echinoderm Flashcards
a marine invertebrate
echinoderm
an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.
endoskeleton
a defensive organ like a minute pincer present in large numbers on an echinoderm.
Pedicellariae
an essential part of the circulation system in echinoderm
Madreporite
forming part of the water-vascular system, that extend from the stone canal
Radial canal
the circular water tube that surrounds the esophagus of echinoderms
Ring canal
allow them to move and guide themselves
Arm / Ray
symmetry around a central axis, as in a starfish or a tulip flower.
Radial Symmetry
the property of being divisible into symmetrical halves on either side of a unique plane.
Bilateral Symmetry
a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels
Water Vascular System
s a term typically used in the context of anatomical parts of the phylum Echinodermata or class Asteroidea and Edrioasteroidea
Ambulacral Groove
a very small bone, especially one of those in the middle ear.
Ossicles
a number of small outpocketings
Pyloric Caecum
sphincter, or valve, is a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the stomach to the duodenum
Pyloric Stomach-
occupies much of the posterior aspect of the head and the anterior thoracic body cavity.
Cardiac Stomach
the dialations of the semicircular canals of the ear
Ampullae
an organ that produces gametes; a testis or ovary
Gonads
having the body radially arranged, usually in the form of a star, with five or more rays or arms radiating from a central disk; asteroid
Central Disc
each of a large number of small, flexible, hollow appendages protruding through the ambulacra, used either for locomotion or for collecting food and operated by hydraulic pressure within the water-vascular system
Tube Feet
is a male organism’s sperm fertilizing a female organism’s egg outside of the female’s body
External Fertilization
the action or process of regenerating or being regenerated, in particular the formation of new animal or plant tissue.
Regeneration
are star-shaped echinoderms belonging to the class Asteroidea
Sea star
are echinoderms in the class Ophiuroidea closely related to starfish
Brittle star
archaically called sea hedgehogs, are small, spiny, globular animals
Sea urchin
extremely flattened, burrowing sea urchins
Sand dollar-
marine animals that make up the class Crinoidea
Sea lilies
n echinoderm with a small disklike body, long feathery arms for feeding and movement, and short appendages for grasping the surface
Feather stars
an echinoderm that has a thick, wormlike body with tentacles around the mouth
Sea cucumbers
are small, circular animals related to sea stars. … Sea daisies have no arms, but the circle is rimmed with flat spines that look like daisy petals
Sea daisies
