Mollusca		Cephalopoda
CYRTOSOMA		Cladogram

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Cephalopoda Cladogram

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

<==o CEPHALOPODA (cephalopods)
   `--o PALCEPHALOPODA [Nautiloidea sensu lato]
      `--o † PLECTRONOCERIDA
         |-- † YANHECERIDA
         |-- † PROTACTINOCERIDA
         `--o †ELLESMEROCERIDA
            `--+-+- Ellesmeroceratidae
               | `-- (other Ellesmerid families)
               |--+-- ENDOCERIDA
               |  `-- †INTELJOCERIDA
               |?-- †DISCOSORIDA (position uncertain)
               |--o CYRTOCERTININA
               |  |-- Bathmoceratidae
               |  |--+ Eothinoceratidae
               |  |   `-- Cyrtocerinidae
               |  `?--+ †ACTINOCEROIDA (position uncertain)
               | ?-- †PSEUDORTHOCERIDA (position uncertain)
               |--+ Bassleroceratidae
               |  `--o NAUTILOIDEA [Tetrabranchiata]
               |     |--o †TARPHYCERIDA
               |     |  `--+ †TARPHYCERINA
               |     |     `-- †BARRANDEOCERINA
               |     `--o †ONCOCEROIDA
               |        `--+ Graciloceratidae
               |           `--+ Oncoceridae
               |              |-- Other Oncocerid families
               |              |--+ Brevicoceratidae (possible Nautilid ancestors)
               |              `--+ Acleistoceratidae (possible Nautilid ancestors)
               |                 `--o NAUTILIDA
               |                    |-- †RUTOCERINA
               |                    `--+-- †LIROCERINA
               |                       |?- †TAINOCERATOIDEA
               |                       |?- †CLYDONAUTILOIDEA [Clytonautilina]
               |                       `--o NAUTILINA
               |                          |-- †Syringonautilidae
               |                          `--o Nautilidae
               `--+ Baltoceratidae
                  `--o NEOCEPHALOPODA
                     `--o †ORTHOCERIDA
                        `--+ Orthoceratidae
                           |-- Other Orthocerid families
                           |--+ Clinoceratidae
                           |  `-- †ASCOCEROIDA
                           `--o †BACTRITIDA
                              |-- †AMMONOIDEA ( ammonites)
                              `-- COLEOIDEA Bather, 1888 [Dibranchiata] (including belemnites)