Project 2506: N. A. Jud,M. A. Gandolfo,A. Iglesias,P. Wilf. 2017. Flowering after disaster: Early Danian buckthorn (Rhamnaceae) flowers and leaves from Patagonia. PLOS ONE. 12 (5):e0176164.
Specimen: † Notiantha grandensis (MEF:MEF-Pb 8548a)
View: Transverse

Abstract

Southern-Hemisphere terrestrial communities from the early Paleocene are poorly known, but recent work on Danian plant fossils from the Salamanca Formation in Chubut Province, Argentina are providing critical data on earliest Paleocene floras. The fossils described here come from a site in the Salamanca Formation dating to ca. 1 million years or less after the end-Cretaceous extinction event; they are the first fossil flowers reported from the Danian of South America, and possible the entire Southern Hemisphere. They are compressions and impressions in flat-laminated light gray shale, and they belong to the family Rhamnaceae (buckthorns). Flowers of Notiantha grandensis gen. et sp. nov. are pentamerous, with distinctly keeled calyx lobes projecting from the hypanthium, clawed and cucullate emarginate petals, antepetalous stamens, and a pentagonal floral disk that fills the hypanthium. Their phylogenetic position was evaluated using a molecular scaffold approach combined with morphological data. Results indicate that the flowers are most like those of extant ziziphoid Rhamnaceae. The associated leaves, assigned to Suessenia grandensis gen. et sp. nov. are simple and ovate, with serrate margins and three acrodromous basal veins. They conform to the distinctive leaves of some extant Rhamnaceae in the ziziphoid and ampelozizyphoid clades. These fossils provide the first unequivocal megafossil evidence of Rhamnaceae in the Southern Hemisphere, demonstrating that Rhamnaceae expanded beyond the tropics by the earliest Paleocene. Given previous reports of rhamnaceous pollen in the late Paleogene and Neogene of Antarctica and southern Australia, this new occurrence increases the possibility of high-latitude dispersal of this family between South America and Australia via Antarctica during the Cenozoic.


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Article DOI: 10.1371/journal.pone.0176164

Project DOI: 10.7934/P2506, http://dx.doi.org/10.7934/P2506
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 31 Taxa
  • 1 Specimen
  • 30 Characters
Total size of project's media files: 1 MB

Download Project SDD File
Total scored cells: 760
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 30
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 135
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:30/0
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MorphoBank Project 2506

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    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Nathan Jud
    Project Administrator
    Last logged in 06/09/17
    31113000760
    (756, 0, 4)
    000


    Taxonomic Overview for Matrix 'M24392' (25 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] Vitis
    Last Modified in 01/06/17
    2282800001
    [2] Mortonia
    Last Modified in 01/06/17
    3282700001
    [3] Ampelozizyphus
    Last Modified in 01/06/17
    0303000001
    [4] Bathiorhamnus
    Last Modified in 01/06/17
    1422900001
    [5] Ventilago
    Last Modified in 01/06/17
    1332900001
    [6] Berchemia
    Last Modified in 01/06/17
    1302900001
    [7] Sageretia
    Last Modified in 01/06/17
    1302900001
    [8] Rhamnus
    Last Modified in 01/06/17
    0363000001
    [9] Reynosia
    Last Modified in 01/06/17
    1312900001
    [10] Krugiodendron
    Last Modified in 01/06/17
    5242302001
    [11] Condalia
    Last Modified in 01/06/17
    0313000001
    [12] Karwinskia
    Last Modified in 01/06/17
    1292900001
    [13] Pomaderris
    Last Modified in 01/06/17
    2302800001
    [14] Adolphia
    Last Modified in 01/06/17
    4272600001
    [15] Colletia
    Last Modified in 01/06/17
    9191902001
    [16] Noltea
    Last Modified in 01/06/17
    1292900001
    [17] Ceanothus
    Last Modified in 01/06/17
    0333000001
    [18] Colubrina
    Last Modified in 01/06/17
    2292800001
    [19] Gouania
    Last Modified in 01/06/17
    1312900001
    [20] Helinus
    Last Modified in 01/06/17
    1292900001
    [21] Sarcomphalus
    Last Modified in 01/06/17
    1332900001
    [22] Hovenia
    Last Modified in 01/06/17
    1312900001
    [23] Paliurus
    Last Modified in 01/06/17
    0353000001
    [24] Ziziphus
    Last Modified in 01/06/17
    1322900001
    [25] † Notiantha grandensis
    Last Modified in 06/09/17
    5262500001


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    Specimen list296




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