Table 2

Comparison between Schmeissneria and other possibly related fossil taxa.

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


Note the characters (enclosed ovule, vertical septum) distinguishing Schmeissneria from the others. *: information from this paper.

Wang et al. BMC Evolutionary Biology 2007 7:14   doi:10.1186/1471-2148-7-14

Open Data