Project 2106: R. K. Engelman, F. Anaya, D. A. Croft. 2017. New palaeothentid marsupials (Paucituberculata) from the middle Miocene of Quebrada Honda, Bolivia, and their implications for the palaeoecology, decline and extinction of the Palaeothentoidea. Journal of Systematic Palaeontology. 15 (10):787-820.
Specimen: † Acdestis maddeni (unvouchered)
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Abstract

Paucituberculatan marsupials, particularly members of the family Palaeothentidae, were important components of South American mammal communities during much of the Cenozoic. However, after the late early Miocene, palaeothentid remains are rare in the fossil record, and the group is last recorded at late middle Miocene sites in Colombia, Bolivia, and possibly Argentina. Here, we describe new specimens of palaeothentids from one of these late middle Miocene sites, Quebrada Honda, Bolivia, which include: (1) the first described lower dentitions of Acdestis maddeni, which exhibit distinctive features such as a greatly elongated paracristid and a single-rooted m4; (2) the first described late middle Miocene palaeothentines, representing two new species of Palaeothentes, P. serratus sp. nov. and P. relictus sp. nov., distinguished from other species of Palaeothentes by the presence of an anterobasal cingulid and reduced anterior trigonid crest, among other features; and (3) remains of a third new species, Chimeralestes ambiguus gen. et sp. nov., distinguished from other palaeothentids by its combination of a labially positioned cristid obliqua, reduced m4, and sharply curved entocristid. Phylogenetic and palaeoecological analyses show that Quebrada Honda palaeothentids were taxonomically and morphologically diverse and likely spanned a wide range of ecological niches. Combined with the wide geographic distribution of palaeothentoids during the late middle Miocene, this suggests that the disappearance of these marsupials was preceded by an abrupt rather than gradual decline in taxonomic and ecological diversity as well as geographic range.


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Article DOI: 10.1080/14772019.2016.1240112

Project DOI: 10.7934/P2106, http://dx.doi.org/10.7934/P2106
This project containsMatrices
  • 44 Media
  • 1 Matrix
  • 2 Documents
  • 68 Taxa
  • 13 Specimens
  • 90 Characters
Total size of project's media files: 395 MB

Download Project SDD File
Total scored cells: 3785
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 90
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 215
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:70/20
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MorphoBank Project 2106

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    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
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    Russell Engelman
    Project Administrator
    Last logged in 11/09/16
    68134490003785
    (3673, 0, 112)
    000
    Darin Croft
    Full membership
    Last logged in 02/16/16
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M24153' (62 Taxa)

    taxon unscored
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    [1] † Alphadon clemensi
    Last Modified in 08/08/16
    26616103002
    [2] † Pucadelphys andinus
    Last Modified in 08/08/16
    7808003002
    [3] Didelphis albiventris
    Last Modified in 08/08/16
    13747403002
    [4] † Derorhynchus singularis
    Last Modified in 08/08/16
    38515101002
    [5] † Fieratherium sorex
    Last Modified in 08/08/16
    37464508002
    [6] † Riolestes capricornicus
    Last Modified in 08/08/16
    65232302002
    [7] † Bardalestes sp.
    Last Modified in 08/08/16
    63262601002
    [8] † Bardalestes hunco
    Last Modified in 08/08/16
    72171701002
    [9] † Evolestes hadrommatos
    Last Modified in 08/08/16
    38525200002
    [10] † Evolestes sp.
    Last Modified in 08/08/16
    33575700002
    [11] Lestoros inca
    Last Modified in 08/08/16
    4858402002
    [12] Caenolestes fuliginosus
    Last Modified in 08/08/16
    3868502002
    [13] Rhyncholestes raphanurus
    Last Modified in 08/08/16
    2868602002
    [14] † Stilotherium dissimile
    Last Modified in 08/08/16
    5848302002
    [15] † Sp. nov. 2
    Last Modified in 11/09/16
    21676702002
    [16] † Pliolestes venetus
    Last Modified in 08/08/16
    52363602002
    [17] † Pliolestes tripotamicus
    Last Modified in 08/08/16
    38505002002
    [18] † Sp. nov. 1
    Last Modified in 11/09/16
    40484802002
    [19] † Sp. nov. 3
    Last Modified in 11/09/16
    58323200002
    [20] † Phonocdromus gracilis
    Last Modified in 08/08/16
    35515104002
    [21] † Sp. nov. 4
    Last Modified in 11/09/16
    12747404002
    [22] † Pichipilus riggsi
    Last Modified in 08/08/16
    14747402002
    [23] † Pichipilus centinelus
    Last Modified in 08/08/16
    16727202002
    [24] † Pichipilus osborni
    Last Modified in 08/08/16
    60303000002
    [25] † Pichipilus halleuxi
    Last Modified in 08/08/16
    60282802002
    [26] † Quirogalestes almagaucha
    Last Modified in 08/08/16
    63272700002
    [27] † Sp. nov. 5
    Last Modified in 11/09/16
    19696902002
    [28] † Sasawatsu mahaynaq
    Last Modified in 08/08/16
    55353500002
    [29] † Perulestes cardichi
    Last Modified in 08/08/16
    40505000002
    [30] † Perulestes fraileyi
    Last Modified in 08/08/16
    56323202002
    [31] † Pilchenia boliviensis
    Last Modified in 08/08/16
    23656502002
    [32] † Pilchenia lucina
    Last Modified in 08/08/16
    10808000002
    [33] † Pilchenia antiqua
    Last Modified in 08/08/16
    16747400002
    [34] † Pilchenia intermedia
    Last Modified in 08/08/16
    31595900002
    [35] † Carlothentes chubutensis
    Last Modified in 08/08/16
    41494900002
    [36] † Palaeothentes pascuali
    Last Modified in 08/08/16
    39484803002
    [37] † Palaeothentes minutus
    Last Modified in 08/08/16
    2878602002
    [38] † Palaeothentes intermedius
    Last Modified in 08/08/16
    6828202002
    [39] † Palaeothentes lemoinei
    Last Modified in 08/08/16
    2868602002
    [40] † Palaeothentes aratae
    Last Modified in 08/08/16
    8818101002
    [41] † Palaeothentes primus
    Last Modified in 08/08/16
    13777601002
    [42] † Palaeothentes marshalli
    Last Modified in 08/08/16
    10777703002
    [43] † Palaeothentes migueli
    Last Modified in 08/08/16
    10777703002
    [44] † Acdestis owenii
    Last Modified in 08/08/16
    0878604002
    [45] † Acdestis maddeni
    Last Modified in 08/08/16
    9787704002
    [46] † Trelewthentes rothi
    Last Modified in 08/08/16
    13757502002
    [47] † Titanothentes sp. nov.
    Last Modified in 11/09/16
    15737302002
    [48] † Titanothentes simpsoni
    Last Modified in 08/08/16
    38515101002
    [49] † Acdestodon bonapartei
    Last Modified in 08/08/16
    48403903002
    [50] † Parabderites bicrispatus
    Last Modified in 08/08/16
    11787801002
    [51] † Parabderites minisculus
    Last Modified in 08/08/16
    46444400002
    [52] † Abderites crispus
    Last Modified in 08/08/16
    19686803002
    [53] † Abderites meridionalis
    Last Modified in 08/08/16
    16727202002
    [54] † Abderites aisenense
    Last Modified in 08/08/16
    28606002002
    [55] † Pitheculites minimus
    Last Modified in 08/08/16
    16737202002
    [56] † Pitheculites chenche
    Last Modified in 08/08/16
    53373700002
    [57] † Pitheculites rothi
    Last Modified in 08/08/16
    64262600002
    [58] † Antawallalestes illimani
    Last Modified in 08/08/16
    8828200002
    [59] † Antawallalestes quimsacruza
    Last Modified in 08/08/16
    39515100002
    [60] † Palaeothentes relictus
    Last Modified in 08/08/16
    53343403002
    [61] † Chimeralestes ambiguus
    Last Modified in 08/08/16
    66212103002
    [62] † Palaeothentes serratus
    Last Modified in 08/08/16
    7787805002


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