Cephalopoda Flashcards
Molluscan characteristics in Cephalopoda (3)
Radula
Molluscan-style gill (non-ciliated ctenidium)
Shell-secreting mantle (but reduced or lost in extant cephalopods)
Distinctive characteristics (4)
Septate shell – internal separation via septa
Highly modified foot
prehensile appendages
funnel
Nautilus
primitive cephalopod characteristics
gas-filled chambers (buoyancy)
External shell, many tentacles, no suckers, eternal shell, hood derived from tentacles
Diel vertical migration
Squid
Muscular mantle
Pumping water through the mantle cavity
Radial muscles contraction pulls water in
circular muscles contraction ejects water out
Image forming eyes
Vascular system
ctenidia to systemic heart down to capillaries and body to branchial hearts back to ctenidia
High metabolic rate
ventilation of gills by pumping of muscular mantle
closed circulatory system - capillary beds
Systemic and branchial hearts
Reproduction
no free-swimming larval stage
eggs on objects
