Distinctive quadrangular seed-bearing structures of gnetalean affinity from the Late Jurassic Morrison Formation of Utah, USA

Manchester Steven R.; Zhang Xiaoqing; Hotton Carol L.Wing Scott L.Crane Peter R.

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Distinctive quadrangular seed-bearing structures of gnetalean affinity from the Late Jurassic Morrison Formation of Utah, USA

机译：Distinctive quadrangular seed-bearing structures of gnetalean affinity from the Late Jurassic Morrison Formation of Utah, USA

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A new kind of seed-bearing structure is described based on three-dimensional casts and partially permineralized small cones from the Upper Jurassic Brushy Basin Member of the Morrison Formation, in the Henry Mountains of Utah. Cones of Dayvaultia tetragona gen. et sp. nov. are obovate in lateral view, 10.0-11.0 mm long, square in cross-section and 5.1-8.0 mm wide, with a thick wall composed of four tightly adhering bracts that open apically to expose the tips of six or eight elongate, four-lobed seeds. Micro-CT scanning reveals that the seeds are borne on a cup-shaped receptacle in a regular opposite and decussate manner. This regular arrangement, as well as similarities of the seeds to several kinds of Early Cretaceous chlamydospermous seeds, including those of Lobospermum and Battenispermum, suggests a relationship to extant and Cretaceous members of Gnetales. The sedimentary context in which the cones occur, combined with their local abundance, suggests that Dayvaultia was common on intermittently inundated well-drained floodplains during Morrison times, enhancing insight into the vegetation that supported the diverse vertebrate faunas for which the Morrison Formation is well known.

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《Journal of Systematic Palaeontology》 |2021年第12期|743-760|共18页
作者
Manchester Steven R.; Zhang Xiaoqing; Hotton Carol L.Wing Scott L.Crane Peter R.;
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Florida Museum Nat Hist, Dickinson Hall,1659 Museum Rd, Gainesville, FL 32611 USA;

Florida Museum Nat Hist, Dickinson Hall,1659 Museum Rd, Gainesville, FL 32611 USA|Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Jiangsu, Peoples R China|Univ Sci & Technol China, Hefei 230026, Anhui, People;

Smithsonian Inst, Dept Paleobiol, Natl Museum Nat Hist, NHB 121, Washington, DC 20560 USAYale Univ, Yale Sch Environm, 195 Prospect St, New Haven, CT 06511 USAYale Univ, Yale Sch Environm, 195 Prospect St, New Haven, CT 06511 USA|Oak Spring Garden Fdn, 1776 Loughborough Lane, Upperville, VA 20184 USA;

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Chlamydosperms; Gnetales; cones; palaeobotany; mu-CT scanning;

Distinctive quadrangular seed-bearing structures of gnetalean affinity from the Late Jurassic Morrison Formation of Utah, USA

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