Mantle Sac-Like Structure That Contains the Internal Organs and Secretes the Shell

Test 7 Checklist

•Mollusks

–Characteristics

•Mantle Sac-like structure that contains the internal organs and secretes the shell

•RadulaMuscular, tongue-like organ that is covered in various types of tooth-like structures for feeding

•Muscular footMuscular structure used for movement, defense, or burrowing

•SymmetryMollusks have bilateral symmetry

–Gastropodsincludes snails, whelks, slugs

•FeedingGrazers or predators

•DefenseSome have shell, some are poisonous, some use nematocysts stolen from jellyfish they have eaten

•StructureHave a single shell or no shell, have a radula,

–Bivalvesincludes clams, oysters, scallops

•FeedingFilter feeders

•DefenseShells for protection, Use muscular foot to burrow under seafloor or push away from predators

•StructureTwo shells, no distinct head

–Cephalopodsincludes squid, cuttlefish, octopus

•Feedingpredators, use tentacles to capture prey

•Defenseink, jet propulsion

•Structurefoot is modified into multiple tentacles, cuttlefish have hard shell, squid has lightweight pen, and octopus has no shell. Octopus is highly intelligent.

•Echinoderms

–Characteristics

•Water vascular systemuses water pressure to power the tube feet

•Tube feetpart of the watervascular system, used to walk on the seafloor

•5 part body planmost body parts in multiples of 5, including sea star arms and urchin teeth (urchin mouth parts called “aristotle’s lantern”)

•SymmetryEchinoderms exhibit radial symmetry

•Support structureendoskeleton made of calcium carbonate

–Crinoidea

•Examplessea lilies, sea feathers

•Structurearms that extend into the water with spines for suspension feeding

•FeedingSuspension feeders

•MovementSessile

–Asteroidea

•ExamplesSea stars

•StructureCentral disc with five wide arms

•FeedingPredators

•MovementWalk using tube feet

–Ophiuroidea

•ExamplesBrittle Stars

•StructureCentral disc with long, thin arms covered in spines

•FeedingSuspension feeders

•Movementmove using arms

•DefenseBreak off arms to distract predators, then regenerate them

–Echinoidea

•ExamplesUrchins, Sand dollars

•StructureNo arms, body contained inside a “test”

•FeedingDeposit feeders or grazers (herbivores)

•MovementUse tube feet to walk along seafloor

–Holothuroidea

•ExamplesSea Cucumber

•StructureElongated body

•FeedingDeposit feeders

•MovementUse tube feet to walk along sea floor

•Arthropods

–Characteristics

•CoveringLightweight, protective exoskeleton made of chitin

•AppendagesJointed appendages

•SymmetryBilateral Symmetry

–Barnacles

•FeedingSuspension feeders

•Appendagesfeather-like appendages used for catching food

–Copepods

•ImportanceServe as important link between plankton and larger fish in the food chain

–Decapods

•Appendages10 legs

•Feedingpredators, scavengers

•Chelipedsappendages modified into pincers

–Krill

•ImportanceServe as important link between plankton and larger fish in the food chain

•Lifestyle live in large “swarms”