9. Covered by a cuticle with a calcareous scales/spicules
embedded in it
Covered by a ____ with a calcareous ___________
embedded in it
Poorly developed ____
Mixture of ______ and _______ features
_____ like molluscs
Worm like
molluscs
Mixture of primitive and specialised features
Poorly developed head
Reduction of foot
Loss of radula and loss of gills
Aplacophora
Loss of ____ and loss of____
Reduction of ___
10. Worm like molluscs
Mixture of primitive and specialised
features
Poorly developed head
Covered by a cuticle with a calcareous
scales/spicules embedded in it
Reduction of foot
Loss of radula and loss of gills
11. Worm like molluscs
Mixture of primitive and specialised
features
Poorly developed head
Covered by a cuticle with a calcareous
scales/spicules embedded in it
Reduction of foot
Loss of radula and loss of gills
12. Worm like molluscs
Mixture of primitive and specialised
features
Poorly developed head
Covered by a cuticle with a calcareous
scales/spicules embedded in it
Reduction of foot
Loss of radula and loss of gills
13. Worm like molluscs
Mixture of primitive and specialised
features
Poorly developed head
Covered by a cuticle with a calcareous
scales/spicules embedded in it
Reduction of foot
Loss of radula and loss of gills
14. Worm like molluscs
Mixture of primitive and specialised
features
Poorly developed head
Covered by a cuticle with a calcareous
scales/spicules embedded in it
Reduction of foot
Loss of radula and loss of gills
16. Highly adapted for ______ to rocks
No cephalic ___ or ______ , ___ indistinct
Multiple ___ and segmented ___ , but other
body parts are not ________
Polyplacophora
Highly adapted for adhering to rocks
No cephalic eyes or tentacles, head indistinct
Multiple gills and segmented shells, but
other body parts are not segmented
Shell is eight overlapping plates
Probably diverged early from the main line of
molluscan evolution
Shell is ___ overlapping plates
Probably diverged ___ from the main line of
molluscan evolution
18. Bivalvia
Laterally compressed
Shell of two hinged halves, encloses the body
Infaunal or epifaunal
Filter feeders
Water comes in through a siphon and food is
extracted using the gills
Poorly cephalised
______ compressed
Shell of __ hinged halves, encloses the body
__faunal or __faunal
___ feeders
Water comes in through a ____ and food is
extracted using the ___
____ cephalised
20. Scaphopoda
Tusk or tooth shells
Elongated cylindrical tube, open at both ends
Burrowing marine molluscs
___ or ____ shells
Elongated _______ tube, ___ at both ends
_______ marine molluscs
22. Gastropoda
30,000 species
Development of the head
Only terrestrial molluscs
Motile; foot used for crawling, burrowing or
even swimming
Conversion of the shell to form a
deep protective retreat
Torsion
_____ species
Development of the ____
Only _______ molluscs
Motile; foot used for ______, _______ or even
_______
Conversion of the shell to form a
deep _______ retreat
24. Gills, anus, mantle cavity now located behind the head
Torsion
Twisting of the body through 180 degrees
counterclockwise
May alllow the withdrawal of the head into the
shell before the foot
Torsion and spiraling of the shell are independent
Twisting of the body through 180 degrees
____________
___, ___, _____ cavity now located behind the head
May alllow the withdrawal of the ___ into the
shell before the foot
Torsion and ______ of the shell are independent
26. Cephalopoda
Head has prehensile tentacles and arms
Jet propulsion
Carnivorous
Majority 6-70cm
Giant deep sea squid Architeuthis <16m (body 4m
circumference, 6m long tentacles)
Head has prehensile ______ and ____
__ propulsion
___ivorous
Majority ___cm
_______________Architeuthis <16m (body 4m
circumference, 6m long tentacles)
