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