Tropidogyne euthystyla sp. nov., a new small-flowered addition to the genus from mid-Cretaceous Myanmar amber
DOI:
https://doi.org/10.17348/jbrit.v15.i1.1053Resumen
Tropidogyne euthystyla, que se describe aquí, es la cuarta especie de este género fósil que ha sido reportada de depósitos de ámbar en el norte de Myanmar. Las especies son similares en las características del cáliz, la forma y venación del ovario ínfero, y la ausencia de pétalos. Difieren en el número y la forma de los estilos, la lobulación del disco epigino, tanto si las flores son aparentemente bisexuales o unisexuales. En la única especie para la que hay varias flores disponibles para su estudio, T. pentaptera, los diámetros florales varían de 3,5 a 5,0 mm. La especie actual, conocida sólo a partir de una sola flor, es la más pequeña del género, con un diámetro floral de sólo 2 mm. Se diferencia de las 3 especies descritas anteriormente por tener 2 estilos robustos y erectos que llevan un estigma terminal, mientras que las otras especies tienen 2 o 3 estilos cortos o largos, arqueados que son estigmáticos decurrentemente a lo largo de la superficie adaxial.
Citas
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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.
Rogers, Z.S. 2002. A new species of Weinmannia (Cunoniaceae: Cunonieae) from southern Ecuador. Novon 12:249–252.
Rozefelds, A.C. & R.W. Barnes. 2002. The systematic and biogeographical relationships of Ceratopetalum (Cunoniaceae) in Australia and New Zealand. Int. J. Pl. Sci. 163:651–673.
Rozefelds, A.C. & B. Pellow. 2011. A taxonomic revision of Pseudoweinmannia Engl. (Cunoniaceae: Geissoieae). Austrobaileya 8:252–266.
Rozefelds, A.C., R.W. Barnes, & B. Pellow. 2001. A new species and comparative morphology of Vesselowskya (Cunoniaceae). Austral. Syst. Bot. 14:175–192.
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.
Sokol, J. 2019. Troubled treasure. Science 364:722–729.
Barnes, R.W. & A.C. Rozefelds. 2000. Comparative morphology of Anodopetalum (Cunoniaceae). Austral. Syst. Bot. 13:267–282.
Bradford, J.C., H.C.F. Hopkins, & R.W. Barnes. 2004. Cunoniaceae. In: K. Kubitzki, ed. The families and genera of vascular plants. Springer Verlag, Berlin, Germany. 6:91–111.
Chambers, K.L. & G.O. Poinar, JR. 2020. Thymolepis toxandra gen. et sp. nov., a mid-Cretaceous fossil flower with horseshoe-shaped anthers. J. Bot. Res. Inst. Texas 14:57–64.
Chambers, K.L., G.O. Poinar, JR., & R. Buckley. 2010. Tropidogyne, a new genus of Early Cretaceous eudicots (Angiospermae) from Burmese amber. Novon 20:23–29.
Crepet, W.L., K.C. Nixon, D. Grimaldi, & M. Riccio. 2016. A mosaic Lauralean flower from the Early Cretaceous of Myanmar. Amer. J. Bot. 103:290–297.
Cruickshank, R.D. & K. Ko. 2003. Geology of an amber locality in the Hukawng Valley, northern Myanmar. J. Asian Earth Sci. 21:441–455.
Dickison, W.C. 1989. Comparisons of primitive Rosidae and Hamamelidae. In: P.R. Crane & S. Blackmore, eds. Evolution, systematics and fossil history of the Hamamelidae. Clarendon Press, Oxford, UK. 1:47–73.
Gandolfo, M.S. & E.J. Hermsen. 2017. Ceratopetalum (Cunoniaceae) fruits of Australasian affinity from the early Eocene Laguna del Hunco flora, Patagonia, Argentina. Ann. Bot. 119:507–516.
Hopkins, H.C.F. 2018. The taxonomy and morphology of Schizomeria (Cunoniaceae) in New Guinea, the Moluccas, and the Solomon Islands, with notes on seed dispersal and uses throughout the genus. Kew Bull. 73:11–21.
Hopkins, H.C.F., A.C. Rozefelds, & Y. Pillon. 2013. Karrabina gen. nov. (Cunoniaceae), for the Australian species previously placed in Geissois, and a synopsis of genera in the tribe Geissoieae. Austral. Syst. Bot. 26:167–185.
Liu, Z-J., D. Huang, C. CAI, & Z. Wang. 2018. The core eudicot boom registered in Myanmar amber. Sci. Rep. 8:16765.
Pillon, Y., H.C.F. Hopkins, & J.C. Bradford. 2008. Two new species of Cunonia (Cunoniaceae) from New Caledonia. Kew. Bull. 63:419–431.
Poinar, G.O., JR. & K.L. Chambers. 2017. Tropidogyne pentaptera sp. nov., a new mid-Cretaceous fossil angiosperm flower in Burmese amber. Palaeodiversity 10:135–140.
Poinar, G.O., JR. & K.L. Chambers. 2018. Endobeuthos paleosum gen. et sp. nov., fossil flowers of uncertain affinity from mid-Cretaceous Myanmar amber. J. Bot. Res. Inst. Texas 12:133–139.
Poinar, G.O., JR. & K.L. Chambers. 2019a. Dispariflora robertae gen. et sp. nov., a mid-Cretaceous flower of possible Lauralean affinity from Myanmar amber. J. Bot. Res. Inst. Texas 13:173–183.
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. 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. Chainandra zeugostylus gen. et sp. nov., a mid-Cretaceous amber fossil with sagittate anthers opening widely at maturity. J. Bot. Res. Inst. Texas 14:357–372.
Poinar, G.O., JR. & S. Ellenberger. 2020. Burmese amber fossils, mining, sales and profits. Geoconserv. Res. 3:12–16.
Poinar, G.O., JR., R. Buckley, & A. Brown. 2006. The secrets of Burmese amber. Mid Amer. Paleontol. Soc. Digest 29:20–29.
Poinar, G.O., JR., K.L. Chambers, & J. Wunderlich. 2013. Micropetasos, a new genus of angiosperms from mid-Cretaceous Burmese amber. J. Bot. Res. Inst. Texas 7:745–750.
Poinar, G.O., JR., K.L. Chambers, U.T. Iwaniec, & F.E. Vega. 2020. Valviloculus pleristaminis gen. et sp. nov., a Lauralean fossil flower with valvate anthers from mid-Cretaceous Myanmar amber. J. Bot. Res. Inst. Texas 14:359–366.
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.
Rogers, Z.S. 2002. A new species of Weinmannia (Cunoniaceae: Cunonieae) from southern Ecuador. Novon 12:249–252.
Rozefelds, A.C. & R.W. Barnes. 2002. The systematic and biogeographical relationships of Ceratopetalum (Cunoniaceae) in Australia and New Zealand. Int. J. Pl. Sci. 163:651–673.
Rozefelds, A.C. & B. Pellow. 2011. A taxonomic revision of Pseudoweinmannia Engl. (Cunoniaceae: Geissoieae). Austrobaileya 8:252–266.
Rozefelds, A.C., R.W. Barnes, & B. Pellow. 2001. A new species and comparative morphology of Vesselowskya (Cunoniaceae). Austral. Syst. Bot. 14:175–192.
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.
Sokol, J. 2019. Troubled treasure. Science 364:722–729.
Publicado
2021-07-23
Cómo citar
Poinar, Jr., G. O., Chambers, K. L., & Vega, F. E. (2021). Tropidogyne euthystyla sp. nov., a new small-flowered addition to the genus from mid-Cretaceous Myanmar amber. Journal of the Botanical Research Institute of Texas, 15(1), 113–119. https://doi.org/10.17348/jbrit.v15.i1.1053
Número
Sección
PALEOBOTÁNICA
