Echinoderm Flashcards
a marine invertebrate of the phylum Echinodermata, such as a starfish, sea urchin, or sea cucumber
Echinoderm
internal framework of body of animal
Endoskeleton
claw-shaped structure
Pedicellariae
A perforated platelike structure in most echinoderms that forms the intake for their water-vascular systems
Madreporite
canals that form part of the water-vascular system
Radial canal
water tube that surrounds esophagus of echinoderms
Ring canal
arranged like points on a star
Arm / Ray
body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis
Radial Symmetry
body plan in which the left and right sides of the organism can be divided into approximate mirror images of each other along the midline
Bilateral Symmetry
helps with movement and oxygen exchange
Water Vascular System
radial areas in an echinoderm bearing the tube feet by which the creature moves
Ambulacral Groove
form part of endoskeleton
Ossicles
one of the paired tubes in each ray of a starfish
Pyloric Caecum
receive partially digested food
Pyloric Stomach
starfish can push this stomach outside the body to eat something
Cardiac Stomach
Squeeze To Controll Water Entering /Leaving Tube Feet
Ampullae
Makes Sprem or Eggs
Gonads
Central region of sea stars & brittle stars from which rays or arms radiate
Central Disc
used for feeding, movement, and a little for respiration
Tube Feet
process in which eggs are fertilized outside the female’s body
External Fertilization
restoration or new growth by an organism of organs, tissues, etc., that have been lost, removed, or injured
Regeneration
body radially arranged, usually in the form of a star, with five or more rays or arms radiating from a central disk
Sea star
body composed of a central, rounded disk from which radiate long, slender, fragile arms
Brittle star
shell composed of many calcareous plates covered with projecting spines
Sea urchin
various thin circular echinoderms of the coastal northern Atlantic and Pacific waters, having a covering of short movable spines
Sand dollar
various sessile echinoderms in which the body consists of a long stalk attached to a hard surface and bearing a central disc with delicate radiating arms
Sea lilies
body of a typical feather star is cup-shaped, their numerous feathery arms project from a central disc
Feather stars
any echinoderm of the class Holothuroidea, having a long, leathery body with tentacles around the anterior end
Sea cucumbers
soft-bodied, sluglike animals
without arms
Sea daisies
