Open AccessTropidogyne lobodisca sp. nov., a third species of the genus from mid-Cretaceous Myanmar amber
Author(s) -
George Poinar,
Kenton L. Chambers
Publication year - 2019
Publication title -
journal of the botanical research institute of texas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.316
H-Index - 22
eISSN - 2644-1608
pISSN - 1934-5259
DOI - 10.17348/jbrit.v13.i2.798
Subject(s) - sepal , stamen , apex (geometry) , biology , cretaceous , petal , genus , nectar , gynoecium , ovary , botany , key (lock) , paleontology , pollen , ecology , endocrinology
The fossil flower described here is the third species of Tropidogyne to have been collected from mid-Cretaceous amber deposits in the Hukawng Valley of northwestern Myanmar. The flower of Tropidogyne lobodisca differs from the 2 previously described species, T. pikei and T. pentaptera, in lacking stamens and having a 5-lobed nectar disc covering the apex of the ovary. Its 2 slender, curved, attenuate styles are like those of T. pentaptera in being stigmatic along the adaxial surface. The new species has 5 spreading, reticulately-veined sepals, a generic character of Tropidogyne. An unusual, probably teratological, feature is the presence of 2 sepal-like staminodes on one side of the flower, inserted at the base of the nectar disc where stamens would otherwise be found. The inferior portion of the pistil is obconic, with 5 distinct veins that connect to the mid-nerves of the sepals.