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

Plant Fossil Names Registry Number: PFN002676


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

Rank: species

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

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

Illustrations or figures: pls I–VI

Name is type for

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


Holotype MCT1487-PB, Museu de Ciências da Terra, Serviço Geológico do Brasil (CPRM), Rio de Janeiro, Brazil
Figures: pls I–VI

Note: Slides of holotype are numbered: MCT1487-PB-1, MCT1487-PB-2, MCT1487-PB-3, MCT1487-PB-4, MCT1487-PB-5.

Original diagnosis/description

Numerous lateral outgrowth scars inserted among the leaf bases and distributed along the axis in an apparent but not welldefined helical arrangement. Central pith with parenchymatous cells and idioblasts bearing dark content. Xylem ring centrifugal and narrow. Secondary xylem well-developed and relatively dense, with tracheids bearing 1–2 seriate araucarioid pitting and helical thickenings. Phloem broader than xylem, composed of abundant thick-walled fibres grouped in nests, and smaller and thinner-walled cells. Radial system with numerous medullary and secondary rays. Cortex relatively narrow.


Specific epithet referring to the southern provenance of the specimen.


Permian, Cisuralian, Kungurian
Irati Formation, Kungurian, Cisuralian


District of Assistência, municipality of Rio Claro, São Paulo State

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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