Echinoderms Flashcards
Echinoderm
A marine invertebrate
Endoskeleton
An Internal Skeleton
Pedicellariae
A defensive organ
Madreporite
A perforated plate by which the entry of seawater into the vascular system of an echinoderm is controlled
Ring Canal
Circular water tube that surrounds the esophagus
Arm/Ray
Appendage
Radial Symmetry
Symmetry around the central axis
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
Ambulacral Groove
parts that include the ossicles, plates, spines, and suckers
Ossicles
A small piece of calcified material forming a part of the skeleton of an invertebrate animal
Plyoric Caecum
Tubular pouch opening into the alimentary canal in the pyloric region of most fishes
Pyloric stomach
Connects the stomach to the duodenum
Cardiac stomach
A two chambered fore gut, a midgut with outpocketings called digestive glands or hepatopancreas and a hindgut and a rectum
Ampullae
A cavity or the dilated end of a duct, shaped like a roman ampullae
Gonads
an organ that produces gametes
Central Disc
Where the arms radiate from
Tube Feet
Large number of small felxible hollow appendages protruding through the ambulacral used either for locomotion or collecting food
External Fertilization
Sperm unites with an egg in the open
Regeneration
the action or process of formation of a new limb
Sea Star
A marine echinoderm with five or more radiating arms
Brittle Star
An Echinoderm that is related to the starfish with long thin flexible arms
Sea Urchin
Spherical or flattened shell covered with spines
Sand Dollar
A flattened sea urchin that lives partly buried in the sand feeding on detritus
