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GCSE
A Level & IB
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More cards in this set
Card 6
Front
Symmetry: 5 fold radial symmetry
Back
Card 7
Front
Position of mouth: centre of oral surface (bottom), contains jaws
Back
Card 8
Front
Size of tubercles: tubercles large, well spaced out
Back
Card 9
Front
Labrum: present
Back
Card 10
Front
Shape of ambulacra and pore pairs: ambs extended from apical system to mouth, one pair of pores per plate, pores round and close set
Back
Card 11
Front
Fasciole: smooth bands of ciliated spines
Back
Card 12
Front
Plastron: not present
Back
Card 13
Front
Position of anus: in centre of apical system in centre of aboral surface
Back
Card 14
Front
Position of mouth: lies either in centre of oral surface or towards anterior margin and lacks jaws
Back
Card 15
Front
Apical system: does not enclose the periproct it is small and may be linear
Back
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