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Yanliaoa
Genus Yanliaoa K. Pan ex X. Tan, Dilcher, H.-S. Wang, Ying Zhang, Y.-L. Na, T. Li, Y.-F. Li, C.-L. Sun Palaeoworld, 27(3): 361. 23 Mar 2018
- Name
- Yanliaoa
- Rank
- Genus
- Replaced Name
- [Genus] Yanliaoa
- Authors (Name)
- Pan K.
- Authors (Pub.)
- Tan X.
Dilcher D. L.
Wang H.-S.
Zhang Y.
Na Y.-L.
Li T.
Li Y.-F.
Sun C.-L.
- Publication
- Yanliaoa, an extinct genus of Cupressaceae s. l. from the Middle Jurassic, northeastern China [2018/3]
- Journal
- Palaeoworld
- Volume
- 27
- Issue
- 3
- Page number
- 361
- Year
- 2018
- Parent Taxon
- [Subclass] Cupressidae
- Fossil Status
- leafy twigs
- Type
- Yanliaoa sinensis
- Diagnosis
- Leafy twigs may have up to three orders of branching. Ultimate branches oriented in one plane, alternately (sometimes suboppositely) arranged on penultimate axes. Leaf bases helically arranged on axis but leaves orientatedin one plane. Leaf straight or slightly falcate, broadly attached to axis; margin entire, apex rounded. Midrib prominent, sunkenon adaxial side and raised on the abaxial side.Leaf hypostomatic. Lower cuticle containing a stomatal zoneon each side of the midvein. Each stomatal zone consisting of three to four rows of stomata; guard cells normally surrounded by four to six subsidiary cells. Ovulate cone elliptical. Scales of immature ovulate cones inserted at an acute angle to the axis and those of mature ovulate cones inserted at an obtuse angle, both with spine-like distal end; two seed scars present at the proximal portion of the adaxial surface of the scale.
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