Sommerxylon

Sommerxylon; Temporal range: 228–199.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Gymnospermae
Division:	Pinophyta
Class:	Pinopsida
Order:	Cupressales
Family:	Taxaceae
Genus:	†Sommerxylon; Pires & Guerra-Sommer
Species
	Sommerxylon spiralosus;

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

^ ^a ^b 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". Review of Palaeobotany and Palynology. 263: 147–158. Bibcode:2019RPaPa.263..147P. doi:10.1016/j.revpalbo.2019.01.003.

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[:0-1] Sommerxylon spiralosus from Upper Triassic in southernmost Paraná Basin (Brazil)

[2] 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". Review of Palaeobotany and Palynology. 263: 147–158. Bibcode:2019RPaPa.263..147P. doi:10.1016/j.revpalbo.2019.01.003.

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