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Echinoderms

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by

Leah York

on 6 April 2010

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Transcript of Echinoderms

Echinoderm Characteristics Calcareous endoskeleton consists of a series of calcium carbonate plates called ossicles ossicles are held in place by connective tissues and are covered by an epidermal layer skeleton is frequently modified into fixed spines that project from the body surface pentaradial symmetry body parts arranged in fives, or a multiple of five, around an oral-aboral axis allows uniform distribution of sensory, feeding, and other structures around the animal water-vascular system series of water-filled canals and their extensions (tube feet) ring canal that surrounds mouth tube feet-extension of canal system and usually emerge through openings in skeletal ossicles; often has suction cup at distal end Digestion echinoderms have a mouth and stomach area relatively big gut area Hemal system consists of strands of tissue that encircle an echinoderm near the ring canal
run into each arm near the radial canals
derived from the coelom
circulates fluid using cilia that line its channels
fucntion is largely unknown, but it probably helps distribute nutrients absorbed from the digestive tract
may aid in the transport of large molecules, hormones, or coelomocytes nervous system consists of a nerve net, nerve ring, and radial nerves
have an eyespot that detects light Class Myxini hagfish
about 20 species divided into four genera
heads supported by cartilaginous bars
brains enclosed in a fibrous sheath
lack vertebrae and retain the notochord as the axial supportive structure
four pairs of sensory tentacles surrounding their mouths
ventrolateral slime glands
found in cold-water marine habitats
live buried in the sand and mud of marine environments
feed on soft bodied invertebrates; scavenge dead/dying fish
hagfish don't really have jaws, but two pairs of rasps on top of a tongue
newly hatched hagfish are miniature versions of adults
young hagfished have both male and female sex organs
hagfish can sneeze to unclog slime from their nostrils
Sensory
Tentacles Slime
Glands Median
Fin vagina dfdafsdfas d
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