Cephalopod
- Created by: rosie.may7
- Created on: 03-05-16 11:18
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- Cephalopods
- Morphology
- Soft parts
- Eye
- Tentacles
- Internal
- Septum
- Septal neck
- Siphuncle
- body chamber
- Protoconch
- Apperture
- External
- Growth lines
- Ammonoids
- Ribs
- Keel
- Soft parts
- Types of coiling
- Involute
- Evolute
- Planispiral
- Mode of life
- Nektonic
- Lateral movement using tentacles. When in danger, water circulated through the mantle for respiration, is squirted out to propel the organism backwards
- position in the water column is controlled by the gas to liquid ratio within the empty chambers. Controlled by the siphuncle.
- Hunter killer
- cephalopods predated on their prey
- Nektonic
- Evolution
- Changes in suture lines
- From simple nautiloid, through Goniatitic, saddle and lobed Ceratitic, to frilly complex ammonitic suture.
- Changes in internal structure
- Septal necks change from facing towards the protococh to towards the aperture.
- siphuncle moves from the centre of the chambers to the other edge.
- Changes in external structure
- From unornamented nautiloids to heavily ornamented ammonites
- Heteromorph
- Exhibit loose coiling in more than one plane. Often referred to as uncoiled ammonites.
- Changes in suture lines
- First appeared in Cambrian
- Ammonoids became extinct at the K-T extinction
- Nautiloids are still extant
- Mollusca, Cephalopoda
- Morphology
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