Mollusca		Cephalopoda
CYRTOSOMA		References

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Cephalopoda References

CYRTOSOMA  
|--+--SCAPHOPODA
|  `--CEPHALOPODA  
|     |--Plectronocerida  
|     `--+--Ellesmerocerida  
|        |--Endocerida  
|        |--Actinocerida  
|        |--Pseudorthocerida  
|        |--Discosorida  
|        `--+--NAUTILOIDEA
|           `--NEOCEPHALOPODA
|              |--Ammonoidea
|              `--COLEOIDEA
|                 |--DECAPODIFORMES
|                 `--VAMPYROPODA
`--Gastropoda

Dzik, J (1984), Phylogeny of the Nautiloidea.  Pal. Pol. 45: 1-220.  Plectronocerida.  

Engeser, T., 1998: The Fossil Coleoidea Page: Classification & Phylogenetic tree. --iNet: The Fossil Coleoidea Page: http://userpage.fu-berlin.de/~palaeont/fossilcoleoidea/welcome.html

Engeser, T., 1998: Fossil Nautiloidea. --iNet: The Fossil Nautiloidea Page: http://userpage.fu-berlin.de/~palaeont/fossilnautiloidae/fossnautclassification.htm

Fenton, MA & CL Fenton (1958), The Fossil Book.  Doubleday.  

Flower, RH (1955), Saltations in nautiloid coiling. Evolution 9: 244-260.

Flower, RH & BA Kummel (1950), A classification of the Nautiloidea, J. Paleontol., 24: 604-616.

Moore, Lalicker and Fischer (1952), Invertebrate Fossils, 1952, McGraw-Hill., 766 pp.

Sweet, Walter C., 1964, Nautiloidea -- Oncocerida: Treatise on Invertebrate Paleontology. Part K. Mollusca 3. Cephalopoda -- General features -- Endoceratoidea -- Actinoceratoidea -- Nautiloidea -- Bactritoidea: Geological Society of America, and University of Kansas Press, New York, New York and Lawrence, Kansas, p. K277-K319.

Teichert, C (1988), Main Features of Cephalopod Evolution, in MR Clarke & ER Trueman (eds.), The Mollusca vol.12, Paleontology and Neontology of Cephalopods.  Academic Press.  Plectronocerida.