Ammonoid 0.0 / 5 ? GeologyAmmonoidsA2/A-levelOCR Created by: HannahCavielCreated on: 08-03-17 10:18 a body feature enabling strength and protection ribs 1 of 13 recessed area next to the keel sulcus 2 of 13 projected ridge which may have stabilised the ammonite during movement keel 3 of 13 tub which interconnects the chambers siphuncle 4 of 13 support for the siphuncle septal neck 5 of 13 opening through which the animal protruded aperture 6 of 13 the wall which closes off the body chambers septum 7 of 13 the diameter of the depression between the inside margins and the last coil umbilicus 8 of 13 inner coils are hidden by the next coil involute 9 of 13 all coils are visible evolute 10 of 13 class of ammonoids cephlapoda 11 of 13 phylum of ammonoids mollusca 12 of 13 mode of life for ammonoids nektonic 13 of 13
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