Mollusks and Arthropods

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Terms in this set (...)

Mollusk
soft body enclosed in a calcium carbonate shell
Mantle
thin layer of tissue that secretes the shell
foot
ventral, muscle used for locomotion
radula
a ribbon of small teeth that is used to feed
chitin
highly resistant carbohydrate(what radula is made out of)
coelon
body cavity
gastropods
largest, most common group of mollusks(snails, limpets, abalones, sea slugs)
nudibranchs (sea slugs)
no shell, colorful branches of the gut or exposed gills. often produce noxious chemicals as defense mechanism
Bivalves
clams, mussels, oysters. body is laterally compressed and enclosed in a shell with two valves
umbo
upper hump near the hinge of each shell, is the oldest part of the shell
mantle cavity
a large space between the two halves of the mantle
adductor muscles
used to close the valves
siphons
what a clam uses when buried to get oxygen and food
byssal threads
mussels use them to attach to rocks and other surfaces
fouling organism
organism that settles on the bottom of boats, pilings, and other submerged structures
cephalopods
predators that are specialized for locomotion (octopuses, squids, cuttlefishes)
ink sac
cephalopods have these to distract predators by emitting a cloud of dark fluid
chitons
can be identified by 8 overlapping shell plates that cover their slightly arched dorsal surface
crystalline style
continually rotates the food to help in its digestion
open circulatory system
blood flows out of vessels into open blood systems
ganglia
clusters of nerve cells located in different parts of the body
hermaphrodites
animals in which individuals have both male and female gonads
spermatophore
elongated packet of sperm
veliger
planktonic larva that has a tiny shell
Arthropods
segmented and bilaterally organism that includes crustaceans
crustaceans
a group of arthropods that includes barnacles, shrimps, lobsters, crabs
exoskeleton
tough, non-living external skeleton composed of chitin and secreted by the underlaying layer of tissue
molting
process arthropods must go through to grow (shed their exoskeleton)
antennae
used to sense surroundings
copopods
extremely abundant small crustacean
Barnacles
filter feeders that usually lie attached to surfaces
amphipods
small crustaceans with a curved body that is flattened sideways
isopods
similar to amphipods, but are have a flattened back
fish lice
parasites of other fishes
krileuphausiids (krill)
planktonic, shrimp-like crustaceans
carapce
covers the anterior half of the krill body
decapods
shrimps, lobsters, crabs
pereopods
five pairs of legs and has BIG MEATY CLAWS used for feeding and defense
maxillipeds
closer to mouth, turned forward and specialized to sort out food and push it in the mouth
cephalothorax
the fused head and thorax
abdomen
rest of the decapod body
scavengers
shrimps, specialists in feeding on bits of detritus on the bottom
hermit crabs
not true crabs, scavengers
true crabs
abdomen is small and tucked under the compact and typically broad cephalothorax
compound eyes
bundle of up to 14,000 light-sensitive units grouped in a mosaic
pleopods
swimmerets that are specialized appendages beneath the body
nauplius
most common crustacean larva