Iratinia Spiekermann, Jasper, Siegloch, Guerra-Sommer et D.Uhl

Plant Fossil Names Registry Number: PFN002675


Authors: R. Spiekermann, A. Jasper, A. M. Siegloch, M. Guerra-Sommer & D. Uhl

Rank: genus

Reference: Spiekermann, R., Jasper, A., Siegloch, A. M., Guerra-Sommer, M. & Uhl, D. (2021): Not a lycopsid but a cycad-like plant: Iratinia australis gen. nov. et sp. nov. from the Irati Formation, Kungurian of the Paraná Basin, Brazil. – Review of Palaeobotany and Palynology 289: 104415 (14 pp.).

Page of description: 4


Iratinia australis Spiekermann, Jasper, Siegloch, Guerra-Sommer et D.Uhl

Original diagnosis/description

Monoxylic and manoxylic axis covered by an armour of helically arranged rhomboidal leaf bases. Large pith and narrow centrifugal xylem ring. Primary xylem arranged in numerous strands distributed around the pith. Secondary xylem well-developed and relatively dense. Tracheids of the secondary xylem with araucarioid pitting. Phloem well-developed with abundant fibres. Radial system composed of numerous medullary and secondary rays. Rays parenchymatous and uni- to multiseriate. Wide medullary rays with vascular bundles. Leaf traces forming a girdling meshwork in the cortex before entering leaf bases. Cortex parenchymatous with mucilage cavities.


After the Irati Formation, from which the type material has been discovered.

Plant fossil remain

macro- and meso-fossils-embryophytes except wood

Names associated with genus

Iratinia australis Spiekermann, Jasper, Siegloch, Guerra-Sommer et D.Uhl 2021


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