| Mollusca | ![]() |
Cephalopoda |
| CYRTOSOMA | Cladogram |
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CYRTOSOMA |--+--SCAPHOPODA | `--CEPHALOPODA | |--Plectronocerida | `--+--Ellesmerocerida | |--Endocerida | |--Actinocerida | |--Pseudorthocerida | |--Discosorida | `--+--NAUTILOIDEA | `--NEOCEPHALOPODA | |--Ammonoidea | `--COLEOIDEA | |--DECAPODIFORMES | `--VAMPYROPODA `--Gastropoda |
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<==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)
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