echinoderm

Question 1

Echinoderm

Answer 1

Echinoderm is the common name given to any member of the Phylum Echinodermata of marine animals. The adults are recognizable by their radial symmetry, and include such well-known animals as starfish

Question 2

Endoskeleton

Answer 2

an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.

Question 3

Pedicellariae

Answer 3

is a 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

is 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

canals extending through the substance of the umbrella from the gastric cavity to the marginal circular canal in jellyfish

Question 6

Ring canal

Answer 6

the circular water tube that surrounds the esophagus of echinoderms.

Question 7

Arm / Ray

Answer 7

there arms

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.

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.

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.

Question 11

Ambulacral Groove

Answer 11

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

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. The large anterior foregut, or cardiac stomach, occupies much of the posterior aspect of the head and the anterior thoracic body cavity.

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

protrusion is a type of spinal disc disorder that can result in neck or back pain, as well as other symptoms due to nerve irritation.

Question 19

Tube Feet

Answer 19

are 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

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

Question 23

Sea urchin

Answer 23

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 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

are crinoids with a calyx and five pairs of feather-like arms standing on a long stalk which is retained throughout the animal’s life

Question 26

Feather stars

Answer 26

Crinoids are marine animals that make up the class Crinoidea of the echinoderms.

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.

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.

Question 29

Brittle star

Answer 29

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.