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

blanket 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

s a lightcolored calcerous opening used to filter water into the water vascular system of echinoderms. It acts like a pressure-equalizing valve.

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. 2 : the circular canal in the edge of the umbrella of a jellyfish that links the radial canals.

Question 7

Arm / Ray-

Answer 7

limbs

Question 8

Radial symmetry

Answer 8

arrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves by any plane that contains the main axis. The body plans of echinoderms, ctenophores, cnidarians, and many sponges and sea anemones show radial symmetry

Question 9

Bilateral Symmetry-

Answer 9

arrangement of an organism or part of an organism along a central axis, so that the organism or part can be divided into two equal halves. Bilateral symmetry is a characteristic of animals that are capable of moving freely through their environments. Compare radial symmetry.

Question 10

Water Vascular System-

Answer 10

is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. The system is composed of canals connecting numerous tube feet.

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

are three bones in either middle ear that are among the smallest bones in the human body. They serve to transmit sounds from the air to the fluid-filled labyrinth

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

or pyloric part, connects the stomach to the duodenum. The pylorus is considered as having two parts, the pyloric antrum

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

a roughly spherical flask with two handles, used in ancient Rome.

Question 17

Gonads-

Answer 17

an organ that produces gametes; a testis or ovary.

Question 18

Central Disc-

Answer 18

type of spinal disc disorder that can result in neck or back pain, as well as other symptoms due to nerve irritation. The exact origin and severity of a disc protrusion dictates the extent of an individual’s pain or discomfort caused by the problematic disc.

Question 19

Tube Feet-

Answer 19

the many small tubular projections found on the oral face of a sea star’s arms; they are characteristic of the water vascular system of the echinoderm phylum, which also includes sea urchins, sand dollars and sea cucumbers and many other sea creatures.

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

Question 21

Regeneration-

Answer 21

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 22

Sea star

Answer 22

Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea. Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or “basket stars”.

Question 23

Brittle star-

Answer 23

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 24

Sand dollar-

Answer 24

The term sand dollar are species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits.

Question 25

Sea lilies-

Answer 25

any crinoid marine invertebrate animal (class Crinoidea, phylum Echinodermata) in which the adult is fixed to the sea bottom by a stalk.

Question 26

Feather stars-

Answer 26

are marine animals that make up the class Crinoidea of the echinoderms. Crinoidea comes from the Greek word krinon, “a lily”, and eidos, “form”. They live both in shallow water and in depths as great as 6,000 metres

Question 27

Sea cucumbers-

Answer 27

Sea cucumbers are 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.

Question 28

Sea daisies-

Answer 28

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