Cyathitepala papillosa gen. et sp. nov., a mid-Cretaceous fossil flower from Myanmar amber with valvate anthers

  • George O. Poinar, Jr. Department of Integrative Biology, Oregon State University
  • Kenton L. Chambers Department of Botany and Plant Pathology, Oregon State University

Abstract

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.

References

Chambers, K.L. & G.O. Poinar, Jr. 2020. Thymolepis toxandra gen. et sp. nov., a mid-Cretaceous fossil flower with horseshoeshaped anthers. J. Bot. Res. Inst. Texas 14:57–64.

Cohen, K.M., S. Finney, & P.L. Gibbard. 2013. International Chronostratigraphic Chart. International Commission on Stratigraphy. www.stratigraphy.org. Accessed Jul 2020.

Cruickshank, R.D. & K. Ko. 2003. Geology of an amber locality in the Hukawng Valley, northern Myanmar. J. Asian Earth Sci. 21:441–455.

Endress, P.K. 1980. Floral structure and relationships of Hortonia (Monimiaceae). Pl. Syst. Evol. 133:199–221.

Endress, P.K. & J.A. Doyle. 2007. Floral phyllotaxis in basal angiosperms: Development and evolution. Curr. Opin. Pl. Biol. 10:52–57.

Endress, P.K. & L.D. Hufford. 1989. The diversity of stamen structures and dehiscence patterns among Magnoliidae. Bot. J. Linn. Soc. 100:45–85.

Friis, E.M., P.R. Crane, & K.R. Pedersen. 2011. Early flowers and angiosperm evolution. Cambridge University Press, Cambridge, UK.

Kubitzki, K. 1993. Hernandiaceae. In: K. Kubitzki, J.G. Rohwer, and V. Bittrich, eds. The families and genera of vascular plants. Springer Verlag, Berlin, Germany. 2:334–338.

Lorence, D.H. 1985. A monograph of the Monimiaceae (Laurales) in the Malagasy region (Southwest Indian Ocean). Ann. Missouri Bot. Gard. 72:1–165.

Perkins, J. & E. Gilg. 1901. Monimiaceae. In: A. Engler, ed. Das Pflanzenreich. Verlag Wilhelm Engelmann, Leipzig, Germany. IV. 101:1–122.

Philipson, W.R. 1993. Monimiaceae. In: K. Kubitzki, J.G. Rohwer, and V. Bittrich, eds. The families and genera of vascular plants. Springer Verlag, Berlin, Germany. 2:426–437.

Poinar, G.0., Jr. 2018. Mid-Cretaceous angiosperm flowers in Myanmar amber. In: B. Welch & M. Wilkerson, eds. Recent advances in plant research. Nova Science Publishers, New York, U.S.A. Pp. 187–218.

Poinar, G.O., Jr. & K.L. Chambers, 2018a. Endobeuthos paleosum gen. et sp. nov., fossil flowers of uncertain affinity from mid-Cretaceous Myanmar amber. J. Bot. Res. Inst. Texas 12:333–339.

Poinar, G.O., Jr. & K.L. Chambers. 2018b. Setitheca lativalva gen. et sp. nov., a fossil flower of Laurales from mid-Cretaceous Myanmar amber. J. Bot. Res. Inst. Texas 12:643–653.

Poinar, G.O., Jr. & K.L. Chambers. 2018c. Fossil flowers of Lachnociona camptostylus sp. nov., a second record for the genus in mid-Cretaceous Myanmar amber. J. Bot. Res. Inst. Texas 12:655–666.

Poinar, G.O., Jr. & K.L. Chambers. 2019a. Strombothelya gen. nov., a fossil angiosperm with two species in mid-Cretaceous Myanmar amber. J. Bot. Res. Inst. Texas 13:451–460.

Poinar, G.O., Jr. & K.L. Chambers. 2019b. Tropidogyne lobodisca sp. nov., a third species of the genus from mid-Cretaceous Myanmar amber. J. Bot. Res. Inst. Texas 13:461–466.

Poinar, G.O., Jr. & K.L. Chambers. 2019c. Zygadelphus aetheus gen. et sp. nov., an unusual fossil flower from mid-Cretaceous Myanmar amber. J. Bot. Res. Inst. Texas 13:467–473.

Poinar, G.0., Jr. & K.L. Chambers. 2020a. Dasykothon leptomiscus gen.et sp. nov., a fossil flower of possible Lauralean affinity from Myanmar amber. J. Bot. Res. Inst. Texas 14:65–71.

Poinar, G.O., Jr. & K.L. Chambers. 2020b. Phantophlebia dicycle gen. et sp. nov., a five-merous fossil flower in mid-Cretaceous Myanmar amber. J. Bot. Res. Inst. Texas 14:73–80.

Poinar, G.O., Jr., G.J.B. Lambert, & Y. Wu. 2007. Araucarian source of fossiliferous Burmese amber: Spectroscopic and anatomical evidence. J. Bot. Res. Inst. Texas 1:449–455.

Rohwer, J.G. 1993. Lauraceae. In: K. Kubitzki, J.G. Rohwer, and V. Bittrich, eds. The families and genera of vascular plants. Springer Verlag, Berlin, Germany. 2:366–390.

Renner, S.S. 1999. Circumscription and phylogeny of the Laurales: Evidence from molecular and morphological data. Amer. J. Bot. 86:1301–1315.

Renner, S.S. 2004. Variation in diversity among Laurales, Early Cretaceous to present. Biol. Skr. 55:441–458.

Renner, S.S., J.S. Strijk, D. Strasberg, & C. Thebaud. 2010. Biogeography of the Monimiaceae (Laurales): A role for East Gondwana and long-distance dispersal, but not West Gondwana. J. Biogeog. 37:1227–1238.

Shi, G., D.A. Grimaldi, G.E. Harlow, J. Wang, M. Yang, W. Lei, Q. Li, & X. Li. 2012. Age constraint on Burmese amber based on U–Pb dating of zircons. Cretaceous Res. 37:155–163.

Published
2020-12-07
How to Cite
Poinar, Jr., G. O., & Chambers, K. L. (2020). Cyathitepala papillosa gen. et sp. nov., a mid-Cretaceous fossil flower from Myanmar amber with valvate anthers. Journal of the Botanical Research Institute of Texas, 14(2), 351-358. https://doi.org/10.17348/jbrit.v14.i2.1013