Back
Yanliaoa sinensis
Yanliaoa sinensis 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 sinensis
- Rank
- Species
- Generic 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
- Fossil Status
- leafy twigs
- Stratigraphy
- Middle Jurassic
- Strat. comment
- Haifanggou Formation
- Location
- Sanjiaochengzi Village, Huludao City, Liaoning Province, China
- Paleoregion
- Eurasia (China)
Data for Holotypus
- Repository
- Research Center of Palaeontology and Stratigraphy, Jilin University, Changchun, China
- Repository Number
- RCPS-SJS003-1
Data for Syntypus
- Repository Number
- L006A, L0040A, L0027, and L0034A [personal collection of Pan, presumably lost]
Data for Paratypus
- Repository
- Research Center of Palaeontology and Stratigraphy, Jilin University, Changchun, China
- Repository Number
- RCPS-SJS093
- Diagnosis
- Leafy twigs may have up to three orders of branching. Ultimate branches oriented in one plane, alternately (sometimes sub-oppositely) arranged on penultimate axis. Leaf bases appearing to be organized helically but leaves orientated in one plane. Most mature leaves straight or slightly falcate, with entire margin and rounded apex, 6–12 mm long,1–1.5 mm wide, and the length-width ratio usually higher than5. Midrib prominent, sunken on adaxial side and raised on the abaxial side. Leaves attached broadly to axis at their bases, each leaf extending outward at angles of 25–40◦. Immature leaves and leaves on branches bearing ovulate cones notably smaller and appressed to the axis, with a lower length-width ratio. Ovulate cones elliptical, 12–15 mm long, 8–12 mm wide. The scales of the immature ovulate cones inserted at an acute angle to the axis and those of the 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.
