Project 2191: J. C. Lamsdell, D. E. G. Briggs, H. P. Liu, B. J. Witzke, R. M. McKay. 2015. A new Ordovician arthropod from the Winneshiek Lagerstätte of Iowa reveals the ground plan of eurypterids and chasmataspidids. Naturwissenschaften: The Science of Nature. 102 (63):1–8.
Specimen: Winneshiekia youngae (SIU:140288)

Abstract

Euchelicerates were a major component of Palaeozoic faunas but their basal relationships are uncertain: it has been suggested that Xiphosura – xiphosurids (horseshoe crabs) and similar Palaeozoic forms, the synziphosurines – may not represent a natural group. Basal euchelicerates are rare in the fossil record, however, particularly during the initial Ordovician radiation of the group. Here, we describe Winneshiekia youngae gen. et sp. nov., a euchelicerate from the Middle Ordovician (Darriwilian) Winneshiek Lagerstätte of Iowa. Winneshiekia shares features with both xiphosurans (a large, semicircular carapace and ophthalmic ridges) and dekatriatan euchelicerates such as chasmataspidids and eurypterids (an opisthosoma of 13 tergites). Phylogenetic analysis resolves Winneshiekia at the base of Dekatriata, sister taxon to a clade comprising chasmataspidids, eurypterids, arachnids, and Houia. Winneshiekia provides further support for the polyphyly of synziphosurines, traditionally considered the stem-lineage to xiphosurid horseshoe crabs, and by extension the paraphyly of Xiphosura. The new taxon reveals the ground pattern of Dekatriata and provides evidence of character polarity in chasmataspidids and eurypterids. The Winneshiek Lagerstätte represents an important window into early chelicerate evolution.


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Article DOI: 10.​1007/​s00114-015-1312-5

Project DOI: 10.7934/P2191, http://dx.doi.org/10.7934/P2191
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 105 Taxa
  • 1 Specimen
  • 216 Characters
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Total scored cells: 17335
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 216
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 531
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Total character states with media with labels:0
Total unordered/ordered characters:216/0
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MorphoBank Project 2191

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    James Lamsdell
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    Last logged in 12/03/15
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    Taxonomic Overview for Matrix 'M23373' (105 Taxa)

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    [1] Fuxianhuia protensa
    Last Modified in 06/12/15
    32135135049001
    [2] Leanchoilia illecebrosa
    Last Modified in 06/12/15
    32149149035001
    [3] Alalcomenaeus cambricus
    Last Modified in 06/12/15
    25156156035001
    [4] Yohoia tenuis
    Last Modified in 06/12/15
    67120120029001
    [5] Emeraldella brocki
    Last Modified in 06/12/15
    18152152046001
    [6] Sydneyia inexpectans
    Last Modified in 06/12/15
    39134134043001
    [7] Olenoides serratus
    Last Modified in 06/12/15
    10166166040001
    [8] Pycnogonum litorale
    Last Modified in 06/12/15
    897970111001
    [9] Haliestes dasos
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    378282097001
    [10] Palaeoisopus problematicus
    Last Modified in 06/12/15
    20110110086001
    [11] Offacolus kingi
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    77115115024001
    [12] Dibasterium durgae
    Last Modified in 06/12/15
    53132132031001
    [13] Anderella parva
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    149636304001
    [14] Weinbergina opitzi
    Last Modified in 06/12/15
    62136136018001
    [15] Camanchia grovensis
    Last Modified in 06/12/15
    140727204001
    [16] Venustulus waukeshaensis
    Last Modified in 06/12/15
    119909007001
    [17] Willwerathia laticeps
    Last Modified in 06/12/15
    140747402001
    [18] Legrandella lombardi
    Last Modified in 06/12/15
    134808002001
    [19] Bembicosoma pomphicus
    Last Modified in 06/12/15
    150646402001
    [20] Bunodes lunula
    Last Modified in 06/12/15
    147656504001
    [21] Limuloides limuloides
    Last Modified in 06/12/15
    143717102001
    [22] Pasternakevia podolica
    Last Modified in 06/12/15
    148666602001
    [23] Cyamocephalus loganensis
    Last Modified in 06/12/15
    144707002001
    [24] Pseudoniscus roosevelti
    Last Modified in 06/12/15
    149656502001
    [25] Euproops anthrax
    Last Modified in 06/12/15
    94101101021001
    [26] Kasibelinurus amoricum
    Last Modified in 06/12/15
    145676704001
    [27] Winneshiekia youngae
    Last Modified in 06/12/15
    147676702001
    [28] Houia yueya
    Last Modified in 06/12/15
    138717107001
    [29] Lunataspis aurora
    Last Modified in 06/12/15
    1406666010001
    [30] Limulus polyphemus
    Last Modified in 06/12/15
    0179179037001
    [31] Paleolimulus signatus
    Last Modified in 06/12/15
    42146146028001
    [32] Stoermeropterus conicus
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    25179179012001
    [33] Moselopterus ancylotelson
    Last Modified in 06/12/15
    24176176016001
    [34] Onychopterella kokomoensis
    Last Modified in 06/12/15
    30174174012001
    [35] Eurypterus tetragonophthalmus
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    8194194014001
    [36] Erieopterus macrophthalmus
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    30172172014001
    [37] Strobilopterus proteus
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    4316516508001
    [38] Dolichopterus macrocheirus
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    22183183011001
    [39] Carcinosoma newlini
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    27174174015001
    [40] Megalograptus ohioensis
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    22180180014001
    [41] Mixopterus kiaeri
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    [42] Orcanopterus manitoulinensis
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    69131131016001
    [43] Adelophthalmus sievertsi
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    46152152018001
    [44] Nanahughmilleria norvegica
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    [45] Hughmilleria socialis
    Last Modified in 06/12/15
    23177177016001
    [46] Slimonia acuminata
    Last Modified in 06/12/15
    24176176016001
    [47] Erettopterus bilobus
    Last Modified in 06/12/15
    24173173019001
    [48] Pterygotus anglicus
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    31166166019001
    [49] Brachyopterus stubblefieldi
    Last Modified in 06/12/15
    66136136014001
    [50] Rhenopterus diensti
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    [51] Parastylonurus ornatus
    Last Modified in 06/12/15
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    [52] Laurieipterus elegans
    Last Modified in 06/12/15
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    [53] Kokomopterus longicaudatus
    Last Modified in 06/12/15
    40163163013001
    [54] Hardieopterus macrophthalmus
    Last Modified in 06/12/15
    71135135010001
    [55] Drepanopterus pentlandicus
    Last Modified in 06/12/15
    26179178012001
    [56] Hibbertopterus scouleri
    Last Modified in 06/12/15
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    [57] Megarachne servinei
    Last Modified in 06/12/15
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    [58] Chasmataspis laurencii
    Last Modified in 06/12/15
    10510210209001
    [59] Loganamaraspis dunlopi
    Last Modified in 06/12/15
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    [60] Achanarraspis reedi
    Last Modified in 06/12/15
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    [61] Heteroaspis stoermeri
    Last Modified in 06/12/15
    140686808001
    [62] Diploaspis casteri
    Last Modified in 06/12/15
    99106106011001
    [63] Diploaspis muelleri
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    141676708001
    [64] Dvulikiaspis menneri
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    [65] Octoberaspis ushakovi
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    [66] Centruroides vittatus
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    [67] Androctonus australis
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    [68] Proscorpius osborni
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    [69] Palaeophonus nuncius
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    [70] Caddo agilis
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    [71] Chileogovea oedipus
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    [72] Cyphophthalmus duricorius
    Last Modified in 06/12/15
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    [73] Gonyleptes horridus
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    [74] Leiobunum rotundum
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    [75] Sclerobunus robustus
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    [76] Allothrombium simoni
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    [77] Amblyomma americanum
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    [78] Neocarus texanus
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    [79] Cryptocellus goodnighti
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    [80] Poliochera punctulata
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    [81] Ricinoides atewa
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    [82] Anthracomartus hindi
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    [83] Eophrynus prestvicii
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    [84] Gilboarachne griersoni
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    [85] Palaeocharinus sp.
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    [86] Mesotarbus peteri
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    [87] Plesiosiro madeleyi
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    [88] Eukoenenia mirabilis
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    3170169044001
    [89] Prokoenenia wheeleri
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    [90] Mastigoproctus giganteus
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    [91] Thelyphonus caudatus
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    [92] Hubbardia pentapeltis
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    [93] Schizomus crassicaudatus
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    [94] Permarachne novokshonovi
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    [95] Attercopus filmbriunguis
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    [96] Liphistius malayanus
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    [97] Aphonopelma hentzi
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    [98] Hypochilus pococki
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    [99] Cupienius getazi
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    [100] Neobisium maritimum
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    [101] Chelifer cancroides
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    [102] Eremocosta striata
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    [103] Galeodes armeniacus
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    [104] Phrynus marginemaculatus
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    3171171042001
    [105] Charinus victori
    Last Modified in 06/12/15
    3171171042001


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    Total project views14383
    Matrix views1281Matrix landing page (1146 views); Phylogenetic analysis of Winneshiekia (135 views);
    Project overview1865
    Media views2232Media search (1939 views); M378310 (293 views);
    Specimen list929
    Bibliography465
    Taxon list7611




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    Matrix downloads4Phylogenetic analysis of Winneshiekia (4 downloads);