Echinoderm Flashcards
echinoderm
a marine invertebrate
endoskeleton
an internal skeleton
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 from the paragastric cavity in some sponges and end just below the surface of the sponge
ring canal
the circular water tube that surrounds the esophagus of echinoderms
arm/ray
branches of a starfish
radial symmetry
symmetry around a central axis
bilateral symmetry
the property of being into symmetrical halves on either side of a unique plane
water vascular system
the network of water vessels in the body the tube feet being operated by hydraulic pressure within the vessels
ambulacral groove
extends the mouth to the end of each arm or ray
ossicles
a small piece of calcified material forming part of the skeleton of an invertebrate animal such as an echinoderm
pyloric caecum
runs along with the digestive system
pyloric stomach
digests foo from the cardiac stomach
cardiac stomach
the stomach that gets ejected
ampulla
a cavity or the dilated end of a duct shaped like a roman ampulla
gonads
reproductive parts
central disc
the center of a sea star and all the arms or rays come from it
tube feet
used for breathing and grasping food or prey
external fertilization
fertilization that takes place outside the body and in open water
regeneration
being able to regrow a body part or growing into two different creatures
sea star
a starfish
brittle star
a type of starfish with small arms with brittles on them
sea urchin
a small spiny marine animal
sand dollar
a round flat sea urchin
sea lilies
a sedentary marine echinoderm that has a small body on a long jointed stalk with featherlike arms to trap food
feather stars
an echinoderm with a small dislike body long feathery arms for feeding and movement and short appendages for grasping the surface
sea cucumbers
an echinoderm that has a thick wormlike body with tentacles around the mouth
sea daisies
a plant
