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Restrepophyllum chiguoides
Taxonomy
Restrepophyllum chiguoides was named by Passalia et al. (2010). It is considered to be a form taxon. It is a compression fossil. Its type locality is Estancia Bajo Grande, which is in an Aptian fluvial-lacustrine conglomerate/sandstone in the Anfiteatro de Ticó Formation of Argentina. It is the type species of Restrepophyllum.
Synonymy list
| Year | Name and author |
|---|---|
| 2010 | Restrepophyllum chiguoides Passalia et al. pp. 139, 141, 145 figs. Plate I, II and IV. Fig. 1 |
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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.
†Restrepophyllum chiguoides Passalia et al. 2010
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. G. Passalia et al. 2010 | Leaflet papyraceous, narrow, lanceolate, slightly falcate, elongate, with a length/width ratio not less than 5:1. Margins serrate with simple regularly spaced teeth. Teeth straight to slightly flexuous at base, gently concave to straight apically, with an acute apex and rounded sinus. Venation open with a prominent midvein that gradually diminishes in width towards apex. Lateral veins decurrent at an acute angle, straight to slightly curved, parallel and reaching margins without anastomizing. At margins, up to two veins per centimeter are present. Veins may remain simple before reaching margins, or they may dichotomize once at an acute angle halfway between midvein and margin. Cuticle thin, bearing stomata on epidermis on one side of the leaf (hypostomatic), presumably abaxially. Epidermal cells between veins isodiametric to elongate, with few scattered hairs. Anticlinal walls thin, straight to slightly sinuous, occasionally pitted. Periclinal walls smooth. Epidermal cells on veins rectangular, elongate, forming parallel bands. Stomata irregularly distributed and indistinctly oriented, rarely with subsidiary cells in contact. Stomatal apparatus with circular to slightly oval outline, mostly monocyclic to imperfectly dicyclic (haplocheilic) with 5–8 subsidiary cells. Suprastomatal aperture circular to oval, typically raised over epidermal surface. Guard cells sunken in an epistomatal chamber, thickened around aperture. |
Measurements
No measurements are available
No ecological data are available