Reappraisal of the ill-defined Liassic pteridosperm Dichopteris using an ultrastructural approach
type: Dataset
description: This review of the genus Dichopteris De Zigno is based on the original fossil specimens collected from the Lower Jurassic of the Grey Limestones of Veneto (Northern Italy). The cuticular diagnosis of the genus is emended and only Dichopteris visianica De Zigno is retained within the genus. In addition, transverse and longitudinal sections of cuticles examined using a transmission electron microscope (TEM) indicate close similarities between D. visianica and other pteridosperm cuticles, especially the occurrence of granules arranged in areas of different densities in the epidermal cells and stomatal apparatus. Moreover, the dichotomy and the impressive size of the frond of D. visianica imply a specific architecture with a typical arrangement of the pinnae and pinnules. They preclude an herbaceous habit for the plant. Finally, architectural, microstructural and ultrastructural observations are consistent with palaeoclimatic and palaeoenvironmental data, and most probably support an understorey habit for D. visianica.
issued: 2026-05-10T02:13:58.498198
language: en
modified: 2026-05-10T02:13:58.498202
contact point: Organization
  fn: CCSD
keyword: architecture
keyword: cuticle
keyword: early-jurassic
keyword: infoeu-reposemanticsarticle
keyword: journal-articles
keyword: palaeobotany
keyword: sdustupgsciences-of-the-universe-physicsearth-sciencespaleontology
keyword: sem
keyword: taxonomy
keyword: tem
landing page: 0024-4074

Reappraisal of the ill-defined Liassic pteridosperm Dichopteris using an ultrastructural approach
type: Distribution
format: HTML
issued: 2026-05-10T02:13:58.511154
modified: 2026-05-10T02:13:58.487772
access URL: https://hal.science/hal-00085214

test_moissonnage_selune
type: Agent