Geinitzia sp.
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publication ID |
https://doi.org/ 10.5252/g2017n4a5th |
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publication LSID |
urn:lsid:zoobank.org:pub:2832B914-8464-460F-B3F4-5BB9EA01D513 |
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persistent identifier |
https://treatment.plazi.org/id/03C187A2-FFFA-475C-792D-FEC5FE3CFB41 |
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treatment provided by |
Marcus |
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scientific name |
Geinitzia sp. |
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( Fig. 3A, B View FIG )
MATERIAL. — 1 specimen: IGR 2769b.
DESCRIPTION
Leafy axes straight, up to 85 mm long, and up to 14 mm wide. Branches arise at up to45°.Leaves are helically arranged,elongated, triangular in sagittal view, and show a long free part. The angle between the leaves and the main axis of the shoot is up to 60°. The leaves are up to 9 mm long, and up to 3 mm thick. The leaf margin is entire. The apex is acute and slightly curved adaxially.
REMARKS
This is the first record of Geinitzia from the Albian clay of Archingeay-les Nouillers. Geinitzia sp. is only known from a single specimen (two opposite slabs of the same specimen, i.e. part and counterpart) preserved as an adpression. The leaves and stems are broken into small pieces displaying a charcoalified aspect. Cuticle is not clearly distinguishable. Spirally arranged, elongated, lanceolate leaves forming an acute angle with the main axis are known among several Cretaceous conifers such as Elatocladus (T.Halle, 1913) , Geinitzia and Pagiophyllum (Heer, 1881 emend. T.M. Harris [1979]) . The leaf base of Geinitzia differs from the constricted leaf base of Elatocladus ( Kvaček 1999) . The leaves of Geinitzia from Archingeay-Les Nouillers differ from the more elongated leaves of Pagiophyllum from the Cenomanian of Jaunay-Clan (Vienne; Valentin et al. 2014).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.