Echinoderm Flashcards
(29 cards)
Echinoderm
a marine invertebrate
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
RIng canal
he circular water tube that surrounds the esophagus of echinoderms.
Arm / Ray
outer limb of the echinoderm
Radial Symmetry
symmetry around a 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, the tube feet being operated by hydraulic pressure within the vessels.
Ambulacral Groove
anatomical parts in echinoderms
Ossicles
a small piece of calcified material forming part of the skeleton of an invertebrate animal such as an echinoderm.
Pyloric Caecum
one of the tubular pouches opening into the alimentary canal in the pyloric region
Pyloric Stomach
the distal aperture of the stomach, the opening
Cardiac Stomach
large anterior foregut
Ampulla
membranous bag shaped cavity
Gonads
sex organs, make sex cells
Central Disc
a circular structure either in plants or animals
Tube Feet
One of the numerous external, fluid-filled muscular tubes of echinoderms used for locomotion, respiration, and grasping food or prey.
External Fertilization
male organism’s sperm fertilizing a female organism’s egg outside of the female’s body
Regeneration
the process of renewal, restoration
Sea star
body is star-shaped and usually has five rays, though the number of rays varies
Brittle star
closely related to starfish, they crawl across the sea floor using their flexible arms for locomotion.
Sea urchin
enclosed in thin brittle globular tests covered with movable spines.
