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Ctenis clarnoensis
Ctenis clarnoensis Erdei, Manchester Int. J. Pl. Sci., 2015, 176(1): 35. 24 Nov 2014
- Name
- Ctenis clarnoensis
- Rank
- Species
- Generic Name
- [Genus] Ctenis
- Authors (Pub.)
- Erdei B.
Manchester S. R.
- Publication
- Ctenis clarnoensis sp. n., an unusual cycadalean foliage from the Eocene Clarno Formation, Oregon [2014/11]
- Journal
- International Journal of Plant Sciences
- Annee/Jahrgang
- 2015
- Volume
- 176
- Issue
- 1
- Page number
- 35
- Year
- 2014
- Fossil Status
- foliage
- Stratigraphy
- Eocene
- Strat. comment
- Clarno Formation
- Location
- Hancock Canyon, Wheeler County, Oregon, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- Museum of Paleontology, University of California, Berkeley, USA
- Repository Number
- UCMP 151989
Data for Paratypus
- Repository
- Florida Museum of Natural History, Gainesville, USA
- Repository Number
- UF 225-47241, 47243, OMSI-PB 492, 1754a,
1754b (fig. 2A, 2B, 2E–2G; loose cuticle fragments have been
preserved and analyzed), OMSI-PB 1715 (and cuticle slides
prepared from OMSI-PB 1715; fig. 2C, 2D)
- Diagnosis
- Leaf pinnately compound; pinnae at least six
pairs, inserted with broad, slightly contracted base laterally
and suboppositely on rachis sides at angles of 807–857 to rachis.
Pinnae falcate, robust, elliptic, margin entire, partly involute; basiscopic pinna base decurrent to rachis; apex obtuse
with an acuminate tubular tip. Veins frequently forking and
anastomosing to form a network. Veins decurrent at pinna
base; adjacent veins joining before reaching the margin or the
apex. Ordinary epidermal cells on adaxial and abaxial sides
isodiametric, anticlinal cell walls thickened, slightly undulate.
Leaf hypostomatic, stomata scattered, randomly orientated,
cyclocytic, guard cells sunken; subsidiary cell walls thickened,
forming a rim around guard cells.
