The INTERNATIONAL FOSSIL PLANT NAMES INDEX
Global registry of scientific names of fossil organisms covered by the International Code of Nomenclature for Algae, Fungi, and Plants and the International Code of Zoological Nomenclature © 2014-2024

IDNAME urn:idName:ifpni.org:species:A7A96817-D433-AB32-99A0-49284810B1AE species
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Wintucycas stevensonii

Wintucycas stevensonii L.C.A. Martínez, Artabe, Bodnar Bot. J. Linn. Soc., 170(3): 438. 19 Oct 2012
Name
Wintucycas stevensonii
Rank
Species
Generic Name
[Genus] Wintucycas
Authors (Pub.)
Martínez L. C. A. Artabe A. E. Bodnar J.  
Publication
A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales [2012/10]
Journal
Botanical Journal of the Linnean Society
Volume
170
Issue
3
Page number
438
Year
2012
Fossil Status
stems
Stratigraphy
Upper Cretaceous
Strat. comment
Allen Formation
Location
Salitral Ojo de Agua, Río Negro province, Patagonia, Argentina
Paleoregion
America (South)
Data for Holotypus
Repository
Universidad Nacional del Comahue (MUCPb), Paleontological Collection, Neuquén, Argentina
Repository Number
MUCPb-369
Data for Isotypus
Repository
Museo de La Plata, La Plata, Argentina
Repository Number
LPPB-13876, pmLPPB-1604 to pmLPPB-1608
Data for Paratypus
Repository
Universidad Nacional del Comahue (MUCPb), Paleontological Collection, Neuquén, Argentina
Repository Number
MUCPb-370, MUCPb-371 and MUCPb-372
Diagnosis
A columnar and polyxylic stem, covered by persistent rhomboidal leaf bases. A wide and parenchymatous central pith with mucilage canals, idioblasts and medullary vascular bundles. The secondary vascular cylinder comprises a medullary vascular system and a cylindrical vascular system. The medullary vascular system is composed of many medullary vascular bundles. The cylindrical vascular system has concentric rings of secondary xylem and phloem toward the cortex, and centripetal bundles adjacent to the innermost ring. Manoxylic secondary xylem, with homocellular, multiseriate rays one to four cells wide. Secondary phloem with parenchyma cells and abundant mucilage canals. Cortex composed of parenchyma cells and idioblasts, mucilage canals and girdling leaf traces. Foliar traces with an elaborated omega pattern. Leaf bases with simple and unbranched trichomes on the adaxial side.
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