MARINE Invertebrates BIOL 505 Understanding Marine Invertebrates, Their Environments and Processes.
Marine Invertebrates
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Transcript of Marine Invertebrates
Common Common InvertebratesInvertebrates
ofofMonterey BayMonterey Bay
IntroductionIntroduction
Marine Invertebrates: Marine Invertebrates: SpongesSponges Jellyfish, Corals, HydroidsJellyfish, Corals, Hydroids Comb JelliesComb Jellies Clams, Snails, OctopiClams, Snails, Octopi Crabs, Shrimp, Lobsters, CopepodesCrabs, Shrimp, Lobsters, Copepodes Sea Stars, Brittle StarsSea Stars, Brittle Stars Marine WarmsMarine Warms
Phylum Porifera: Phylum Porifera: SpongesSponges
ameobocytesameobocytes
ChoanocytesChoanocytes
Reproduce either sexually or asexuallyReproduce either sexually or asexually
Phylum Cnidaria: Phylum Cnidaria: Jellyfish, Corals, and Jellyfish, Corals, and
HydroidsHydroids Acoelomates (no body cavity)Acoelomates (no body cavity)
Nitoblasts – stinging cellsNitoblasts – stinging cells
Both sexual and asexual reproduction cyclesBoth sexual and asexual reproduction cycles
Staghorn corals reproducing: Staghorn corals reproducing: http://www.arkive.org/staghorn-corals/acropora-spp/video-09.html
Phylum Ctenophora: Phylum Ctenophora: Comb JelliesComb Jellies
Mistaken for jellyfishMistaken for jellyfish
No stinging cellsNo stinging cells
Eight rows of comblike plates arranged Eight rows of comblike plates arranged longitudinally around the body – these longitudinally around the body – these combs move the ctenophore forwardcombs move the ctenophore forward
They have a mouth, stomach, but no anusThey have a mouth, stomach, but no anus
Phylum Mollusca: Clams, Phylum Mollusca: Clams, Snails & slugs, and Snails & slugs, and
OctopusOctopus All mullusks have in common: a footAll mullusks have in common: a foot
Four classes: Four classes: CephalopodaCephalopoda BivalviaBivalvia GastropodaGastropoda PolyplacophoraPolyplacophora
Class Cephalopoda Class Cephalopoda (head-foot)(head-foot)
OctopiOctopi
SquidsSquids
CuttlefishCuttlefish
The Chambered NautilusThe Chambered Nautilus
Shark vs. Octopus: Shark vs. Octopus: http://www.youtube.com/watch?v=p9A-http://www.youtube.com/watch?v=p9A-oxUMAy8oxUMAy8
Class BivalviaClass Bivalvia
ClamsClams
OystersOysters
ScallopsScallops
MusselsMussels
Escape response of Northern Abalone: Escape response of Northern Abalone: http://www.racerocks.com/racerock/archives/vhttp://www.racerocks.com/racerock/archives/vidabescape2a.htmidabescape2a.htm
Class GastropodaClass Gastropoda
Snails and slugsSnails and slugs
Limited sensory capacityLimited sensory capacity
The foot on the underside is used for locomotionThe foot on the underside is used for locomotion
Has a radula, a coiled, straplike tongue studded Has a radula, a coiled, straplike tongue studded with teethwith teeth
A Pleisia is a sea snail withut a shellA Pleisia is a sea snail withut a shell
http://www.seaslugforum.net/factsheet.cfm?http://www.seaslugforum.net/factsheet.cfm?base=acteeloibase=acteeloi
Class PolyplacophoraClass Polyplacophora
ChitonsChitons
Body covered in a shell that consists of Body covered in a shell that consists of eight symmetrical, overlapping plateseight symmetrical, overlapping plates
Can roll into a ballCan roll into a ball
Moves using a foot appendageMoves using a foot appendage
Uses the foot to cling to rocksUses the foot to cling to rocks
Phylum Mollusca: Crabs, Phylum Mollusca: Crabs, Shrimp, Lobster, Shrimp, Lobster,
CocopodsCocopods Range in size from a few mm to the giant Range in size from a few mm to the giant
squidsquid
Soft, unsegmented bodySoft, unsegmented body
Some protected by hard shell called a Some protected by hard shell called a mantle cavitymantle cavity
One or more hearts with open circulatory One or more hearts with open circulatory system (sinuses rather than blood vessels)system (sinuses rather than blood vessels)
Marine WormsMarine Worms
Several speciesSeveral species
Includes tube-dwelling marine warmsIncludes tube-dwelling marine warms
Peanut warms: Peanut warms: http://www.racerocks.com/racerock/eco/tahttp://www.racerocks.com/racerock/eco/taxalab/bio2002/phascolosomaa.htmxalab/bio2002/phascolosomaa.htm