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

term that is used to describe a panoply of tiny claw, clamp, wrench or beak shaped structures that are present on the external surface of starfish and sea urchins.

Question 4

Madreporite

Answer 4

light colored calcerous opening used to filter water into the water vascular system of echinoderms.

Question 5

Radial canal

Answer 5

canals forming part of the water-vascular system, that extend from the stone canal into each arm, passing along the oral side of the ambulacral groove and ending in a small, external tentacle.

Question 6

Ring canal

Answer 6

Water comes into the system via the madreporite. It is then circulated from the stone canal to the ring canal and into the radial canals. The radial canals carry water to the ampullae and provide suction to the tube feet.

Question 7

Arm / Ray

Answer 7

body radially arranged, usually in the form of a star, with five or more rays or arms radiating from a central disk

Question 8

Radial Symmetry

Answer 8

Baby sea stars have this type of symmetry.

Question 9

Bilateral Symmetry

Answer 9

Adult sea stars have this type of symmetry.

Question 10

Water Vascular System

Answer 10

disc that periodically takes in water to replenish this

Question 11

Ambulacral Groove

Answer 11

ridge on the aboral side of each ray, known as what

Question 12

Ossicles

Answer 12

honeycombed plates form the dermal region with an overlying epidermis. Their function is to protect the underlying tissue and to give strength and structure to the star fish.

Question 13

Pyloric Caecum

Answer 13

part of the starfish’s digestive system, which also includes the pyloric ducts, pyloric stomach and cardiac stomach.

Question 14

Pyloric Stomach

Answer 14

is considered as having two parts, the pyloric antrum and the pyloric canal

Question 15

Cardiac Stomach

Answer 15

consists of a mouth; an esophagus; a two-chambered foregut it occupies much of the posterior aspect of the head and the anterior thoracic body cavity.

Question 16

Ampullae

Answer 16

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

Question 17

Gonads

Answer 17

an organ that produces gametes; a testis or ovary.

Question 18

Central Disc

Answer 18

a part in the water vascular system.

Question 19

Tube Feet

Answer 19

many small tubular projections found on the oral face of a sea star’s arms

Question 20

External Fertilization

Answer 20

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

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 22

Sea star

Answer 22

star-shaped echinoderms belonging to the class Asteroidea

Question 23

Brittle star

Answer 23

just like a sea star but has smaller legs, and has no tube feet.

Question 24

Sea urchin

Answer 24

small, spiny, globular animals. in the class Echinoidea of the echinoderm phylum.

Question 25

Sand dollar

Answer 25

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

Question 26

Sea lilies

Answer 26

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

Question 27

Feather stars

Answer 27

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

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

Question 29

Sea daisies

Answer 29

the organism is small and, very hard to see