Echinoderms Flashcards
Echinoderm
largest phylum that has no freshwater or terrestrial (land-based) representatives.
Endoskeleton
an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.
Pedicellariae
a defensive organ like a minute pincer present in large numbers on an echinoderm.
Madreporite
a perforated plate by which the entry of seawater into the vascular system of an echinoderm is controlled.
Radial canal
one of the numerous minute canals lined with choanocytes which radiate from the paragastric cavity in some sponges
Ring canal
the circular water tube that surrounds the esophagus of echinoderms
Radial Symmetry
symmetry around a central axis, as in a starfish or a tulip flower.
Bilateral Symmetry
the property of being divisible into symmetrical halves on either side of a unique plane.
Water Vascular System
a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.
Ambulacral Groove
parts that include ossicles, plates, spines, and suckers.
Ossicles
a very small bone, especially one of those in the middle ear.
Pyloric Caecum
This organ with fingerlike projections is located near the junction of the stomach and the intestines.
Pyloric Stomach
The pylorus is considered as having two parts
Cardiac Stomach
The cardiac stomach is the narrow region surrounding the opening of the esophagus that contains cardiac glands in the mucosa.
Ampullae
a roughly spherical flask with two handles, used in ancient Rome.
Gonads
an organ that produces gametes; a testis or ovary.
Central Disc
he jelly-like inner substance can be squeezed, or pushed out to the side, or back. And touch or put pressure on one of the spinal nerves.
Tube Feet
each of a large number of small, flexible, hollow appendages protruding through the ambulacra, used either for locomotion or for collecting food
External Fertilization
External fertilization is a male organism’s sperm fertilizing a female organism’s egg outside of the female’s body
Regeneration
the action or process of regenerating or being regenerated, in particular the formation of new animal or plant tissue.
Sea star
Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea.
Brittle star
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.
Sea urchin
Sea urchins or urchins are typically spiny, globular animals, echinoderms in the class Echinoidea.
Sand dollar
The term sand dollar refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida.
