Table 2 Comparison between Schmeissneria and other possibly related fossil taxa.
| Â | Appendage arrangement | Appendage shape | No. appendages per peduncle | Appendage opening orientation | Appendage apex | Seed/central unit position | Ovule completely enclosed | Vertical septum | No. ovules/seeds per cupule/central unit | Peduncle connects to |
|---|---|---|---|---|---|---|---|---|---|---|
Schmeissneria(young) [24,*] | Irregular | Globose, in pair | 2 | Away from axis | More or less extended | Within the sheathing envelope | + | + | 2? | Envelope |
Schmeissneria(mature)[24] | Irregular | Sickle-like, single | 1–2 | Away from axis | Wing-shaped | Below the wing, enclosed (?) | ? | ? | 1? | Seed? |
Ktalenia[75] | Opposite, subopposite | Globose | 1 | Down | More or less extended | Within cupule | - | - | 1–2 | Cupule |
Schizolepis[73] | Spiral | Bilobate | 1 | Up | Lobate | Axil of scale | - | - | 2 | Scale |
Drepanolepis[74] | Spiral | Sickle-like | 1 | Up | Wing-shaped | Axil of scale | - | - | 1 | Scale |
Leptostrobus[44,76] | Spiral | Round bivalvate | 1 (2 valves) | Away from axis | Round, thickened margin | Within capsule, axil of valves | - | - | Several | Cupule |
Caytonia[33,58] | Opposite | Globose | 1 | To axis | Extended lip | Within capsule | - | - | Several | Cupule |
Karkenia[24,77-78] | Irregular | Round-oval | 1 | To axis | Acuminate apex | On peduncle | - | - | 1 | Ovule/seed |