Belemnites
- Created by: rosie.may7
- Created on: 02-05-16 17:33
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- Belemnites
- Morphology
- Eye
- For sight
- Phragmacone
- Chambered part in the centre of the guard which during life would have been filled with gas for buoyancy
- Pro-ostracum
- Extension of the guard, possibly for protection from damage. Covered the head and tentacles
- Tentacles
- Part of the soft tissue used to propel the organism backwards
- Protoconch
- First chamber of the Phragmacone
- Siphuncles
- Tube linking chambers which controlled the amount of gas in each chamber, and so controlled the position of the organism in the water column
- Guard
- solid internal skeleton
- Eye
- Mode of life
- Nektonic
- Vertical movement controlled by gas chambers
- Horizontal movement controlled by tentacles
- alignment of the guard in sediment can be used to determine the palaeocurrent direction
- Mollusca, Cephelopoda
- Devonian to cretaceous
- Extinct
- Morphology
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