Animalia
-Subkingdom Parazoa: Sponges
-Subkingdom Eumetazoa:
--Radiata:Cnidarians
--Bilateria
---Prototomes
----Sprialia
-----Platyzoa:flatworms, rotifers
-----Trochozoa: mollusks, annelids
----Ecdysozoa: nematodes, arthropods
---Deutersomes: echinoderms
Terms : Hide Images
| 517383810 | Phylum Echinodermata | -eucoelomate -deuterostomes -sedentary, slow moving, marine animals -five part radial symmetry -lack cephalization -have no brain or central nervous system -open circulatory system -large coelom functions in both respiration and circulation -locomotion and feeding by tube feet | |
| 517383811 | Class Asteroidea (starfish) | -superficial radial symmetry -some feed on bivalves -can extrude cardiac muscle -dermal gills -pedicillaria | |
| 517383812 | Class Echinoidea (sea urchins, sand dollars) | -lack arms -five part radial symmetry -well protected by sharp spines -modified tube feet -feed by scraping algae off hard surfaces -Ecologically important: can devastate kelp beds | |
| 517383813 | Class Ophiuroidea (brittle stars) | -resemble starfish but have brittle arms -lack an anus -small, fast moving -carnivores, scavengers, and filter feeders | |
| 517383814 | Class Holothuridea (sea cucumber) | -sedentary marine animals -superficial five part radial symmetry -tube feet modified for filter feeding on plankton -mouth surrounded by tentacles that are covered in mucus -defensive mechanism: they evert sticky tubules out their anus when threatened, tubules are sticky or toxic | |
| 517383815 | Class Crinoidea (sea lilies) | -living fossils, sessile forms are ancient species, modern forms are mainly motile -mouth and anus atop disk, disk may be attached to a stalk -tube feet serve as filter feeders | |
| 517383816 | endoskeleton (echinoderms) | consists of numerous small plates covered by a thin epidermis | |
| 517383817 | spines | extend from the bodies of echinoderms | |
| 517383818 | tube feet | extensions of echinoderms water vascular system that stick out from the body and function in movement and obtaining food | |
| 517383819 | ampullae | the bulb that squeezes water into the tube foot | |
| 517383820 | madreporite | sievelike structure through which the water vascular system of an echinoderm opens to the outside | |
| 517383821 | ring canal | in echinoderms, a circular canal that is near the madreporite and that is part of the water-vascular system | |
| 517383822 | radial canal | a structure in echinoderms that runs the length of the arm, is part of the water vascular system | |
| 517383823 | mutable connective tissue | also known as catch connective tissue. Can change from solid to near liquid at will, can shed arms to escape danger | |
| 517383824 | dermal gills | in echinoderms, small finger-like projections of skin that stick out near the base of the spines, aid in respiration and excretion (accomplished by diffusion) | |
| 517383825 | pedicillaria | small stalks that project from the skin that bear tiny pincers; help capture tiny prey; used to repel boarders | |
| 517383826 | reproduction in echinoderms | asexual-fragmentation sexual-external fertilization -larvae are bilaterally symmetric, cephalized, reflect ancestral echinoderms | |
| 517383827 | Movement of water in Echinoderms | Water flows through the madreporite, passes through the ring canal, passes through the radial canals (arms), through the tube feet. Then longitudinal muscles contract to move the feet back and forth. | |
| 517383828 | Nerve Ring | the nervous system of echinoderms, five branches from nerve ring enervate the five arms | |
| 517383829 | Classes of Echinoderms | Class Asteroidea - starfish Class Echinoidea - sea urchins, sand dollars Class Ophiuroidea - brittle stars Class Holothuridea - sea cucumber Class Crinoidea - sea lilies |
