enhinoderm

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

any echinoderm of the class Asteroidea, having the body radially arranged, usually in the form of a star, with five or more rays or arms radiating from a central disk; asteroid.

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

Opposite the ambulacral groove is an ambulacral ridge on the aboral side of each ray, known as an ambulacrum. These have interambulacra between them.

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

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.

Question 16

Ampullae-

Answer 16

special sensing organs called electroreceptors, forming a network of jelly-filled pores.

Question 17

Gonads-

Answer 17

an organ that produces gametes; a testis or ovary.

Question 18

Central Disc-

Answer 18

any echinoderm of the class Asteroidea, having the body radially arranged, usually in the form of a star, with five or more rays or arms radiating from a central disk; asteroid.

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

is a strategy of fertilization in which a sperm cell unites with an egg cell in the open, rather than inside specialized organs within the bodies of the parents.

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

Brittle stars or ophiuroids are echinoderms in the class Ophiuroidea closely related to starfish. They crawl across the sea floor using their flexible arms for locomotion.

Question 24

Sea urchin-

Answer 24

Sea urchins or urchins, archaically called sea hedgehogs, are small, spiny, globular animals that, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum.

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

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