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CYATHITEPALA PAPILLOSA GEN. ET SP. NOV., A MID-CRETACEOUS FOSSIL FLOWER FROM MYANMAR AMBER WITH VALVATE ANTHERS

Although partially damaged prior to its preservation in coniferous resin, the flower of Cyathitepala papillosa retains enough morphological features to justify its description as a new genus and species of fossil angiosperms. The perianth is incomplete, but there are at least 6 large outer tepals an...

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Bibliographic Details
Published in:Journal of the Botanical Research Institute of Texas 2020-12, Vol.14 (2), p.351-358
Main Authors: Poinar, George O., Chambers, Kenton L.
Format: Article
Language:English
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Summary:Although partially damaged prior to its preservation in coniferous resin, the flower of Cyathitepala papillosa retains enough morphological features to justify its description as a new genus and species of fossil angiosperms. The perianth is incomplete, but there are at least 6 large outer tepals and numerous smaller, spirally arranged inner ones. The limbs of some of the larger tepals are cup-shaped and face abaxially, while the smaller inner tepals are flat or have adaxially folded margins. There is an inner series of erect, apically truncate tepals surrounding the stamens. The surfaces and margins of the tepals are densely papillate. There is a whorl of ca. 12 stamens with anthers that dehisce by two dorsally hinged valves. Nothing remains of the receptacle or pedicel of the flower, but the superior portion of the pistil is conic and bears two columnar, erect styles. The fossil is compared with three previously described fossil genera, Setitheca, Zygadelphus, and Strombothelya, which were suggested as having a possible relationship with certain families of order Laurales. A pesar del daño parcial anterior a su conservación en resina de coníferas, la flor de Cyathitepala papillosa retine suficientes características morfológicas para justificar su descripción como un nuevo género y especie fósil de angiospermas. El perianto es incompleto, pero hay al menos 6 tépalos externos grandes y numerosos internos más pequeños, ordenados espiralmente. Los limbos de algunos de los tépalos más grandes son en forma de copa y miran abaxialmente, mientras los tépalos internos más pequeños son planos o tienen los márgenes doblados adaxialmente. Hay una serie interna de tépalos erectos, truncados apicalmente rodeando a los estambres. Las superficies y márgenes de los tépalos son densamente papilosos. Hay un verticilo de ca. 12 estambres con anteras cuya dehiscencia es por dos valvas que se abren dorsalmente. No hay restos del receptáculo o pedicelo de la flor, pero la porción superior del pistilo es cónica y lleva dos estilos erectos columnares. El fósil se compara con tres géneros de fósiles descritos previamente, Setitheca, Zygadelphus, y Strombothelya, que sugieren tener posibles relaciones con ciertas familias del orden Laurales.
ISSN:1934-5259
2644-1608
DOI:10.17348/JBRIT.V14.I2.1013