Project 571: L. T. Holbrook, J. Lapergola. 2011. A New Genus of Perissodactyl (Mammalia) from the Bridgerian of Wyoming, with Comments on Basal Perissodactyl Phylogeny. Journal of Vertebrate Paleontology. 31 (4):895-901.
Specimen: Mesolambdolophus setoni (MCZ:19585)
View: lateral dentary

Abstract

An unusual specimen of a perissodactyl from the Bridgerian (late early to early middle Eocene) of Wyoming provides the basis for a new genus and species, Mesolambdolophus setoni. The specimen (MCZ 19585) displays an unusual combination of features: first lower premolar absent; p2 and p3 not molariform; p4 submolariform; anterior end of metalophid lingually placed, contacting metaconid; metaconid not twinned; and large hypoconulid on m3. The orientation of the metalophid excludes this specimen from Ceratomorpha, and the size and characters of this specimen exclude it from any known genus of Bridgerian perissodactyl, as well as from any other Eocene perissodactyl taxon. Including this taxon in a phylogenetic analysis of basal perissodactyls places Mesolambdolophus as sister taxon to Tapiromorpha, but we consider any assessment of the position of Mesolambdolophus tentative at best, given the limitations of analyses of basal perissodactyls currently available. The presence of a small Bridgerian ‘hippomorph’ form that is larger than Orohippus reduces the reliability of assigning isolated postcrania to Bridgerian perissodactyl taxa on the basis of size.


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Project DOI: 10.7934/P571, http://dx.doi.org/10.7934/P571
This project containsMatrices
  • 5 Media
  • 1 Matrix
  • 1 Document
  • 43 Taxa
  • 1 Specimen
  • 125 Characters
Total size of project's media files: 2 MB

Download Project SDD File
Total scored cells: 4383
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 125
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 317
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:125/0
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MorphoBank Project 571

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    Taxonomic Overview for Matrix 'M1284' (42 Taxa)

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    [1] Phenacodontids
    Last Modified in 12/05/13
    1109105019004
    [2] Radinskya
    Last Modified in 12/05/13
    74494902004
    [3] Phenacolophids
    Last Modified in 12/05/13
    219292012004
    [4] Tethytheres
    Last Modified in 12/05/13
    1115113011004
    [5] Hyracoids
    Last Modified in 12/05/13
    1116114010004
    [6] Hallensia
    Last Modified in 12/05/13
    412012001004
    [7] H. leporinum
    Last Modified in 12/05/13
    54717001004
    [8] Palaeosyops
    Last Modified in 12/05/13
    611011009004
    [9] Lambdotherium
    Last Modified in 12/05/13
    112112103004
    [10] Isectolophus
    Last Modified in 12/05/13
    229292011004
    [11] Homogalax
    Last Modified in 12/05/13
    611111108004
    [12] Cardiolophus
    Last Modified in 12/05/13
    21989806004
    [13] Orientolophus
    Last Modified in 12/05/13
    68575700004
    [14] Cymbalophus
    Last Modified in 12/05/13
    39868501004
    [15] Systemodon
    Last Modified in 12/05/13
    33919101004
    [16] Sifrhippus
    Last Modified in 12/05/13
    1810710601004
    [17] Arenahippus grangeri
    Last Modified in 12/05/13
    212212201004
    [18] Xenicohippus craspedotum
    Last Modified in 12/05/13
    2210210201004
    [19] Xenicohippus grangeri
    Last Modified in 12/05/13
    34919100004
    [20] Xenicohippus osborni
    Last Modified in 12/05/13
    112312301004
    [21] Pliolophus vulpiceps
    Last Modified in 12/05/13
    1510910901004
    [22] Protorohippus montanum
    Last Modified in 12/05/13
    1710810701004
    [23] Protorohippus venticolum
    Last Modified in 12/05/13
    112312301004
    [24] Orohippus major
    Last Modified in 12/05/13
    33919101004
    [25] Orohippus pumilus
    Last Modified in 12/05/13
    112112103004
    [26] Epihippus
    Last Modified in 12/05/13
    1510710703004
    [27] Triplopus
    Last Modified in 12/05/13
    8100100017004
    [28] Hyrachyus
    Last Modified in 12/05/13
    1106106018004
    [29] Protapirus
    Last Modified in 12/05/13
    169292017004
    [30] Helaletes
    Last Modified in 12/05/13
    248989012004
    [31] Heptodon
    Last Modified in 12/05/13
    4109109012004
    [32] Eomoropus
    Last Modified in 12/05/13
    1810010007004
    [33] Lophiaspis
    Last Modified in 12/05/13
    44767605004
    [34] Lophiodon
    Last Modified in 12/05/13
    298484012004
    [35] Pachynolophus
    Last Modified in 12/05/13
    911611501004
    [36] Propachynolophus
    Last Modified in 12/05/13
    29969600004
    [37] Lophiotherium
    Last Modified in 12/05/13
    33909002004
    [38] Propalaeotherium
    Last Modified in 12/05/13
    112512301004
    [39] Plagiolophus
    Last Modified in 12/05/13
    511811802004
    [40] Anchilophus
    Last Modified in 12/05/13
    55676703004
    [41] Palaeotherium
    Last Modified in 12/05/13
    012312302004
    [42] Mesolambdolophus
    Last Modified in 12/05/13
    95303000004


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views26598
    Project overview2957
    Taxon list10242
    Bibliography729
    Matrix views1576Matrix landing page (1358 views); Matrix from Froehlich (1999) with Mesolamdolophus added and corrections made by Holbrook and LaPergola (2011). (218 views);
    Documents list1168
    Views for media list2197
    Media views5844Media search (3406 views); M92884 (451 views); M93396 (491 views); M93399 (488 views); M93400 (517 views); M93398 (491 views);
    Specimen list1885




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project303
    Project downloads273
    Document downloads2Copyright permission from SVP (2 downloads);
    Matrix downloads28Matrix from Froehlich (1999) with Mesolamdolophus added and corrections made by Holbrook and LaPergola (2011). (28 downloads);