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no nerves or muscles
No true tissues
No definite symmetry
capable of regeneration
jellies, corals, anemones
have circle of tentacles around mouth
has 2 body plans, the medusa and the polyp
have nematocysts or cnidocytes (stinging cells)
can be either sessile or motile (see classes) depending on stage in life cycle
2 tissue layers: Epidermis and Gastrodermis with Mesoglea in between
Otherwise known as moss animals or sea mats
colony forming animals
Lophophores -- ciliated tentacles around mouth
sea stars, urchins, cucumbers, sand dollars
Meaning spiny skin
Water Vascular System
Anthozoa-- corals, sea anemones
Cubozoa-- Sea wasps, box jellies
Hydrozoa-- hydroids (man-of-war)
name means "comb bearer"
no stinging cells, instead they have adhesive structures called colloblasts
include comb jellies
8 rows of "comb plates"
fused rows of cilia
Move with whip-like motion
Abundant Interstitial Species
Gastropoda--Snails & slugs
Pelecypoda--mussels, clams, oysters
Polyplacophora - Chitons
smiley/frowney face shell thing
they are sessile, two-shelled, marine animals with an external morphology resembling pelecypod mollusks
Attachment structure: attached to the substrate by means of a fleshy "stalk" or pedicle
Class Malacostraca— lobsters, crabs, shrimp
Class merostomata— horseshoe crabs
Class pycnogonida— sea spiders
Echinoidea--sea urchins and sand dollars
Ophiuroidea--brittle stars and basket stars
Chrinoidea-- feather stars and sea lilies
Body wall covered by leathery tunic
Nerve chord on larvae
Includes sea squirt, sea grape, sea liver, sea pork
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