14 Phylum Echinodermata Flashcards
Named so due to the presence of external spine or protuberances that gives them a prickly and rough
texture.
* Exclusively marine habitat; occur in all oceans at all depths; all bottom dwellers with a few pelagic
* Free-living; No parasitic forms; a few are commensals.
* Body is rounded, cylindrical, or star-shaped;
* Unsegmented, with pentaradial symmetry (only in adult form)
* Triploblastic, eucoelomate
phylum echinodermata
(echinatus = “_______” + derma = “______”)
prickly, skin
the side with the mouth
Oral Side/Surface
grooves bordered by spines that extends from the mouth and through each arm; may be open or closed, depending on the class
Ambulacral grooves
small tubes that expel small amounts of water to help the body crawl
through sea floor.
Tube feet/Podia
the opposite side; usually facing up (“dorsal” side)
Aboral Side/Surface
red/orange plate that filters water inward
Madreporite
projections in the body cavity that serves for respiration and waste removal
Papulae (skin gills)
– small claw-shaped appendages with movable “jaws” that functions for defense, protect body surface from debris, and sometimes aid in food capture
Pedicellaria
“Endo-” =
inside
connective tissues that hold the calcareous plates together
Catch Collagen
covered by a thin layer of tissue
dermal calcareous ossicles/plates with spines or spicules
Stomach has an upper part
(pyloric)
lower part
cardiac
an essential part of the system; a button-like plate on the aboral surface that filters
water into the water-vascular system and acts like a pressure-equalizing valve
Madreporite
