Eotrochion polystylum Manchester, Kvaček et Judd

Plant Fossil Names Registry Number: PFN001081

Act LSID: urn:lsid:plantfossilnames.org:act:1081

Authors: S. R. Manchester, Z. Kvaček & W. S. Judd

Rank: species

Genus: Eotrochion Manchester, Kvaček et Judd

Reference: Manchester, S. R., Kvaček, Z. & Judd, W. S. (2020): Morphology, anatomy, phylogeny and distribution of fossil and extant Trochodendraceae in the Northern Hemisphere. – Botanical Journal of the Linnean Society 195(online): 467–484.

Page of description: 473

Illustrations or figures: figs 3, 4

Name is type for

Eotrochion Manchester, Kvaček et Judd 2020


Holotype UF 18131-84255, Paleobotany Collections, Florida Museum of Natural History, Gainesville, Florida, USA
Figures: figs 3A–I, 4A–D

Note: Paratypes: UF 18131–60572, 83522, 83523, housed in Florida Museum of Natural History, Gainesville, Florida, USA.

Original diagnosis/description

Infructescence a raceme bearing oblate capsular fruits with persistent styles. Fruits circular in transverse view, wide-elliptic in longitudinal view; opening by slits extending topographically above each style. Styles (nine-) 13 to 16, persistent, arising from the external margin of each carpel, about one-quarter of the distance from base to apex of the fruit. Stylar orientation variable; commonly concave with respect to the axis of symmetry of the fruit toward fruit apex, otherwise convex (recurved). Beneath each style is a circular to elliptical domed protrusion with a central depression (interpreted as nectary). Beneath the whorl of nectaries is a raised circular rim (interpreted to mark former perianth position); base of fruit and junction with pedicel smooth, without staminal scars.


Poly- (Gr = many) + stylum (Gr = column, style).


Paleogene, Paleocene
Fort Union Formation


United States
Big Sand Draw I, UF 18131 (42.8008167°N, 108.1828000°W), Wyoming

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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