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Palaeosinomenium ornamentum
Palaeosinomenium ornamentum M.E. Collinson, Manchester, V. Wilde Abh. Senckenberg. Naturf. Ges., 570: 41. 29 Jun 2012
- Name
- Palaeosinomenium ornamentum
- Rank
- Species
- Generic Name
- [Genus] Palaeosinomenium
- Authors (Pub.)
- Collinson M. E.
Manchester S. R.
Wilde V.
- Publication
- Fossil fruits and seeds of the Middle Eocene Messel biota, Germany [2012/6]
- Journal
- Abhandlungen [herausgegeben von] der Senckenbergischen Naturforschenden Gesellschaft
- Volume
- 570
- Page number
- 41
- Year
- 2012
- Parent Taxon
- [Genus] Palaeosinomenium
- Fossil Status
- fruits (endocarps)
- Stratigraphy
- Lutetian
- Location
- Messel, Landkreis Darmstadt-Dieburg, Hesse, Germany
- Paleoregion
- Eurasia (Europe)
Data for Holotypus
- Repository
- Senckenberg Naturhistorische Sammlungen Frankfurt, Senckenberg Forschungsinstitut und Naturmuseum, Frankfurt am Main, Germany
- Repository Number
- SM.B Me 7343
- Diagnosis
- Endocarp bisymmetric, dorsiventral length 4.5–6.0 mm, width 5.7–6.6 mm (n = 3), laterally flattened, reniform in lateral view with broad rounded dorsal surface, with a dorsal crest (“keel”; equals marginal flange sensu Chandler 1961b) running around the plane of bisymmetry, base concave to convex but mostly almost straight. Smooth central condylar depression almost subcircular to obovate, asymmetrical and more or less flat. Central area has a distinctive elongate foramen close to the basal (ventral) side (foramen about a quarter of the dorsiventral length of the endocarp). Central area sometimes raised around the foramen. Central area surrounded by a slightly asymmetric horseshoe- to Cshaped lateral crest, on the top of which there is always a narrow groove. To the inside of the lateral crest there are inconspicuous nodules in a single row in some specimens, apparently absent in others. To the outside of the lateral crest is a row of about 15–20 radially elongate ridges (sometimes club-shaped, sometimes branching) extending slightly more than half the distance between the crest and the periphery of the endocarp. Between these ribs and the periphery the endocarp is ornamented with closely spaced radially elongated finer ribs giving it a striated appearance (rarely they may be absent, rarely more strongly developed as ridges opposite ribs.
