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Dayvaultia
Genus Dayvaultia Manchester, P.R. Crane in Manchester, X.-Q. Zhang, Hotton, S.L. Wing, P.R. Crane J. Syst. Palaeontol., 19(10): 744. 15 Oct 2021
- Name
- Dayvaultia
- Rank
- Genus
- Authors (Name)
- Manchester S. R.
Crane P. R.
- Authors (Pub.)
- Manchester S. R.
Zhang X.-Q.
Hotton C. L.
Wing S. L.
Crane P. R.
- Publication
- Distinctive quadrangular seed-bearing structures of gnetalean affinity from the Late Jurassic Morrison Formation of Utah, USA [2021/10]
- Journal
- Journal of Systematic Palaeontology
- Volume
- 19
- Issue
- 10
- Page number
- 744
- Year
- 2021
- Parent Taxon
- [Class] Gnetopsida
- Fossil Status
- reproductive organs (seed)
- Type
- Dayvaultia tetragona
- Diagnosis
- Seed-bearing structures are small compound cones, obovate in lateral view and square to slightly oblong in cross-section with four smooth faces and four sharp edges. Length/width ratio 1.4:1 to 2:1. Apex rounded to truncate, with each of the four faces apically rounded; tapering smoothly below to an acute base lacking a peduncle. Cones open apically comprised of twopairs of thick, opposite and decussately arranged bracts arranged around a central cup-shaped receptacle. The receptacle occupies the lower half of the cone and bears six to eight seeds arranged in pairs and embedded in its upper surface in a regular opposite and decussate manner. Seeds erect, orthotropous, about twice as long aswide, narrowly ovate with a pointed apex, radially symmetrical, prominently four-lobed in apical view and transverse section.
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