Equicalastrobus glabratus Rodríguez, Bodnar et M.Beltrán

Plant Fossil Names Registry Number: PFN003302

Act LSID: urn:lsid:plantfossilnames.org:act:3302

Authors: J. N. P. Rodríguez, J. Bodnar & M. Beltrán

Rank: species

Genus: Equicalastrobus Grauvogel-Stamm et Ash

Reference for this name: Rodríguez, J. N. P., Bodnar, J. & Beltrán, M. (2024): A new species of the equisetalean plant Equicalastrobus from the Middle Triassic of Argentina. – Acta Palaeontologica Polonica 69(2): 303–313.

Page of description: 307

Illustrations or figures: figs 2–4

Types

Original diagnosis/description

Cylindrical strobili formed by a main axis on which sporangiophores are arranged in whorls. Sporangiophores consist of hexagonal peltate discs without trichomes (= glabrous). Central umbo, hexagonal, slightly elevated on the external surface of the disc. From the umbo emerges a leaf-shaped projection, with longitudinal striations, ending in a sharp tip directed towards the apex of the strobilus. Base of the strobilus with a leaf sheath protecting it. Branched axes with marked longitudinal ribs, continuous through the node. Robust first-order axes. Thinner second-order axes emerging from the nodes of the first-order axes and bearing leaf-sheaths composed of reduced leaves, fused at the base and free at the apex.

Etymology

The specific epithet refers to the absence of trichomes on the margins of the sporangiophore discs.

Stratigraphy

Triassic, Middle Triassic, Ladinian
EF4, Don Raúl Member, Cortaderita Formation, Sorocayense Group; Ladinian, Middle Triassic

Locality

Argentina
Un Salto Creek, Barreal, San Juan Province, Argentina