to extend siphons out of the shell for respiration
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turritella mode of life
lives in high energy conditions, burrowing into the sediment with the aperture upwards. it is a filter feeder
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buccinum mode of life
carnivorous gastropod which actively moves along the sea floor. has a rasp-like tongue to eat their prey
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belemnite phylum
mollusca
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belemnite class
cephalopoda
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when were belemnites abundant?
Jurassic and Cretaceous
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Guard/Rostrum
solid internal calcite skeleton which counterbalanced the head. most commonly preserved
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Protoconch
first chamber
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phragmocone
chambered part in the guard which would have been filled with gas to aid buoyancy
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Proostracum
extension of the guard that potentially provided protection from damage
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siphuncle
tube linking the chamber which controlled the amount of air and gass entering the phragmocone controlling the belemnites buouyancy
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mode of life of belemnites
nektonic, active swimmers. they could swim both vertically and horizontally. they were good palaeocurrent indicators as they align after death to the currents
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