Echinoderms Flashcards
marine invertebrates with radial symmetry and a water vascular system; name means “spiny skin”
echinoderms
made up of calcium carbonate plates and spines; enclosed by epidermis
endoskeleton
claw-shaped appendages with movable jaws; remove unwanted particles from the body
pedicellariae
filters water into the vascular system
madreporite
circular canal that carries water in the water vascular system
radial canal
circular canal near the mouth
ring canal
appendages on an echinoderm
rays
symmetry around a center
radial symmetry
property of being divisible into equal halves
bilateral symmetry
system of water-filled canals that help echinoderms extend-retract limbs
water vascular system
contains parts like ossicles, plates, spines, and suckers
ambulacral groove
one of the calcium carbonate plates that makes up the endoskeleton of an echinoderm
ossicle
digestive glands connecting to the pyloric stomach
pyloric caecum
secondary stomach that receives and digests food from the primary stomach
pyloric stomach
stomach that can be pushed out of the body to catch prey
cardiac stomach
muscular sack that pushes water to move tube feet
ampulla
reproductive organs
gonads
central region of sea stars from which rays radiate; contains mouth, madreporite, and anus
central disc
part of the water vascular system that is a hollow tube with suction cups to help echinoderms cling to rocks
tube feet
asexual reproduction
external fertilization
growing back limbs
regeneration
star-shaped echinoderms
sea stars
close relatives of starfish that crawl around the ocean floor with their arms
brittle stars
round, spiny echinoderms
sea urchins
flattened, burrowing sea urchins
sand dollars
echinoderms that are attached to the sea bottom by a stalk
sea lilies
relatives of sea lilies
feather stars
echinoderms with a long, leathery body and one single branched gonad; found on the ocean floor
sea cucumbers
small, circular echinoderms related to sea stars; have no arms but spines
sea daisies
