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WG 2

Mark Sutton and Catalina Perales-Raya A phylogeny of neocoleoid : first approach using living and fossil taxa

DATASET and METHODS 131 morphological characters and 79 taxa

 Main character selection designed “de novo” to facilitate analysis of taxa known from isolated gladii. Some “soft tissue” characters originate from previous analysis (Lindgren et al., 2004; Young and Vecchione, 1996) 31 living species (21 Decapodiformes and 10 )  78 Neocoleoidea taxa 47 extinct species (Palaeozoic and Mesozoic fossils)

 1 Outgroup taxon (codeable, non-coleoid): Nautilus Computational cladistic analysis: TNT

 Equal and implied weights were used. Analyses with the constraint of monophyly for living Decapodiformes were also performed

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METHODS: Homologies for coding fossil-extant gladii

RESULTS

 Consensus Tree constrained to decapodiform monophyly (implied weights k=3): results consistent with recent molecular phylogeny of extant cephalopods

 ”Octodiformes theory”: most Mesozoi c gldiladius- bearing cephalopods closely related to extant Octopodiformes

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RESULTS Idiosepius and Pohlsepia: resolved as a basal Sepia: BASAL TAXA coleoid (of uncertain affinities), but not an octopodiform

Belemnoidea within Jeletzkya: candidate for the crown group earliest representative of Decapodiformes Decapodiformes, but poorly characterized at present

Oegopsida and Bathyteuthoidea closely related

Marekites and Eoteuthoides: Exceptions to “Octopodiforms Theory” Rossia, Spirula, Spirula and Gonatus consistent Gonatus: difficult association: SIPHUNCLE genera but agreement with recent molecular results

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Octopodiformes clade

Vampyroteuthis in Teudopseina group and sister of the octopoda

Plesioteuthidae: Fossil sister group to Japetella: difficult genus but agreement the crown-group Octopoda with recent molecular results

Fossils Palaeoctopus, Keuppia and Styletoctopus fall within octopopod crown-group

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Thanks for your attention!

WG 2

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