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Menispermites parvareolatus
Menispermites parvareolatus L.J. Hickey Mem. Geol. Soc. Amer., 150: 126. 19 Jul 1977
- Name
- Menispermites parvareolatus
- Rank
- Species
- Generic Name
- [Genus] Menispermites
- Authors (Pub.)
- Hickey L. J.
- Publication
- Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of Western North Dakota [1977/7]
- Journal
- Memoirs of the Geological Society of America
- Volume
- 150
- Page number
- 126
- Year
- 1977
- Fossil Status
- leaves
- Stratigraphy
- Thanetian
- Location
- North of Gladstone, Stark County, North Dakota, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- USNM 43238
- Diagnosis
- Leaf very wide ovate; l/w ratio 0.8; I 3.2 cm; w 5.1 cm; apex rounded
and emarginate; base obtuse; margin cut into shallow lobes that show no sign of a glandular tip; petiole thin, at least 1 cm long; texture subcoriaceous. Venation perfect acrodromous with three strong primary veins from the base and a weak pair of secondaries outside these; primaries branching and somewhat irregular in course, central one terminating at the apex where the remains of a mucro may be present; secondaries of various sizes, angle of origin moderate to wide acute; secondaries and their branches looping near the margin, not reaching the apices of the lateral teeth but dividing just before doing so. Tertiaries originating at high acute angles, moderate in size, ramified; rank of highest order venation, sixth; highest order showing excurrent branching, fourth; marginal ultimate venation characterized by a
distinctive set of progressively higher order vein loops giving rise to a well-developed fimbrial vein; areoles small (0.3 mm), equant and irregular, and without freely ending veinlets.
