Project 537: J. C. Lamsdell,S. J. Braddy,O. E. Tetlie. 2010. The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida). Journal of Systematic Palaeontology. 8 (1):49-61.
Specimen: † Stylonurus powriensis (unvouchered)

Abstract

The first well-resolved phylogeny of stylonurine eurypterids (30 taxa, 58 characters) is presented, prompting a taxonomic revision at the familial and superfamilial levels. The monophyletic suborder Stylonurina consists of four superfamilies: Rhenopteroidea, Stylonuroidea, Kokomopteroidea and Hibbertopteroidea. The enigmatic hibbertopterids – large sweep-feeding forms from the Carboniferous to end-Permian – are therefore demonstrated to be an in-group Stylonurina clade, within Eurypterida, in contrast to some earlier hypotheses. Furthermore, the genus Drepanopterus is shown to be polyphyletic: ‘Drepanopterus’ bembycoides is transferred to Moselopteridae fam. nov. along with Moselopterus and Vinetopterus at the base of the Eurypterina, defined by their possession of a pediform appendage VI bearing a modified podomere 7a. Evolution towards a sweep-feeding mode of life occurred independently in stylonuroids and hibbertopteroids, involving either multiple rows of fixed spines on the prosomal appendages (in stylonuroids) or paired movable flattened spines (‘blades’) on the prosomal appendages alongside a posteriorly cleft metastoma and coxal laden (in hibbertopteroids). The Stylonurina have a relatively poor fossil record (RCI 15%), when compared to more derived Eurypterina clades (e.g. Adelophthalmoidea RCI 66%; Pterygotoidea RCI 53%), but is relatively more complete than basal Eurypterina clades (RCI -21%). The fit between phylogeny and stratigraphical occurrences of stylonurid taxa is good (SCI 0.65 and GER 0.77, with only 0.3% of 1000 randomisation tests yielding greater congruence; GER* 0.995), and generic-level collector curves of the Stylonurina and Eurypterina show no major discrepancies in their sampling histories. These differences could be explained by geographic collection bias, taxa having different habitat preferences (and hence fossilisation potential), and ontogenetic factors: these results support previous suggestions that stylonurine eurypterids are oversplit.


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Project DOI: 10.7934/P537, http://dx.doi.org/10.7934/P537
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 3 Documents
  • 30 Taxa
  • 1 Specimen
  • 58 Characters
Total size of project's media files: 4 MB

Download Project SDD File
Total scored cells: 1290
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 58
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 117
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:58/0
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MorphoBank Project 537


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    MorphoBank Curator
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    Last logged in 02/20/12
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    Maureen Admin
    Full membership
    Last logged in 08/15/11
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    James Lamsdell
    Full membership
    Last logged in 09/05/11
    300158001290
    (1201, 0, 89)
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    Taxonomic Overview for Matrix 'M1219' (30 Taxa)

    taxon unscored
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    scored
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    [1] † Weinbergina opitzi
    Last Modified in 12/05/13
    0525206003
    [2] † Alkenopterus brevitelson
    Last Modified in 12/05/13
    18373703003
    [3] † Brachyopterella pentagonalis
    Last Modified in 12/05/13
    21323205003
    [4] † Brachyopterus stubblefieldi
    Last Modified in 12/05/13
    10444404003
    [5] † Ctenopterus cestrotus
    Last Modified in 12/05/13
    15404003003
    [6] † Cyrtoctenus wittebergensis
    Last Modified in 12/05/13
    18404000003
    [7] † Drepanopterus abonensis
    Last Modified in 12/05/13
    0515107003
    [8] † Drepanopterus? bembycoides
    Last Modified in 12/05/13
    14424202003
    [9] † Drepanopterus pentlandicus
    Last Modified in 12/05/13
    20333305003
    [10] † Hallipterus excelsior
    Last Modified in 12/05/13
    39191900003
    [11] † Hardieopterus macrophthalmus
    Last Modified in 12/05/13
    11444403003
    [12] † Hibbertopterus scouleri
    Last Modified in 12/05/13
    7474704003
    [13] † Kiaeropterus cyclophthalmus
    Last Modified in 12/05/13
    23323203003
    [14] † Kokomopterus longicaudatus
    Last Modified in 12/05/13
    11454502003
    [15] † Lamontopterus knoxae
    Last Modified in 12/05/13
    28282802003
    [16] † Laurieipterus elegans
    Last Modified in 12/05/13
    9464603003
    [17] † Megarachne servinei
    Last Modified in 12/05/13
    27282803003
    [18] † Moselopterus ancylotelson
    Last Modified in 12/05/13
    4525202003
    [19] † Mycterops mathieui
    Last Modified in 12/05/13
    44141400003
    [20] † Pagea sturrocki
    Last Modified in 12/05/13
    11434304003
    [21] † Parastylonurus ornatus
    Last Modified in 12/05/13
    1535304003
    [22] † Rhenopterus diensti
    Last Modified in 12/05/13
    0515107003
    [23] † Stylonurella spinipes
    Last Modified in 12/05/13
    12424204003
    [24] † Stylonurus powriensis
    Last Modified in 12/05/13
    19363603003
    [25] † Tarsopterella scotica
    Last Modified in 12/05/13
    29292900003
    [26] † Vinetopterus struvei
    Last Modified in 12/05/13
    22363600003
    [27] † Woodwardopterus scabrosus
    Last Modified in 12/05/13
    24292905003
    [28] † Eurypterus remipes
    Last Modified in 12/05/13
    0555503003
    [29] † Hughmilleria socialis
    Last Modified in 12/05/13
    0575701003
    [30] † Onychopterella augusti
    Last Modified in 12/05/13
    13444401003


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    Total project views19257
    Project overview2238
    Media views3598Media search (3097 views); M88277 (501 views);
    Matrix views1346Matrix landing page (1141 views); The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida) (205 views);
    Specimen list1923
    Taxon list8487
    Bibliography759
    Documents list906




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    Total downloads from project214
    Document downloads2TNT File (1 download); Nexus file (1 download);
    Matrix downloads6The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida) (6 downloads);
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