echinodermota
water vascular system
a hydraulic system used by echinoderms
dermal endoskeleton
An internal supporting skeleton, derived from the mesoderm, that is characteristic of vertebrates and certain invertebrates.
ambulacra
an elongated area of the shell of an echinoderm in which a row of tube feet are arranged.
ossicles
the three smallest bones in the human body, the malleus, the incus and the stapes.
pedicellariae
a small wrench- or claw-shaped structure commonly found on Echinoderms
podia
Tube feet (podia) are supported by a hydraulic and connective-tissue skeleton
madreporite
a lightcolored calcerous opening used to filter water into the water vascular system of echinoderms
dermal branchiae/ papulae
skin gills, are projections of the coelom of Asteroidea that serve in respiration and waste removal.
canals
carry water to the ampulla (reservoir) portion of tube feet.
Tiedemann’s bodies
pouches on the ring canal whose function may be osmoregulation or hydraulic regulation within the water vascular
ampulla
a dilated portion of a canal or duct, especially of the semicircular canals of the ear
ceca
is used to maintain food stationary for consumption
Aristotle’s lantern
The entire chewing organ
cloaca
The common cavity into which the intestinal, genital, and urinary tracts open in vertebrates such as fish, reptiles, birds, and some primitive mammals.
echinodermata
radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers.
crinoidea
A large class of Echinodermata, including numerous extinct families and genera, but comparatively few living ones.
asteroidea
radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers.
echinoidea
class that includes sea urchins
holothuroidea
class of echinoderms including the sea cucumbers
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