Project 3167: J. C. Mallon, D. C. Brinkman. 2018. Basilemys morrinensis, a new species of nanhsiungchelyid turtle from the Horseshoe Canyon Formation (Upper Cretaceous) of Alberta, Canada. Journal of Vertebrate Paleontology. 38 (2):none yet.
Specimen: † Basilemys gaffneyi (usnm/paleobiology:v11084)
View: shell

Abstract

We describe a new species of nanhsiungchelyid turtle, Basilemys morrinensis, based on a nearly complete shell from the Horsethief Member (lower Maastrichtian) of the Horseshoe Canyon Formation of Alberta. The species is intermediate in age between the Campanian forms B. variolosa and B. gaffneyi and the upper Maastrichtian forms B. sinuosa and B. praeclara. It is also intermediate in its morphology, possessing a unique suite of both plesiomorphic (e.g., divided extragulars) and derived (e.g., square epiplastral beak, pygal wider than long) traits. It is further characterized by an autapomorphic square cervical scale. Phylogenetic analysis assuming parsimony recovers B. morrinensis in a polytomy with B. variolosa and B. gaffneyi, outside the clade formed by the upper Maastrichtian forms B. sinuosa and B. praeclara. The holotype of Basilemys morrinensis provides the first evidence that this genus reached large size (?1 m long) in the Horseshoe Canyon Formation and was not diminutive as previously thought based on less complete shell material. Although Basilemys is usually regarded as terrestrial in habit based on its skull and limb morphology, we note that the low profile of its shell is a derived feature usually indicative of an aquatic mode of life. This suggests that there is yet much to learn about the life habits of this interesting turtle.


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Article DOI: 10.1080/02724634.2018.1431922

Project DOI: 10.7934/P3167, http://dx.doi.org/10.7934/P3167
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 15 Taxa
  • 2 Specimens
  • 47 Characters
Total size of project's media files: 2 MB

Download Project SDD File
Total scored cells: 440
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 47
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 98
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:47/0
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MorphoBank Project 3167
  • Creation Date:
    08 May 2018
  • Publication Date:
    11 May 2018
  • Project views: 2092


    Members

    member name taxa specimens media chars character
    media
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    cell scorings
    (scored, NPA, "-")
    cell
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    Tanya Berardini
    Project Administrator
    Last logged in 05/11/18
    15214700440
    (440, 0, 0)
    000
    MorphoBank Curator
    Full membership
    Last logged in 05/23/18
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M25408' (15 Taxa)

    taxon unscored
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    [1] † Adocus sp.
    Last Modified in 05/09/18
    1464600002
    [2] † Zangerlia testudinimorph
    Last Modified in 05/09/18
    26212100002
    [3] † 'Zangerlia' neimongolensis
    Last Modified in 05/09/18
    3444400002
    [4] † 'Zangerlia' ukhaachelys
    Last Modified in 05/09/18
    25222200002
    [5] † Basilemys variolosa
    Last Modified in 05/09/18
    4454300002
    [6] † Basilemys gaffneyi
    Last Modified in 05/09/18
    15343200002
    [7] † Basilemys sinuosa
    Last Modified in 05/09/18
    18292900002
    [8] † Basilemys praeclara
    Last Modified in 05/09/18
    26212100002
    [9] † Hanbogdemys orientalis
    Last Modified in 05/09/18
    12353500002
    [10] † Anomalochelys angulata
    Last Modified in 05/09/18
    29181800002
    [11] † Nanhsiungchelys wuchingensis
    Last Modified in 05/09/18
    14333300002
    [12] † Kharakhutulia kalandadzei
    Last Modified in 05/09/18
    24232300002
    [13] † Jianxichelys ganzhouensis
    Last Modified in 05/09/18
    28191900002
    [14] † 'Zangerlia' dzamynchondi
    Last Modified in 05/09/18
    25222200002
    [15] † Basilemys morrinensis
    Last Modified in 05/09/18
    19282800002


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    Project overview257
    Media views436Media search (356 views); M508408 (80 views);
    Matrix views226Matrix landing page (185 views); Mallon Brinkman nexus file (41 views);
    Bibliography98
    Taxon list684
    Specimen list241
    Views for media list150




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