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Dicroidium robustum
Taxonomy
Dicroidium robustum was named by Abu Hamad et al. (2008). It is considered to be a form taxon. Its type specimen is Specimen PbO S103, illustrated on Plate XIX, 1, a multi organs (Frond with cuticle), and it is a compression fossil. Its type locality is Wadi Himara, which is in a Lopingian fine channel fill siltstone/claystone in the Um Irna Formation of Jordan.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2008 | Dicroidium robustum Abu Hamad et al. pp. 116-117 figs. Plates XIX–XX |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Dicroidium robustum Abu Hamad et al. 2008
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Abu Hamad et al. 2008 | Bifurcated(?) fronds, bipinnate, with very large pinnules. Pinnules densely spaced, broadly tongue-shaped to rhomboidal apices rounded. Pinna terminals large, tongue-shaped, consist- ing of several fused pinnules.
Leaves amphistomatic; stomata randomly distributed on upper and lower pinnule surface, abundant on upper pinnule surface and comparatively more abundant on lower pinnule surface. Epidermal cells of upper pinnule surface larger than those of lower pinnule surface. Anticlinal walls very thin. No differentiation into costal and intercostal fields. Stomata randomly distributed and oriented. Guard cells with very prominent stomatal ledges and wood lamellae. Stomatal complexes usually with four subsidiary cells, usually two lateral, slightly weaker cutinised subsidiary cells and two normally cutinised polar cells; lateral neighbouring cells usually longer than guard cells. |
Measurements
No measurements are available
No ecological data are available