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Table 1 Summary of changes to data matrix for phylogenetic analysis

From: The impact of taphonomic data on phylogenetic resolution: Helenodora inopinata (Carboniferous, Mazon Creek Lagerstätte) and the onychophoran stem lineage

New anatomical interpretations
 #36 (?) - > (1) Annulations
 #38 (?) - > (0) Annulations
 #67 (?) - > (0) Limbs
 #75 (?) - > (1) Posterior
Ambiguity due to lack of preservation
 #24 (1) - > (?) Mouth position
 #52 (0) - > (?) Midgut glands
 #62 (1) - > (?) Dermal papillae
Genuine absence of decay resistant characters
 #12 (?) - > (0) ; nc Jaws
 #13 (?) - > (-) ; nc Jaws
 #14 (?) - > (0) ; nc Jaws
 #15 (1) - > (0) ; (1) - > (?) Slime papillae
 #46 (?) - > (-) ; nc Claws
 #64 (1) - > (0) ; (1) - > (?) Claws
 #65 (0) - > (–) ; (0) - > (?) Claws
 #66 (1) - > (–) ; (1) - > (?) Claws
 #80 (?) - > (-) ; nc Claws
  1. Three different types of modifications to the character coding for Helenodora inopinata (=Ilyodes), based on data presented by Yang et al. [4] with their character numbers used. Modifications refer to both coding methodologies unless two changes are shown separated by a semi-colon, in which case the first refers to the decay-informed coding, the second to conservative coding, nc = no change to matrix. The aspect of the anatomy of H. inopinata in question is reported for reference. Complete data matrix presented in Additional file 8 (character key in Additional file 6)