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

five arms extending from a central disk. brittle star, brittle-star, serpent star. an animal resembling a starfish with fragile whiplike arms radiating from a small central disc.

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

sea stars or “star fish” have an ambulacral groove on their oral side (underside). This ambulacral groove extends from the mouth to the end of each ray or arm.

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 caeca

Answer 13

These are elongated, branched hollow tubes that are lined by a series of glands, which secrete digestive enzymes and absorb nutrients from the food

Question 14

Pyloric Stomach-

Answer 14

considered as having two parts, the pyloric antrum (opening to the body of the stomach) and the pyloric canal (opening to the duodenum). The pyloric canal ends as the pyloric orifice, which marks the junction between the stomach and the duodenum.

Question 15

Cardiac Stomach-

Answer 15

occupies much of the posterior aspect of the head and the anterior thoracic body cavity

Question 16

Ampullae-

Answer 16

are bulb-shaped structures located above the tube feet of starfish and other echinoderms

Question 17

Gonads

Answer 17

Gonad, in zoology, primary reproductive gland that produces reproductive cells

Question 18

Central Disc-

Answer 18

is the activity centre of the starfish and also contains the mouth of the 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

releasing their gametes into the water where they hopefully are fertilized by gametes from the opposite sex.

Question 21

Regeneration-

Answer 21

regenerate lost arms and can regrow an entire new limb given time.

Question 22

Sea star-

Answer 22

star-shaped echinoderms belonging to the class Asteroidea.

Question 23

Brittle star-

Answer 23

ophiuroids are echinoderms in the class Ophiuroidea closely related to starfish. They crawl across the sea floor using their flexible arms for locomotion. The ophiuroids generally have five long, slender, whip-like arms which may reach up to 60 cm in length on the largest specimens

Question 24

Sea urchin

Answer 24

typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres

Question 25

Sand Dollar

Answer 25

species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida.

Question 26

Sea lilies-

Answer 26

marine animals that make up the class Crinoidea of the echinoderms. They live in both shallow water and in depths as great as 9,000 meters

Question 27

Feather stars-

Answer 27

marine animals that make up the class Crinoidea of the echinoderms. They live in both shallow water and in depths as great as 9,000 meters

Question 28

Sea cucumbers-

Answer 28

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 Daises

Answer 29

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