Menispermites calderensis Jud, Gandolfo, A.Iglesias et Wilf in Jud, Iglesias, Wilf & Gandolfo

Plant Fossil Names Registry Number: PFN002659

Act LSID: urn:lsid:plantfossilnames.org:act:2659

Authors: N. A. Jud, M. A. Gandolfo, A. Iglesias & P. Wilf

Rank: species

Reference: Jud, N. A., Iglesias, A., Wilf, P. & Gandolfo, M. A. (2018): Fossil moonseeds from the Paleogene of West Gondwana (Patagonia, Argentina). – American Journal of Botany 105(5): 927–942.

Page of description: 932

Illustrations or figures: fig. 5A–C

Types

Original diagnosis/description

Leaf simple, petiolate; blade attachment subpeltate; blade ovate, nearly symmetrical; base broadly rounded, cordate, base angle reflexed; apex acute, retuse; margin entire. Primary venation suprabasal actinodromous, basal veins departing from the petiole insertion point; central primary slightly wider than lateral primaries; first pair of lateral primaries arching laterally and about one-quarter the distance to apex, second pair extending about two-thirds the distance to apex into apical half of lamina; secondary vein framework brochidodromous, secondary veins excurrent, ascending from the central primary with the lowermost pair diverging near the middle of the blade, central secondary veins alternate or subopposite, simple to compound agrophic veins; tertiary vein framework mixed alternate/opposite percurrent; fourth and fifth vein order framework regular polygonal reticulate; areoles regular, polygonal; fimbrial vein conspicuous.

Etymology

The specific epithet “calderensis” means “of the caldera,” referring to the caldera-lake depositional setting of the Tufolitas Laguna del Hunco (Aragón and Mazzoni, 1997).

Stratigraphy

Paleogene, Eocene, Ypresian
Tufolitas Laguna del Hunco, Huitrera Formation, Middle Río Chubut Volcanic-Pyroclastic Complex

Locality

Argentina
LHF 0038 float sample, Chubut Province