Mesosingeria

Mesosingeria; Temporal range:
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Gymnosperms
Division:	Cycadophyta
Class:	Cycadopsida
Order:	Cycadales
Genus:	Mesosingeria; S.Archang.[1]
Species
	M. coriacea (type species); M. herbstii; M. mucronata; M. obtusa; M. oblonga; M. parva; M. striata;

Mesosingeria is a genus of fossil foliage attributable to the Cycadales. This genus is found in Early Cretaceous rocks from Argentina.

Taxonomy

The genus was erected by Sergio Archangelsky based on material from the Anfiteratro de Ticó Formation in Argentina to include two species, namely M.coriacea and M. herbstii.[1] The name of the genus is dedicated to the mycologist Rolf Singer. Other five species were later added to the genus from the same localities.[2][3][4]

Description

The genus includes foliage fossils of bipinnate leaves with a flat rachis. The pinnules are oblong to lanceolate, alternate, with one or more veins entering each pinnule, then dichotomizing and continuing straight to the apex. The cuticle presents monocyclic stomata which are usually sunken in a stomatal pit constricted by a ring of cuticle on the outside.

References

Archangelsky, Sergio (1963). "A new Mesozoic flora from Ticó, Santa Cruz Province, Argentina". Bulletin of the British Museum (Natural History), Geology. 8 (2): 45–62. doi:10.5962/p.313876.
Archangelsky, Sergio (1963). "NOTAS SOBRE LA FLORA FOSIL DE LA ZONA DE TICO, PROVINCIA DE SANTA CRUZ. 2. Tres nuevas especies de Mesosingeria". Ameghiniana (in Spanish). 3 (4): 113–122. ISSN 1851-8044.
Villar De Seoane, Liliana (2005-08-01). "New cycadalean leaves from the Anfiteatro de Ticó Formation, Early Aptian, Patagonia, Argentina". Cretaceous Research. 26 (4): 540–550. doi:10.1016/j.cretres.2005.02.004. ISSN 0195-6671.
Villar de Seoane, L. (1997). "Estudio cuticular comparado de nuevas Cycadales de la Formación Baqueró (Cretácico Inferior), provincia de Santa Cruz, Argentina" (PDF). Revista Española de Paleontología. 12: 129–140.

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[:0-1] Archangelsky, Sergio (1963). "A new Mesozoic flora from Ticó, Santa Cruz Province, Argentina". Bulletin of the British Museum (Natural History), Geology. 8 (2): 45–62. doi:10.5962/p.313876.

[2] Archangelsky, Sergio (1963). "NOTAS SOBRE LA FLORA FOSIL DE LA ZONA DE TICO, PROVINCIA DE SANTA CRUZ. 2. Tres nuevas especies de Mesosingeria". Ameghiniana (in Spanish). 3 (4): 113–122. ISSN 1851-8044.

[3] Villar De Seoane, Liliana (2005-08-01). "New cycadalean leaves from the Anfiteatro de Ticó Formation, Early Aptian, Patagonia, Argentina". Cretaceous Research. 26 (4): 540–550. doi:10.1016/j.cretres.2005.02.004. ISSN 0195-6671.

[4] Villar de Seoane, L. (1997). "Estudio cuticular comparado de nuevas Cycadales de la Formación Baqueró (Cretácico Inferior), provincia de Santa Cruz, Argentina" (PDF). Revista Española de Paleontología. 12: 129–140.