Card Set Information
Brachiopoda, Mollusca (Polyplacophora, Gastropoda, Cephalopoda and Bivalvia)
What are the apomorphies of Brachiopoda?
Bivalve shell and mantle
: two arms, filters sea water
: pouches in stomach, help digest food
What are the apomorphies of Mollusca?
Dorsal mantle has secreted chitin-protein cuticle and calcareous
needle-like structes, make up skeleton
: tiny teeth, used to scrape food off surface
Foot and paired peda retractor muscles
Teraneural nervous system
Foot for locomotion and food aquisition
What are the apomorphies of Polyplacophora?
Eight dorsal, overlapping valves
Valves consist of tegmentum and articulamentum
What are the apomorphies of Ganglioneura?
Neuron cell bodies concentrated in paired ganglia
Single pair of foot retractor muscles
What are the apomorphies of Gastropoda?
: rotation of visceral muscles
Usually coiled, asymmetrical
Mantle cavity is anterior
Streptoneurous nervour system
Left gonad lost
What are the apomorphies of Cephalopoda?
: inhabits the open sea
Carnivorous with beaks, tentacles
Muscular mantle for ventilation and swimming
Crystalline style lost
Macrolethical eggs with discoid cleavage
What are the apomorphies of Bivalvia?
Bivalve shell joined by a dorsal movable hinge