| Cx IV: prolateral apophysis | bifid, short, diagonally oriented | simple, curved tip, points backwards |
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| TrIV: prolateral apophysis | small, ax-like | bilobate, distal lobe is short and parallel to border (P. reedii) or large, finger-like, pointing sideways (P. cristobalia) |
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| TrIV: apical prodorsal finger-like apophysis | large, oriented upwards, inclined medially | oriented sideways, either short (P. reedii), or long and parallel to the former apophysis (P. cristobalia) |
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| FeIV: prodorsal basal apophyses | 1–2, conic + acute granules | none |
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| FeIV: retrodorsal apophysis | large; followed by small apophyses of decreasing size | either large (P. reedii) or small (P. cristobalia), it is only followed by granulation on the medial side |
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| FeIV: proventral row of tubercles / apophyses | only a row of tubercles, no subapical apophysis | a large subapical apophysis pointing sideways, either alone or with 2–3 smaller ones in a row |
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| PaIV: ventral acute apophyses | two | one (P. reedii) or two (P. cristobalia) |
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| Ti IV: ventral acute apophyses | one basal, three distal, a large gap in between (2–3 rudimentary tubercles may exist) | one basal, three distal, in between one or two additional |
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