33: Protostomes

Phylum: Platyhelminthes

• flatworms

• Collimated belly (move water)

• Regeneration

Phylum: Rotifera

• corona: cilliates lobes on head to pull into mouth, phytoplankton

Phylum: Mollusca

• snails, clams, octopi

• Mantle: outer body; secretes this from sea water

• Foot: primary locomotion

• Gills: ctenidia, paired gills

• Radula: rasping tongue

Phylum: Mollusca, Class: Gastropoda

• snails, slugs, limpets

• Eyes on stalks

• Torsion: twist coil in an 8 shape to fit body in shell

Phylum: Mollusca, Class: Nudibranch

• naked gills

• Kleptocnida: eat hydrozoans to take nematocyts to transfer to body surface

• Tastes like shit

Phylum: Mollusca, Class: Bivalvia

• clams, scallops, mussels

• 2 shells (valves) for mouth and ass

• Siphons: long, buried for gas exchange and foos

• No radula or head

Phylum: Mollusca, Class: Cephalopods

• only one with circulatory system

• Change color and texture

• Foot = arms

• Beaklike jaws

Phylum: Annelida

Segmented worms, repeated units of body

Phylum: Annelida, Class: Polychaeta

• clamworms, scale worms, lugworms, sea mice, tube worms

• Paired parapodia on segments (motion and gas exchange, chaetae on parapodia)

• Gonochoric (male or female)

• Riftia: no stomach/mouth, hydrothermal vents, sulfur oxidizing bacteria synthesis

Phylum: Arthropoda

• segmentation: specialized tagmata (head, thorax, abdomen)

• Exoskeleton: chitin and protein, protects against water loss, ecdysis

• Jointed appendages: uniamous (one, point), biramous (two, split)

• anthropodeyes: compound, ommatidia (movement), ocelli (light and dark)

Phylum: Annelida, Subphylum: Chelicerata

• spiders

• Chelicerae: anterior appendages, fangs/pinchers

• 2 tagmata

Phylum: Annelida, Subphylum: Chelicerata, Class: Spiders, Order: Aranaea

• silk webs from protein

• From spinnerets

• Actively hunt prey

Phylum: Annelida, Subphylum: Crustacea

• crabs, shrimp, barnacles

• 3 tagmata

• 2 antennae, 3 chewing appendages, various legs

Phylum: Annelida, Subphylum: Crustacea, Class: Barnacles, Order: Cirripedia

• sessile adults

• Feathered feet

Phylum: Annelida, Subphylum: Hexapoda

• 3 tagmata

• Ommatidia: compound eyes