Drei neue fossile Hölzer der Morphogattung Primoginkgoxylon gen. nov. aus der Trias von Kenia

Abstract

Drei permineralisierte Gymnospermenhölzer aus der Oberen Trias der Mazeras‐Formation (Duruma‐Gruppe, Mombasa‐Becken) werden beschrieben und aufgrund ihrer ginkgoalen Holzstruktur der neu errichteten Morphogattung Primoginkgoxylon gen. nov. zugeordnet (P. crystallophorum, P. muthamii, P. shimbaense). Die Kieselhölzer sind dreidimensional anatomisch erhalten und stammen aus dem fluviatil‐deltaischen Mazeras‐Sandstein, aufgeschlossen im Tal des Manolo River im Mwaluganje Community Elephant Sanctuary/Shimba‐Hills, im Südosten Kenias. Der Fundort wurde bisher nicht systematisch untersucht, erscheint jedoch sehr reich an Fossilien und verdient umfangreichere Untersuchungen wie in den Schlussbemerkungen erläutert wird. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

CONTRIBUTIONS TO THE STUDY OF THE EARLY JURASSIC PETRIFIED FOREST OF HOLBAV AND CRISTIAN AREAS (BRAȘOV REGION, SOUTH CARPATHIANS, ROMANIA), 2nd PART

“…There are several fossil stem genera described by the study of remains of fossil ginkgophyte trunks found in different Mesozoic sites in the world: Ginkgoxylon (Saporta) Süss 2003; Proginkgoxylon (Khudajberdyev) Zheng and Zhang (in Zheng et al, 2008); Szeioxylon Wang, Jiang et Qin, 1994;Sinopalaeospiroxylon Zhang et Zheng, 2006(in Zhang et al, 2006; Primoginkgoxylon Süss, Rößler, Boppré and Fischer, 2009;Palaeoginkgoxylon Feng, Wang and Rößler, 2010;and Baieroxylon Greguss, 1961 (see in Martínez and Lutz, 2007). Taking into account the observed xylotomical details of our specimens which are very similar to Palaeoginkgoxylon of Feng, Wang and Rößler (2010), we compared the description of our specimens with the diagnosis and description of Palaeoginkgoxylon, which has primary structure and pith (absent in our material), and also a welldeveloped pycnoxylic secondary xylem, with tracheids slightly irregularly arranged.…”

A unique Late Cretaceous fossil wood assemblage from Chilean Patagonia provides clues to a high‐latitude continental environment

“…However, some of these taxa are not valid (Bamford & Philippe 2001; Philippe & Bamford 2008) or included primary xylem and pith characters. Of these, only three fossil genera consisting exclusively of pycnoxylic secondary xylem can be compared with the specimen here studied: Baieroxylon Greguss, Ginkgoxylon and Primoginkgoxylon Süss et al ., 2009.…”

“…The genera Baieroxylon and Primoginkgoxylon differ from the new taxa by the presence of araucarioid to mixed‐type pits in the radial walls of the tracheids (Greguss 1961; Philippe 1993; Philippe & Bamford 2008; Süss et al . 2009). The diagnosis of Primoginkgoxylon states that ‘bordered pits on radial tracheid walls arranged abietoid’ but the plates have araucarioid to mixed‐type pits on the radial walls (Süss et al .…”

“…The diagnosis of Primoginkgoxylon states that ‘bordered pits on radial tracheid walls arranged abietoid’ but the plates have araucarioid to mixed‐type pits on the radial walls (Süss et al . 2009).…”

“…Several genera of fossil woods have been suggested to be related to Ginkgoales, including Baieroxylon Greguss, 1961, Caenoxylon Zalessky, Ginkgomyeloxylon Giraud & Hankel, 1986, Ginkgophytoxylon Vozenin‐Serra, Broutin & Toutin‐Morin, Ginkgoxylon Saporta emend. Süss, 2003 ex Philippe & Bamford, 2008, Ginkgoxylon Andreánszky, Ginkgoxylon Khudajberdyev, Palaeoginkgoxylon Feng et al ., 2010, Physematopitys Goeppert, Primoginkgoxylon Süss et al ., 2009, and Protoginkgoxylon Khudajberdyev (Zhou 2009). However, some of these taxa are not valid (Bamford & Philippe 2001; Philippe & Bamford 2008) or included primary xylem and pith characters.…”