Project 586: J. C. Lamsdell. 2013. Redescription of Drepanopterus pentlandicus Laurie 1892, the earliest known hibbertopteroid (Chelicerata : Eurypterida) from the early Silurian (Llandovery) of the Pentland Hills, Scotland. Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 103:77–103.
Specimen: † Drepanopterus pentlandicus (NMS:G.1897.32.91)

Abstract

Drepanopterus pentlandicus Laurie, 1892 is redescribed from the original type material along with previously unfigured specimens. A cleft metastoma is confirmed as a characteristic of the genus along with the armature of the second and third prosomal appendages being modified into flattened blades, while the species is shown to possess an enlarged second tergite and prosomal posterolateral lobes. Different ontogenetic stages of D. pentlandicus are described and it is revealed that these latter characters develop only later in ontogeny, suggesting that described specimens of Drepanopterus abonensis Simpson, 1951 may represent juveniles. Cladistic analysis of Stylonurina shows the genus Drepanopterus is monophyletic and consists of D. pentlandicus, D. abonensis and D. odontospathus sp. nov., and forms a basal clade of mycteropoids. Hibbertopteroidea Kjellesvig-Waering, 1959 is shown to be a junior subjective synonym of Mycteropoidea Cope, 1886, with the synonymy of many of the hibbertopterid genera hypothesised and Hibbertopterus Kjellesvig-Waering, 1959 suggested to represent juvenile specimens of Cyrtoctenus Størmer & Waterston, 1968. Hibbertopterus permianus Ponomarenko, 1985 is transferred to Campylocephalus Eichwald, 1860. The role of heterochrony in the morphological development of the mycteropoid lineage is discussed, with both hibbertopterids and mycteropids being hypertrophic and pre displacement peramorphs respectively that lie along peramorphoclines.


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Project DOI: 10.7934/P586, http://dx.doi.org/10.7934/P586
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 36 Taxa
  • 1 Specimen
  • 80 Characters
Total size of project's media files: 3 MB

Download Project SDD File
Total scored cells: 2120
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 80
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 162
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:80/0
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MorphoBank Project 586


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    James Lamsdell
    Project Administrator
    Last logged in 05/02/13
    361180002120
    (1958, 0, 162)
    000


    Taxonomic Overview for Matrix 'M1535' (36 Taxa)

    taxon unscored
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    cells
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    [1] † Weinbergina opitzi
    Last Modified in 12/05/13
    0717109001
    [2] † Alkenopterus brevitelson
    Last Modified in 12/05/13
    19565605001
    [3] † Brachyopterella pentagonalis
    Last Modified in 12/05/13
    23505007001
    [4] † Brachyopterus stubblefieldi
    Last Modified in 12/05/13
    11626207001
    [5] † Ctenopterus cestrotus
    Last Modified in 12/05/13
    15595906001
    [6] † Cyrtoctenus wittebergensis
    Last Modified in 12/05/13
    19616100001
    [7] † Drepanopterus abonensis
    Last Modified in 12/05/13
    1727207001
    [8] † Stoermeropterus conicus
    Last Modified in 12/05/13
    1747405001
    [9] † Drepanopterus pentlandicus
    Last Modified in 12/05/13
    9656506001
    [10] † Hallipterus excelsior
    Last Modified in 12/05/13
    45333302001
    [11] † Hardieopterus macrophthalmus
    Last Modified in 12/05/13
    12636305001
    [12] † Hibbertopterus scouleri
    Last Modified in 12/05/13
    7696904001
    [13] † Kiaeropterus cyclophthalmus
    Last Modified in 12/05/13
    29464605001
    [14] † Kokomopterus longicaudatus
    Last Modified in 12/05/13
    12636305001
    [15] † Lamontopterus knoxae
    Last Modified in 12/05/13
    32454503001
    [16] † Laurieipterus elegans
    Last Modified in 12/05/13
    10646406001
    [17] † Megarachne servinei
    Last Modified in 12/05/13
    34424204001
    [18] † Moselopterus ancylotelson
    Last Modified in 12/05/13
    4717105001
    [19] † Mycterops mathieui
    Last Modified in 12/05/13
    55242401001
    [20] † Pagea sturrocki
    Last Modified in 12/05/13
    7666607001
    [21] † Parastylonurus ornatus
    Last Modified in 12/05/13
    1727207001
    [22] † Rhenopterus diensti
    Last Modified in 12/05/13
    07070010001
    [23] † Stylonurella spinipes
    Last Modified in 12/05/13
    13606007001
    [24] † Stylonurus powriensis
    Last Modified in 12/05/13
    21545405001
    [25] † Tarsopterella scotica
    Last Modified in 12/05/13
    33454502001
    [26] † Vinetopterus struvei
    Last Modified in 12/05/13
    23555502001
    [27] † Woodwardopterus scabrosus
    Last Modified in 12/05/13
    27474706001
    [28] † Eurypterus remipes
    Last Modified in 12/05/13
    0747406001
    [29] † Hughmilleria socialis
    Last Modified in 12/05/13
    0767604001
    [30] † Onychopterella augusti
    Last Modified in 12/05/13
    14626204001
    [31] † Pagea plotnicki
    Last Modified in 12/05/13
    24525204001
    [32] † Leiopterella tetliei
    Last Modified in 12/05/13
    38393903001
    [33] † Pagea symondsii
    Last Modified in 12/05/13
    49282803001
    [34] † Drepanopterus odontospathus
    Last Modified in 12/05/13
    52282800001
    [35] † Campylocephalus oculatus
    Last Modified in 12/05/13
    54262600001
    [36] † Hastimima whitei
    Last Modified in 12/05/13
    66141400001


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    Specimen list1914
    Taxon list8998
    Bibliography409
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    Matrix downloads6Revised stylonurine phylogeny with further focus on Mycteropoidea (6 downloads);