Question 20

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

Answer 20

external fertilization

Question 21

regrowth of limbs

Answer 21

regeneration

Question 22

starfish

Answer 22

sea star

Question 23

Ophiuroidea closely related to starfish. They crawl across the sea floor using their flexible arms for locomotion

Answer 23

Brittle star

Question 24

little “pricks”

Answer 24

Sea urchin

Question 25

sandy colored animal that is a circle with a star on it

Answer 25

Sand dollar

Question 26

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

Answer 26

Sea lilies

Question 27

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

Answer 27

feather stars

Question 28

an echinoderm that has a thick, wormlike body with tentacles around the mouth.

Answer 28

Sea cucumbers

Question 29

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

Answer 29

Sea daisies