Project 779: H. M. Sallam, E. R. Seiffert, E. L. Simons. 2011. Craniodental Morphology and Systematics of a New Family of Hystricognathous Rodents (Gaudeamuridae) from the Late Eocene and Early Oligocene of Egypt. PLOS ONE. 6 (2):e16525.
Specimen: Thryonomys swinderianus (Museum of Comparative Zoology/MCZ:56868)

Abstract

Background: Gaudeamus is an enigmatic hystricognathous rodent that was, until recently, known solely from fragmentary material from early Oligocene sites in Egypt, Oman, and Libya. Gaudeamus’ molars are similar to those of the extant cane rat Thryonomys, and multiple authorities have aligned Gaudeamus with Thryonomys to the exclusion of other living and extinct African hystricognaths; recent phylogenetic analyses have, however, also suggested affinities with South American caviomorphs or Old World porcupines (Hystricidae).
Methodology/Principal Findings: Here we describe the oldest known remains of Gaudeamus, including largely complete but crushed crania and complete upper and lower dentitions. Unlike younger Gaudeamus species, the primitive species described here have relatively complex occlusal patterns, and retain a number of plesiomorphic features. Unconstrained parsimony analysis nests Gaudeamus and Hystrix within the South American caviomorph radiation, implying what we consider to be an implausible back-dispersal across the Atlantic Ocean to account for Gaudeamus’ presence in the late Eocene of Africa. An analysis that was constrained to recover the biogeographically more plausible hypothesis of caviomorph monophyly does not place Gaudeamus as a stem caviomorph, but rather as a sister taxon of hystricids.
Conclusions/Significance: We place Gaudeamus species in a new family, Gaudeamuridae, and consider it likely that the group originated, diversified, and then went extinct over a geologically brief period of time during the latest Eocene and early Oligocene in Afro-Arabia. Gaudeamurids are the only known crown hystricognaths from Afro-Arabia that are likely to be aligned with non-phiomorph members of that clade, and as such provide additional support for an Afro-Arabian origin of advanced stem and basal crown members of Hystricognathi.


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Project DOI: 10.7934/P779, http://dx.doi.org/10.7934/P779
This project containsMatrices
  • 17 Media
  • 1 Matrix
  • 51 Taxa
  • 9 Specimens
  • 118 Characters
Total size of project's media files: 43 MB

Download Project SDD File
Total scored cells: 4530
Total media associated with cells: 16
Total labels associated with cell media: 0
Characters
Total characters: 118
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 467
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:118/0
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MorphoBank Project 779

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    Simone Hoffmann
    Project Administrator
    Last logged in 08/08/12
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    Maureen O'Leary
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    Hesham Sallam
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    Alan Turner
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    Taxonomic Overview for Matrix 'M1781' (51 Taxa)

    taxon unscored
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    [1] † Anadianomys declivis
    Last Modified in 12/05/13
    37818100005
    [2] † Baluchimys ganeshapher
    Last Modified in 12/05/13
    31878700005
    [3] † Baluchimys krabiense
    Last Modified in 12/05/13
    42767600005
    [4] † Birbalomys spp.
    Last Modified in 12/05/13
    211611600005
    [5] † Branisamys luribayensis
    Last Modified in 12/05/13
    22969600005
    [6] † Bugtimys zafarullahi
    Last Modified in 12/05/13
    1510310300005
    [7] † Chapattimys wilsoni
    Last Modified in 12/05/13
    1210610600005
    [8] † Confiniummys sidiki
    Last Modified in 12/05/13
    21979700005
    [9] † Diamantomys luederitzi
    Last Modified in 12/05/13
    29898900005
    [10] † Eobranisamys romeropittmanae
    Last Modified in 12/05/13
    45737300005
    [11] † Eosallamys paulacoutoi
    Last Modified in 12/05/13
    22969600005
    [12] † Gaudeamus aegyptius
    Last Modified in 12/05/13
    1510310300005
    [13] † Gaudeamus aslius
    Last Modified in 12/05/13
    161029500705
    [14] † Gaudeamus cf. aslius
    Last Modified in 12/05/13
    70484800005
    [15] † Gaudeamus hylaeus
    Last Modified in 12/05/13
    161029700505
    [16] † Hodsahibia spp.
    Last Modified in 12/05/13
    411411400005
    [17] † Hystrix depereti
    Last Modified in 12/05/13
    1710110100005
    [18] † Hystrix primigenia
    Last Modified in 12/05/13
    30888800005
    [19] † Incamys spp.
    Last Modified in 12/05/13
    1210610600005
    [20] † Lindsaya derabugtiensis
    Last Modified in 12/05/13
    25939300005
    [21] † Lophibaluchia spp.
    Last Modified in 12/05/13
    35838300005
    [22] † Metaphiomys beadnelli
    Last Modified in 12/05/13
    24949400005
    [23] † Ottomania proavita
    Last Modified in 12/05/13
    1110710700005
    [24] † Paraphiomys spp.
    Last Modified in 12/05/13
    23959500005
    [25] † ”Paraphiomys” simonsi
    Last Modified in 12/05/13
    36828200005
    [26] † Paraulacodus indicus
    Last Modified in 12/05/13
    34848400005
    [27] † Petrokozlovia notos
    Last Modified in 12/05/13
    29898900005
    [28] † Phiocricetomys minutus
    Last Modified in 12/05/13
    69474702005
    [29] † Phiomys
    Last Modified in 12/05/13
    59595900005
    [30] † Phiomys paraphiomyoides
    Last Modified in 12/05/13
    1180000005
    [31] † Phiomys andrewsi
    Last Modified in 12/05/13
    21979700005
    [32] † Phiomys hammudai
    Last Modified in 12/05/13
    1180000005
    [33] † ”Phiomys” lavocati
    Last Modified in 12/05/13
    23959500005
    [34] † ”Phiomys aff. paraphiomyoides”
    Last Modified in 12/05/13
    46727200005
    [35] † Platypittamys brachyodon
    Last Modified in 12/05/13
    23959500005
    [36] † Protophiomys aegyptensis
    Last Modified in 12/05/13
    24949300105
    [37] † Protophiomys algeriensis
    Last Modified in 12/05/13
    611211200005
    [38] † Protophiomys durattalahensis
    Last Modified in 12/05/13
    26929200005
    [39] † Protophiomys aff. durattalahensis
    Last Modified in 12/05/13
    25939300005
    [40] † Sacaresia moyaeponsi
    Last Modified in 12/05/13
    1110710700005
    [41] † Sallamys pascuali
    Last Modified in 12/05/13
    1210610600005
    [42] † Talahphiomys libycus
    Last Modified in 12/05/13
    55636300005
    [43] † Talahphiomys lavocati
    Last Modified in 12/05/13
    39797900005
    [44] Thryonomys swinderianus
    Last Modified in 12/05/13
    25939100205
    [45] † Tsaganomys altaicus
    Last Modified in 12/05/13
    511311300005
    [46] † Waslamys attiai
    Last Modified in 12/05/13
    811010900105
    [47] † Yuomys cavioides
    Last Modified in 12/05/13
    30888800005
    [48] † New genus and species 3 (l-41)
    Last Modified in 12/05/13
    19999900005
    [49] † New genus and species 2 (l-41)
    Last Modified in 12/05/13
    611211200005
    [50] † New genus and species 1 (l-41)
    Last Modified in 12/05/13
    611211200005
    [51] † New genus and species (quarry a & e)
    Last Modified in 12/05/13
    39797900005


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