Marine Biology Invertebrates

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radula
toothed tongue of mollusks
radial symmetry
symmetry based on a circle
gastropod
marine snails with shells made from their mantle
foot
source of mobility for chitons, abalone, gastropods
tube feet
source of mobility for echinoderms
Cnidarian
radial symmetry, jellies, corals, anemones
Mollusca
diverse phylum, octopi, clams, chitons, etc.
Porifera
no symmetry, filter feeders
Arthropoda
more species than any other phylum, exoskeleton, segmented appendages
Echinodermata
five part radial symmetry, sea stars, sea cucumbers, brittle stars, sea urchins
Annelida
bilateral symmetry, mouth, anus, segmented body, burrowers
filter feeding
feeding style of many invertebrates including all sponges
coral polyps
cnidarians with feeding tentacles that immobilize or kill prey using their nematocysts
the sea pig
a deep sea echinoderm with a pinkish body and swollen tube feet
siphon
squeezing water through this structure allows mollusks to propel themselves quickly through the water
the nautilus
a swimming mollusk with an air filled chambered shell
cone snails
some feed by catching fish with a poison harpoon
oysters
not native to Alaska but actively farmed for profit
Tube feet at the end of a seastars legs
used for tasting and smelling
sea urchins
can over-graze a kelp ecosystem creating urchin barrens
horseshoe crabs
have blue blood that can be used to test for the presence of bacteria in injectable drugs
madreporite
it allows water to pass into and out of a sea stars water vascular system
regeneration
the ability of sea stars to regrow damaged or lost arms
medusa
mobile swimming stage of the cnidarian lifestyle with tentacles hanging down
zooplankton
includes jellies, combjellies and the swimming larval stages of echinoderms and arthropods
phytoplankton
floating single celled organisms, that are photosynthetic, they make up the base of the ocean food chain and produce half the oxygen on the planet
diatoms
two clear silica, glass like shells encasing a photosynthetic plankton with a golden colored pigment
Barnacles
stationary, shelled, arthropods they filter feed with their segmented appendages
sea stars
the lions of the intertidal, they can eviscerate their stomach and digest their prey externally
plankton bloom
an explosive growth of a plankton population it requires nutrients and sunlight
bivalves
mollusks with hinged shells, including clams, mussels, and scallops
segmented antenae
used by copepods to swim and some lobsters for defense
swimmerettes
the swimming legs of shrimp, prawns, and crayfish
spicule
the glass like defensive structure of the sponges
pteropod
the flying, transparent, planktonic mollusk sometimes referred to as a sea angel or sea butterfly
cilliate
A large varied group of protists, are named for their use of the hair-like cilia to move and feed.
flagellate
an organism that possesses one or more whiplike appendages called flagella
algae
Plantlike protists, can be single-celled, multi-celled, or colonial
sook
A mature female crab
doubler
A male crab carrying a sexually mature female underneath him; a pair of mating crabs; buck and rider or carrier.
molt
process of shedding an exoskeleton and growing a new one
nematocyst
In cnidarians, a stinging cell that is used to inject a toxin into prey
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