echinoderms Flashcards
Echinoderm
marine animals
Endoskeleton
internal skeleton
Pedicellariae
defensive organ like a minute pincer present in large numbers on an echinoderm
Madreporite
perforated plate by which the entry of seawater into the vascular system of an echinoderm is controlled
Radial canal
allow movement of tentacles
Ring canal
canal ring is the name given to a series of canals that make a complete loop
Arm / Ray
allow movement and ability to guide themselves
Radial Symmetry
symmetry around a central axis
Bilateral Symmetry
divisible into symmetrical halves on either side
Water Vascular System
for locomotion, food and waste transportation, and respiration
Ambulacral Groove
parts that include ossicles, plates, spines, and suckers that go from the mouth to the end of the ray
Ossicles
They form part of the endoskeleton and provide rigidity and protection
Pyloric stomach
pyloric stomach has two extensions into each arm
Pyloric caeca
These are elongated, branched hollow tubes that are lined by a series of glands, which secrete digestive enzymes and absorb nutrients from the food.
Cardiac Stomach
consists of a mouth; an esophagus; a two-chambered foregut; a midgut with outpocketings, hepatopancreas; and a hindgut
Ampullae
bulb-shaped structures located above the tube feet
Gonads
reproductive gland that produces reproductive cells
Central Disc
Starfish have a central disk that is not marked off from the unbranched arms
Tube Feet
function in locomotion, feeding, and respiration
External Fertilization
fertilizing an egg outside the females body
Regeneration
ability to regrow parts of the body previously lost
Sea star
tis a starfish
Brittle star
like a starfish but are transparent
Sea urchin
spiky sea ball
Sand dollar
flattened, burrowing sea urchins
Sea lilies
cronoid
Feather stars
cronoid
Sea cucumbers
hey are marine animals with a leathery skin and an elongated body containing a single, branched gonad
Sea daisies
Sea daisies make up an unusual group of deep-sea taxa
