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WG 2
Mark Sutton and Catalina Perales-Raya A phylogeny of neocoleoid cephalopods: 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 Octopodiformes) 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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