Molluscs Flashcards
Phylum mollusca 8 classes
gastropoda, bivalvia, cephalopoda, polyplacophora, scaphopoda, monoplacophora, caudofoveata, solenogatros
Mollusca cellular layout and coelom
triploblastic and ceolomic
mollusca main body plan
headfoot, visceral mass, mantle and mantle cavity.
Mollusca tooth structure
Radula
Mollusca circulatoroy system
open
class gastropoda do something special during development
torsion so they can hide head faster
gastropods reproduction mono or diecious
dioeceious (separate sexes) or monoecious, broadcast spawners, some livebearing, some protandrous (male then female)
gastropods which kind of larva
trochophore then veliger
Class bivalvia where does water enter and exit
incurrent aperture and excurrent aperture
Bivalvia what is oldest part of shell called
umbo
Bivalvia sex
diecous or monoecious or protendrous
Bivalvia internal or external fertilization
External
Bivalvia what kind of larva
trochophore and veliger
Glochidium are special why
Parasitic glochidium larvae attach to fish that are lured in by fake fish on parent
Class cephalopoda foot is what
arms and tentacles and funnel shaped siphon
Cephalopods mantle and circulatory system
muscular and surrounds body, closed. 3 hearths (systemic and 2 branchial)
Cephalopods shell
in nautilus: series of chambers in spiral and new chambers formed during growths (for buoyancy)
In others: pen is a reduced shell to add a bit of rigidity
Cephalopods nervous system
brain, ganglia, eye convergent from ours, cant move but no blind spot
Molluscan symmetry
bilateral
Class polyplacophora movement and type of shape
like snails, head reduces and flattened foot. shell with 8 articulatory valves
Class scaphopoda feeding tentacles
Captacula
Scaphopoda do what
bury themselves in sediment
Scaphopoda mono or diecious
dioecious
Class monoplacophora shape
shell with single valve
Class caudofoveata shape
no shell or muscular foot. Scales and wormlike
Class solenogastros shape
no shell, has calcareous spicules, foot is a pedal groove. dioecious
