Biology:Sommerxylon
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Short description: Extinct genus of conifers
| Sommerxylon | |
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Gymnospermae |
| Division: | Pinophyta |
| Class: | Pinopsida |
| Order: | Cupressales |
| Family: | Taxaceae |
| Genus: | †Sommerxylon Pires & Guerra-Sommer |
| Species | |
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Sommerxylon is a genus described from petrified trunks of Gymnosperms that lived in the Triassic, found in the Caturrita Formation on Linha São Luiz in the municipality of Faxinal do Soturno in the region of Paleorrota. It is named in honor of Dr. Margot Guerra Sommer.[1]
Description
Pith composed of parenchyma cells and sclerenchyma cells, primary xylem is endarch, secondary xylem with points with halos that dominate, thick radial walls of tracheids, absence of resin canals and axial parenchyma, which lead to some authors suggesting a close relationship to the family Taxaceae.[1] However, other authors have considered their affinities to the family equivocal.[2]
References
- ↑ 1.0 1.1 Sommerxylon spiralosus from Upper Triassic in southernmost Paraná Basin (Brazil)
- ↑ Philippe, Marc; Afonin, Maxim; Delzon, Sylvain; Jordan, Gregory J.; Terada, Kazuo; Thiébaut, Mélanie (April 2019). "A paleobiogeographical scenario for the Taxaceae based on a revised fossil wood record and embolism resistance" (in en). Review of Palaeobotany and Palynology 263: 147–158. doi:10.1016/j.revpalbo.2019.01.003. https://linkinghub.elsevier.com/retrieve/pii/S0034666718302446.
- Kaokoxylon zalesskyi (Sahni) Maheshwari en los niveles superiores de la Secuencia Santa Maria
- O complexo Dadoxylon-Araucarioxylon, Carbonífero e Permiano
- Técnica de coleta e estabilização de fósseis em pelitos laminados, aplicação em níveis com plantas do Triássico Superior
Wikidata ☰ Q7560471 entry
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