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

ne 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

anappendage on the 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

(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

s 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 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 of most fishes

Question 14

Cardiac Stomach-

Answer 14

connects the stomach to the duodenum. The pylorus is considered as having two parts, the pyloric antrum (opening to the body of the stomach) and the pyloric canal (opening to the duodenum).

Question 15

Ampullae-

Answer 15

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

Question 16

Gonads-

Answer 16

an organ that produces gametes; a testis or ovary.

Question 17

Central Disc-

Answer 17

Central region of sea stars & brittle stars from which rays or arms radiate; contains madreporite, mouth, & anus

Question 18

Tube Feet-

Answer 18

used for feeding, movement, and a little for respiration; located on ambulacral groove

Question 19

External Fertilization-

Answer 19

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. In contrast, internal fertilization takes place inside the female after insemination through copulation.

Question 20

Regeneration-

Answer 20

is the process of renewal, restoration, and growth that makes genomes, cells, organisms, and ecosystems resilient to natural fluctuations or events that cause disturbance or damage.

Question 21

Sea star-

Answer 21

a starfish

Question 22

Brittle star-

Answer 22

any echinoderm of the class Ophiuroidea, having the body composed of a central, rounded disk from which radiate long, slender, fragile arms.

Question 23

Sea urchin-

Answer 23

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 24

Sand dollar-

Answer 24

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

Question 25

Sea lilies-

Answer 25

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

Question 26

Feather stars-

Answer 26

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

Question 27

Sea daisies-

Answer 27

Sea daisies have been discovered in three localities, including deep-sea habitats

Question 28

Sea Cucumbers

Answer 28

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