Registration Stenorachis asiatica (S.Q.Zan, Axsmith, N.C.Fraser, F.X.Liu et D.H.Xing) H.M.Anderson in Anderson, Barbacka, Bamford, Holmes & Anderson

Plant Fossil Names Registry Number: PFN000176

Act LSID: urn:lsid:plantfossilnames.org:act:176

Rank: species

Basionym: Umkomasia asiatica S.Q.Zan, Axsmith, N.C.Fraser, F.X.Liu et D.H.Xing

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Reference: Anderson, H. M., Barbacka, M., Bamford, M. K., Holmes, W.B. K. & Anderson, J. M. (2019): Umkomasia (megasporophyll); Part 1 of a reassessment of Gondwana Triassic plant genera and a reclassification of those incorrectly attributed. – Alcheringa: An Australasian Journal of Palaeontology 43(1): 1–28.

Types

Holotype P1500, The Geological Museum of China, Beijing, China
Figures: pl. 1, fig. 1

Note: Paratypes: P1501 (pl. I, fig. 2), P 1502 (pl. I, figs 3, 5), P1503 (pl. I, fig. 4).

Original diagnosis/description

Cupulate organ with main axis at least 6.5 cm long and ~ 2 mm wide; lateral axes arranged on main axis in lax spiral, each lateral axis with one to at least three pairs of oppositely arranged cupules born on narrow stalks; individual cupules strongly recurved, unlobed, small, ovoid, up to ~ 2× longer than wide.

Etymology

The specific epithet asiatica refers to the status of this fossil as the first reported occurrence of Umkomasia from Asia.

Stratigraphy

Triassic, Upper Triassic
Siltstone layers of the Yangcaogou Formation, Upper Triassic

Locality

China
Yangcaogou Community, Zhaomagou Village, approximately 15 km northeast of Yixian in Liaoning Province, NE China.

Plant fossil remain

macro- and meso-fossils-embryophytes except wood

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