Project 5499: C. Sanchez-Posada, R. A. Racicot, I. Ruf, M. Krings, G. E. Rössner. 2024. Romaleodelphis pollerspoecki , gen. et sp. nov., an archaic dolphin from the Central Paratethys (Early Miocene, Austria). Journal of Vertebrate Paleontology. epub ahead of print:e2401503.
Specimen: † Romaleodelphis pollerspoecki Sánchez Posada, Racicot, Ruf, Krings & Rössnerv, 2024 (SNSB-BSPG/1992 I 10:10)
View: dorsal

Abstract

A new long-snouted homodont odontocete fossil from the Lower Miocene of Austria (ca. 22.5–22.0 Ma) is formally described and interpreted based on external skull characteristics supplemented by CT and μCT data. The specimen was found in deposits from the Central Paratethys and includes an incomplete and fragmented cranium and mandible as well as ear bones. It differs markedly from previously identified long-snouted archaic dolphins with single-rooted, homodont dentition, and thus is suggestive of a new taxon, for which the name Romaleodelphis pollerspoecki gen. et sp. nov. is proposed. The geological context of R. pollerspoecki hints at a neritic habitat in close vicinity to estuarine environments. Romaleodelphis pollerspoecki shares key features with certain members of the so-called ‘Chilcacetus clade’ such as the widening of the premaxillae at the rostrum base and the absence of a deep lateral groove along the rostrum; however, a phylogenetic analysis reconstructs R. pollerspoecki in a polytomy with members of this ‘clade’ and a larger clade including many other taxa. To better understand the phylogenetic relationships of these taxa, comprehensive reexamination of Argryocetus and Macrodelphinus will be necessary. Measurements obtained through μCT-based internal anatomical reconstruction of the bony labyrinth indicate that R. pollerspoecki had the ability to hear specialized high-frequency signals similar to modern narrow-band high-frequency (NBHF) specialists. This work further identifies several extinct platanistoids as hearing within the NBHF spectrum, increasing the understanding of the diversity of ecological adaptations in early-diverging odontocetes and providing more examples of convergent evolution of this hearing type.


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Article DOI: 10.1080/02724634.2024.2401503

Project DOI: 10.7934/P5499, http://dx.doi.org/10.7934/P5499
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 39 Taxa
  • 1 Specimen
  • 77 Characters
Total size of project's media files: 6.42M

Download Project SDD File
Total scored cells: 2459
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 77
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 187
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:77/0
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MorphoBank Project 5499

    Authors' Institutions

    • Jilin University

    • Johann Wolfgang Goethe-Universitaet Frankfurt

    • Ludwig-Maximilians-Universitaet Muenchen

    • Bayerische Staatssammlung fuer Palaeontologie und Geologie

    • Senckenberg Research Institute (Forschungsinstitut Senckenberg)



    Members

    member name taxa specimens media media
    notes
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    notes  media
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    (scored, NPA, "-")
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    Gertrud Rössner
    Project Administrator
    391107700002459
    (2325, 0, 134)
    00000
    Michael Krings
    Full membership
    0000000000
    (0, 0, 0)
    00000
    Rachel Racicot
    Full membership
    0000000000
    (0, 0, 0)
    00000
    Irina Ruf
    Full membership
    0000000000
    (0, 0, 0)
    00000
    Catalina Sanchez-Posada
    Full membership
    0000000000
    (0, 0, 0)
    00000


    Taxonomic Overview for Matrix 'M30150' (38 Taxa)

    taxon unscored
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    [1] † zygorhiza
    Taxon name last Modified on 11/05/24
    1717105005
    [2] † squalodon
    Taxon name last Modified on 11/05/24
    2717005005
    [3] † waipatia
    Taxon name last Modified on 11/05/24
    6666605005
    [4] † chilcacetus
    Taxon name last Modified on 11/05/24
    8646405005
    [5] † Argyrocetus bakersfieldensis
    Taxon name last Modified on 11/05/24
    43292905005
    [6] † Argyrocetus joaquinensis
    Taxon name last Modified on 11/05/24
    28444405005
    [7] † macrodelphinus
    Taxon name last Modified on 11/05/24
    37353505005
    [8] † argyrocetus-patagonicus
    Taxon name last Modified on 11/05/24
    31414105005
    [9] † eoplatanista
    Taxon name last Modified on 11/05/24
    4696805005
    [10] † eurhinodelphis
    Taxon name last Modified on 11/05/24
    10626205005
    [11] † schizodelphis
    Taxon name last Modified on 11/05/24
    4686805005
    [12] † ziphiodelphis
    Taxon name last Modified on 11/05/24
    5676705005
    [13] † xiphiacetus
    Taxon name last Modified on 11/05/24
    4716805005
    [14] † squaloziphius
    Taxon name last Modified on 11/05/24
    35393903005
    [15] indopacetus
    Taxon name last Modified on 09/10/24
    5727101005
    [16] mesoplodon
    Taxon name last Modified on 09/10/24
    0777601005
    [17] hyperoodon
    Taxon name last Modified on 09/10/24
    3737301005
    [18] ziphius
    Taxon name last Modified on 09/10/24
    0777601005
    [19] † berardius
    Taxon name last Modified on 11/05/24
    3737301005
    [20] † nazcacetus
    Taxon name last Modified on 11/05/24
    12656500005
    [21] tasmacetus
    Taxon name last Modified on 09/10/24
    0777700005
    [22] † messapicetus
    Taxon name last Modified on 11/05/24
    3757400005
    [23] † ziphirostrum
    Taxon name last Modified on 11/05/24
    35434200005
    [24] † ninoziphius
    Taxon name last Modified on 11/05/24
    7717000005
    [25] † kentriodon
    Taxon name last Modified on 11/05/24
    2707005005
    [26] pontoporia
    Taxon name last Modified on 09/10/24
    0727205005
    [27] delphinus
    Taxon name last Modified on 09/10/24
    0727205005
    [28] † yaquinacetus
    Taxon name last Modified on 11/05/24
    12656500005
    [29] huaridelphis
    Taxon name last Modified on 09/10/24
    14585805005
    [30] † notocetus
    Taxon name last Modified on 11/05/24
    3696905005
    [31] † squalodelphis
    Taxon name last Modified on 11/05/24
    8646405005
    [32] platanista
    Taxon name last Modified on 09/10/24
    0727205005
    [33] † zarachis
    Taxon name last Modified on 11/05/24
    4686805005
    [34] † pomatodelphis
    Taxon name last Modified on 11/05/24
    9636305005
    [35] † zarhinocetus
    Taxon name last Modified on 11/05/24
    18545405005
    [36] † allodelphis
    Taxon name last Modified on 11/05/24
    26464605005
    [37] † araeodelphis
    Taxon name last Modified on 11/05/24
    60171700005
    [38] † romaleodelphis
    Taxon name last Modified on 11/05/24
    36353506005


    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project7
    Project downloads1
    Matrix downloads4NEXUS file containing the data matrix and character descriptions used for phylogenetic analysis (4 downloads);
    Media downloads2M920196 (2 downloads);