Project 463: A. K. Huttenlocker, J.D. Pardo, B.J. Small, J. S. Anderson. 2013. Cranial morphology of recumbirostrans (Lepospondyli) from the Permian of Kansas and Nebraska, and early morphological evolution inferred by micro-computed tomography. Journal of Vertebrate Paleontology. 33 (3):540-552.
Specimen: † Huskerpeton englehorni (UNSM:32144)
View: lateral

Abstract

‘Microsaurs’ (Lepospondyli) were a group of tetrapods whose fossil record spanned the Mississippian–Early Permian, and have sometimes been implicated in the origins of lissamphibians (especially the fossorial caecilians). Although common in the well-sampled Permian deposits of Texas and Oklahoma, little is known of conservative recumbirostran ‘microsaurs’ from more northerly localities (Kansas/Nebraska). Data on a new, well-preserved recumbirostran, Huskerpeton englehorni, gen. et sp. nov., from the Eskridge Formation, Nebraska, reveal affinities to the purported gymnarthrid ‘Euryodus’ bonneri (here moved to a new genus, Proxilodon) from the Speiser Formation, Kansas. High resolution micro-computed tomography reveals important endocranial data, including an ossified ‘supraoccipital’ that is usually absent in gymnarthrids, a dorsal sinus separating the synotic tectum from the dermal skull roof as in ostodolepids, ventral flanges of the frontals articulating directly with the ascending lamina of the sphenethmoid, and tall, ossified ‘pleurosphenoids,’ thereby providing useful comparison with morphologically derived recumbirostrans. A cladistic analysis of 60 taxa and 227 characters recovered a monophyletic clade of Huskerpeton, Proxilodon, and the recently described Tambaroter within a more inclusive clade that includes gymnarthrids and ostodolepids (both nested members of the Recumbirostra and putative outgroups to caecilians). Whereas other lepospondyls (i.e., lysorophians) are abundant in the region, the records of Huskerpeton and Proxilodon reveal that only two ‘microsaur’ genera are adequately known from the lowermost Permian of Kansas/Nebraska and demonstrate similarities between the Eskridge and Speiser faunas. Moreover, these forms may represent the ground plan from which more specialized fossorial forms (gymnarthrids and ostodolepids) evolved.


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Article DOI: https://doi.org/10.1080/02724634.2013.728998

Project DOI: 10.7934/P463, http://dx.doi.org/10.7934/P463
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 61 Taxa
  • 1 Specimen
  • 227 Characters
Total size of project's media files: 126.52k

Download Project SDD File
Total scored cells: 10818
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 227
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 527
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:227/0
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MorphoBank Project 463

    Authors' Institutions

    • University of Calgary

    • University of Washington

    • Denver Museum of Nature and Science



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Adam Huttenlocker
    Project Administrator
    Last logged in 12/17/13
    60002270010818
    (10036, 0, 782)
    000
    Maureen Admin
    Full membership
    Last logged in 01/17/20
    0000000
    (0, 0, 0)
    000
    MorphoBank Curator
    Full membership
    Last logged in 01/14/14
    1110000
    (0, 0, 0)
    000
    Christian Sidor
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M1494' (60 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Acanthostega
    Last Modified in 12/17/13
    222021906004
    [2] † Proterogyrinus
    Last Modified in 12/17/13
    1920820404004
    [3] † Balanerpeton
    Last Modified in 12/17/13
    1221021005004
    [4] † Dendrerpeton
    Last Modified in 12/17/13
    1820520504004
    [5] † Tuditanus
    Last Modified in 12/17/13
    25185185017004
    [6] † Asaphestera
    Last Modified in 12/17/13
    5716416307004
    [7] † Hapsidoparion
    Last Modified in 12/17/13
    61154154012004
    [8] † Saxonerpeton
    Last Modified in 12/17/13
    26186185016004
    [9] † Pantylus
    Last Modified in 12/17/13
    621421308004
    [10] † Cardiocephalus sternbergi
    Last Modified in 12/17/13
    8213713609004
    [11] † Cardiocephalus peabodyi
    Last Modified in 12/17/13
    6815115009004
    [12] † Euryodus primus
    Last Modified in 12/17/13
    51164163013004
    [13] † Euryodus dalyae
    Last Modified in 12/17/13
    59155155013004
    [14] † Pariotichus
    Last Modified in 12/17/13
    140808007004
    [15] † Proxilodon bonneri
    Last Modified in 12/17/13
    135858507004
    [16] † Huskerpeton englehorni
    Last Modified in 12/17/13
    9612412407004
    [17] † Tambaroter
    Last Modified in 12/05/13
    11210710708004
    [18] † Pelodosotis
    Last Modified in 12/17/13
    30188187010004
    [19] † Nannaroter
    Last Modified in 12/05/13
    10411511508004
    [20] † Micraroter
    Last Modified in 12/17/13
    3718518208004
    [21] † Rhynchonkos
    Last Modified in 12/17/13
    3019018908004
    [22] † Eocaecilia
    Last Modified in 12/17/13
    32169168027004
    [23] † Microbrachis
    Last Modified in 12/17/13
    6209208013004
    [24] † Carrolla
    Last Modified in 12/17/13
    87111111029004
    [25] † Batropetes
    Last Modified in 12/17/13
    36177177014004
    [26] † Utaherpeton
    Last Modified in 12/17/13
    96123120011004
    [27] † Stegotretus
    Last Modified in 12/17/13
    4817317108004
    [28] † Sauropleura scalaris
    Last Modified in 12/17/13
    23195194010004
    [29] † Ptyonius
    Last Modified in 12/17/13
    25192191011004
    [30] † Urocordylus
    Last Modified in 12/17/13
    76142141010004
    [31] † Keraterpeton galvani
    Last Modified in 12/17/13
    3818018009004
    [32] † Batrachiderpeton
    Last Modified in 12/17/13
    4218117807004
    [33] † Diceratosaurus
    Last Modified in 12/17/13
    45172172010004
    [34] † Diplocaulus magnicornis
    Last Modified in 12/17/13
    1920119909004
    [35] † Diploceraspis
    Last Modified in 12/17/13
    46171171010004
    [36] † Scincosaurus
    Last Modified in 12/17/13
    35181180012004
    [37] † Brachydectes
    Last Modified in 12/17/13
    7201200020004
    [38] † Adelogyrinus
    Last Modified in 12/17/13
    74141139014004
    [39] † Oestocephalus
    Last Modified in 12/17/13
    17152152058004
    [40] † Phlegethontia
    Last Modified in 12/17/13
    21124123083004
    [41] † Greererpeton
    Last Modified in 12/17/13
    921521107004
    [42] † Seymouria baylorensis
    Last Modified in 12/17/13
    821821504004
    [43] † Limnoscelis
    Last Modified in 12/17/13
    1221121005004
    [44] † Branchiosauridae
    Last Modified in 12/17/13
    5017216908004
    [45] † Micromelerpetontidae
    Last Modified in 12/17/13
    5317316707004
    [46] † Tersomius
    Last Modified in 12/17/13
    8314814103004
    [47] † Ecolsonia
    Last Modified in 12/17/13
    4817717504004
    [48] † Acheloma
    Last Modified in 12/17/13
    8014314304004
    [49] † Eryops
    Last Modified in 12/17/13
    6615615605004
    [50] † Doleserpeton
    Last Modified in 12/17/13
    5617116803004
    [51] Salamanders
    Last Modified in 12/17/13
    6192178043004
    [52] Anura
    Last Modified in 01/14/14
    8176169050004
    [53] † Albanerpetontidae
    Last Modified in 12/17/13
    80120119028004
    [54] † Micropholis
    Last Modified in 12/17/13
    2220720005004
    [55] † Eoscopus
    Last Modified in 12/17/13
    2620019506004
    [56] † Tambachia
    Last Modified in 12/17/13
    7914514404004
    [57] † Triadobatrachus
    Last Modified in 12/17/13
    89109105033004
    [58] † Gerobatrachus
    Last Modified in 12/17/13
    8813513504004
    [59] † Platyrhinops
    Last Modified in 12/17/13
    5316916905004
    [60] † Amphibamus
    Last Modified in 12/17/13
    4717717703004


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views27365
    Project overview3197
    Matrix views2545Matrix landing page (2288 views); Recumbirostran microsaur matrix Rev4 -- 21-Dec 2011 (257 views);
    Media views4560Media search (3966 views); M323535 (594 views);
    Taxon list13019
    Views for media list1176
    Specimen list1966
    Bibliography902




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project278
    Project downloads251
    Matrix downloads25Recumbirostran microsaur matrix Rev4 -- 21-Dec 2011 (25 downloads);
    Media downloads2M323535 (2 downloads);