Nilssoniopteris

Nilssoniopteris; Temporal range: Kungurian–Lower Cretaceous PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Order:	†Bennettitales
Family:	†Williamsoniaceae
Genus:	†Nilssoniopteris; Nathorst, 1909
Type species
	†Nilssoniopteris tenuinervis; (Nathorst, 1880)
Synonyms
	Taeniozamites Harris, 1932

Nilssoniopteris is an extinct form genus of leaves belonging to the Bennettitales. Leaves are slender and often entire-margined (smooth-edged), though some species have dissected leaves with numerous small segments extending down to the rachis of the leaf.^[1]^[2] Nilssoniopteris-like leaves are distinguished by their syndetocheilic stomata, indicating bennettitalean affinities. Similar "taeniopterid" leaves are placed in the genus Nilssonia if their stomata are instead haplocheilic (indicating cycad affinities), or if the cuticle is not preserved.^[3]

References[]

^ Pott, Christian; Krings, Michael; Kerp, Hans (2007). "First Record of Nilssoniopteris (Gymnospermophyta, Bennettitales) from the Carnian (upper Triassic) of Lunz, Lower Austria". Palaeontology. 50 (5): 1299–1318. doi:10.1111/j.1475-4983.2007.00704.x. ISSN 1475-4983.
^ Cleal, Christopher J.; Rees, P. McAllister; Zijlstra, Gea; Cantrill, David J. (2006). "A clarification of the type of Nilssoniopteris Nathorst (fossil Gymnospermophyta, Bennettitales)". Taxon. 55 (1): 219–222. doi:10.2307/25065546. hdl:1874/307500. ISSN 1996-8175. JSTOR 25065546.
^ van Konijnenburg-van Cittert, Johanna H. A.; Pott, Christian; Cleal, Christopher J.; Zijlstra, Gea (2017-02-01). "Differentiation of the fossil leaves assigned to Taeniopteris, Nilssoniopteris and Nilssonia with a comparison to similar genera". Review of Palaeobotany and Palynology. 237: 100–106. doi:10.1016/j.revpalbo.2016.11.009. ISSN 0034-6667.

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[1] Pott, Christian; Krings, Michael; Kerp, Hans (2007). "First Record of Nilssoniopteris (Gymnospermophyta, Bennettitales) from the Carnian (upper Triassic) of Lunz, Lower Austria". Palaeontology. 50 (5): 1299–1318. doi:10.1111/j.1475-4983.2007.00704.x. ISSN 1475-4983.

[2] Cleal, Christopher J.; Rees, P. McAllister; Zijlstra, Gea; Cantrill, David J. (2006). "A clarification of the type of Nilssoniopteris Nathorst (fossil Gymnospermophyta, Bennettitales)". Taxon. 55 (1): 219–222. doi:10.2307/25065546. hdl:1874/307500. ISSN 1996-8175. JSTOR 25065546.

[3] van Konijnenburg-van Cittert, Johanna H. A.; Pott, Christian; Cleal, Christopher J.; Zijlstra, Gea (2017-02-01). "Differentiation of the fossil leaves assigned to Taeniopteris, Nilssoniopteris and Nilssonia with a comparison to similar genera". Review of Palaeobotany and Palynology. 237: 100–106. doi:10.1016/j.revpalbo.2016.11.009. ISSN 0034-6667.

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