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Fig. 3 | BMC Evolutionary Biology

Fig. 3

From: Eobowenia gen. nov. from the Early Cretaceous of Patagonia: indication for an early divergence of Bowenia?

Fig. 3

Comparison between the cuticle of Eobowenia incrassata (a, c, e, specimen v52265) and Bowenia spectabilis (b, d, f). a Stomata on the abaxial cuticle of Eobowenia incrassata, showing the monocyclic architecture and the darker-staining pavement cells. The thickenings of the substomatal complexes are preserved under some stomata. b Stomata on the abaxial cuticle of Bowenia spectabilis, showing similar monocyclic stomatal architecture and the darker-staining (thickly cutinised) pavement cells. c Detail of two stomatal complexes in Eobowenia incrassata. The distal thickening (blue arrow) and the marginal ridge (white arrow) are clearly shown. d Detail of the stomatal complex in Bowenia spectabilis. Distal thickening (blue arrow) and the marginal ridge (white arrow) are present in the cuticle of the guard cells. e Detail of a stomatal complex in Eobowenia incrassata showing the partially preserved substomatal complex with secondary thickenings (black arrow). f The substomatal complex shown in a confocal stack of PI-stained leaflets of Bowenia spectabilis. Thickenings are indicated by the black arrow. b and d are light micrographs (b) or fluorescence pictures (d) of the cleared cuticle of Bowenia spectabilis. Scale bars: 50 μm

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