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Fossil shell is of Lytoceras cornucopia from Isère (France). Credit: Hectonichus.

Ammonoids is a lecture and an article from the school of geology based in part on paleontology and on gene transcription, with an eye towards describing ammonoids genetically.

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Quiz[edit | edit source]


1 Yes or No, An ammonoid is an extinct cephalopod mollusk with a flat-coiled spiral shell.


2 Which of the following are phenomena associated with mollusks?

a structured nervous system
a prominent head
bilateral body symmetry
muscular hydrostats
a mantle with a cavity for breathing and excretion

3 Yes or No, Snails are mollusks with coiled spiral shells that are also ammonoids.


4 The portion of a promoter in which an ammonite promoter is likely to be found is which of the following?

dispersed promoter
proximal promoter
downstream promoter
distal promoter
focused promoter
core promoter

5 Yes or No, A body wall of a mollusc, from which the shell is secreted, is called a mantle.


6 Which of the following are phenomena associated with cephalopods?

muscular hydrostats
a prominent head
lobate suture lines
frilled suture lines
a structured nervous system

7 Which of the following are phenomena associated with ammonoids?

suture lines
muscular hydrostats
prominent head
a structured nervous system

8 True or False, DNA has been extracted from a Lower Cambrian ammonite.


9 Complete the text:

The scientific study of

(often extended to all

) is called

. It is a branch of


10 Complete the text:

Match up the type of cephalopod with each of the possibilities below:
Agoniatite - A
Ammonite - B
Belemnoid - C
Ceratite - D
Clymeniid - E
Coleoid - F
Goniatite - G
Lytocerate - H
Nautiloid - I
Nostoceratid - J
Phyllocerate - K
Prolecanites - L
Fossile J 2.jpg

Parapuzosia seppenradensis 4.jpg

Phylloceratidae - Phylloceras serum.JPG

Ceratites nodosus MHNT.PAL.CEP.2001.105.jpg


Phragmoteuthis conocauda.JPG

Clymenia laevigata.JPG

Orthoceras BW.jpg

Eichstätt Trachyteuthis hastiformis.jpg

Lytoceratidae - Lytoceras cornucopia.jpg

Gasteropods - Ammonites - Agoniatites obliquus.JPG

Prolecanites sutures.png


Hypotheses[edit | edit source]

  1. Ammonoids are all cephalopods that can grow an external shell.

See also[edit | edit source]

External links[edit | edit source]

{{Anthropology resources}}{{Gene project}}

{{Medicine resources}}{{Phosphate biochemistry}}