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Pectinangium xuanweiense
Pectinangium xuanweiense Y. Zhou, Y. Guo, Z. Feng in Y. Zhou, Y. Guo, Pšenička, Bek, S.-L. Yang, Z. Feng Rev. Palaeobot. Palynol., 295(104500): 3. 6 Aug 2021
- Name
- Pectinangium xuanweiense
- Rank
- Species
- Generic Name
- [Genus] Pectinangium
- Authors (Name)
- Zhou Y.
Guo Y.
Feng Z.
- Authors (Pub.)
- Zhou Y.
Guo Y.
Pšenička J.
Bek J.
Yang S.-L.
Feng Z.
- Publication
- A new marattialean fern, Pectinangium xuanweiense sp. nov., from the Lopingian of Southwest China [2021/8]
- Journal
- Review of Palaeobotany and Palynology
- Volume
- 295
- Issue
- 104500
- Page number
- 3
- Year
- 2021
- Fossil Status
- foliage (fertile)
- Stratigraphy
- Lopingian
- Strat. comment
- Xuanwei Formation
- Location
- E 104°23′20″, N 25°50′31″, Qingyun, Fuyuan County, Qujing City, Yunnan Province, P.R. China
- Paleoregion
- Cathaysia (South)
Data for Holotypus
- Repository
- Institute of Palaeontology, Yunnan University, Kunming, China
- Repository Number
- YNUPB10127-1
- Diagnosis
- Fronds at least bipinnate. Ultimate pinnae suboppositely or oppositely arranged on penultimate rachises. Pinnules alternately arranged on ultimate rachises and closely spaced. Fertile and vegetative pinnules of the pecopterid type, linguiform-shaped with rounded apexes, entire bases, and parallel margins. Fertile pinnules with slightly recurved margins. Vegetative pinnules 7.5–11 mm long and approximately 2.5 mm wide, fertile pinnules 7.0–10.5 mm long and approximately 2.0 mm wide, both with distinct and straight midvein extending from the base to the apex. Lateral veins commonly bifurcate once, occasionally twice, showing the first bifurcation near the midvein. Synangia abaxially and tightly arranged in one row on
each side of the midvein. Each row has 11–17 synangia extending from the base to near the apex and covering nearly the entire lamina between the midvein and margin. Synangia sessile, rectangular to ovoidal in distal view, 0.6–0.8 mm long and 0.4–0.5 mm wide, showing four sporangia. Sporangia exannulate, perpendicular to lamina, completely fused forming a short, snout-like projection, conical to long ovoidal, 350–400 μm long, and 160–250 μm wide. Sporangial dorsal wall has at least three layers of elongated rectangular to polygonal cells. Trilete microverrucate circular to oval spores, 25–35 μm in diameter.
