Zamuneria amyla

Name

Zamuneria amyla

Rank

Species

Generic Name

[Genus] Zamuneria

Authors (Name)

Martínez L. C. A. Iglesias A. Artabe A. E.  

Authors (Pub.)

Martínez L. C. A. Iglesias A. Artabe A. E. Varela A. N. Apesteguía S.  

Publication

A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina [2016/12]

Journal

Cretaceous Research

Annee/Jahrgang

2017

Volume

72

Issue

10.1016/j.cretres.2016.12.008

Page number

84

Year

2016

Fossil Status

stems

Stratigraphy

Cenomanian

Strat. comment

Mata Amarilla Formation

Location

Cerro Fortaleza, Santa Cruz Province, Argentina

Paleoregion

America (South)

Data for Holotypus

Repository

Museo Regional Provincial Padre Manuel Jesús Molina, Santa Cruz, Argentina

Repository Number

MPM-Pb-17527

Num

fig. 3

Pub.

A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina [2016/12]

Data for Isotypus

Repository

Museo de La Plata, La Plata, Argentina

Repository Number

LPPB-14021, pmLPPB-1938 to pmLPPB-1949

Num

fig. 4-11

Pub.

A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina [2016/12]

Diagnosis

A columnar and polyxylic stem, covered by persistent rhomboidal leaf bases and cataphylls. A wide and parenchymatous central pith with mucilage canals, idioblasts and medullary vascular bundles. The vascular system comprises a medullary vascular system, and a cylindrical vascular system. The medullary vascular system is composed of many scattered medullary vascular bundles. The cylindrical vascular system has concentric rings of centrifugal secondary xylem and phloem (polyxylic) toward the cortex, separated by wide multiseriate parenchymatic rays (primary rays). Primary rays with vascular bundles and mucilage canals. Tracheids of secondary xylem with uni- to triseriate contiguous and alternate bordered pits in walls. Manoxylic secondary xylem and phloem with homocellular multiseriate rays, with one to three cells wide (secondary rays). Cortex composed of fundamental parenchyma cells and idioblasts, mucilage canals and girdling leaf traces.