Project 806: J. Ortega-Hernández, D. A. Legg, S. J. Braddy. 2013. The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda. Cladistics. 29 (1):15-45.
Specimen: † Glypharthrus simplex (Smithsonian National Museum of Natural History:USANM 98918)
View: dorsal

Abstract

The phylogenetic position of aglaspidids, a problematic group of Lower Palaeozoic arthropods of undetermined affinities, is re-examined in the context of the major Cambrian and Ordovician lamellipedian arthropod groups. A cladistic analysis of ten genera of aglaspidids sensu stricto, six aglaspidid-like arthropods and 42 Palaeozoic arthropod taxa indicates that Xenopoda, Cheloniellida, Aglaspidida sensu lato and Trilobitomorpha form a clade (Artiopoda Hou and Bergström, 1997) nested within the mandibulate stem-lineage, thus discarding previous interpretations of these taxa as part 'of the chelicerate stem-group (Arachnomorpha Heider, 1913). The results confirm an aglaspidid identity for several recently described arthropods, including Quasimodaspis brentsae, Tremaglaspis unite, Chlupacaris dubia, Australaglaspis stonyensis and an unnamed Ordovician Chinese arthropod. The problematic Bohemian arthropod Kodymirus vagans was recovered as sister taxon to Beckwithia typa, and both form a small clade that falls outside Aglaspidida sensu stricto, thus discarding eurypterid affinities for the former. The analysis does not support the phylogenetic position of Kwanyinaspis maotianshanensis at the base of Conciliterga as proposed in recent studies, but rather occupies a basal position within Aglaspidida sensu lato. The results indicate a close association of aglaspidid arthropods with xenopods (i.e. Emeraldella and Sidneyia) and cheloniellids (e.g. Cheloniellon, Duslia); the new clade “Vicissicaudata” is proposed to encompass these arthropods, which are characterized by a differentiated posterior region. The phylogenetic position of aglaspidid arthropods makes them good outgroup candidates for analysing the internal relationships within the groups that form Trilobitomorpha. This work provides a much clearer picture of the phylogenetic relationships among Lower Palaeozoic lamellipedians.


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Project DOI: 10.7934/P806, http://dx.doi.org/10.7934/P806
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 58 Taxa
  • 1 Specimen
  • 82 Characters
Total size of project's media files: 2 MB

Download Project SDD File
Total scored cells: 4076
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 82
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 189
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:82/0
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MorphoBank Project 806


    Members

    member name taxa specimens media chars character
    comms
       
    notes  media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
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    Jo Wolfe
    Project Administrator
    Last logged in 03/21/13
    58118200004076
    (3309, 0, 767)
    000
    MorphoBank Curator
    Full membership
    Last logged in 03/21/13
    000000000
    (0, 0, 0)
    000
    David Legg
    Full membership
    Last logged in 10/18/12
    000000000
    (0, 0, 0)
    000
    Javier Ortega-Hernández
    Full membership
    Last logged in 03/16/13
    000000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M2006' (58 Taxa)

    taxon unscored
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    "-" cellscell images labels on
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    [1] † Fortiforceps
    Last Modified in 12/05/13
    16767014004
    [2] † Haikuocaris
    Last Modified in 12/05/13
    06767015004
    [3] † Aglaspella
    Last Modified in 12/05/13
    20535309004
    [4] † Aglaspis
    Last Modified in 12/05/13
    116060011004
    [5] † Australaglaspis
    Last Modified in 12/05/13
    23505009004
    [6] † Beckwithia
    Last Modified in 12/05/13
    25484809004
    [7] † Buenaspis
    Last Modified in 12/05/13
    234747012004
    [8] † Burgessia
    Last Modified in 12/05/13
    06060022004
    [9] † Cheloniellon
    Last Modified in 12/05/13
    16565016004
    [10] † Chlupacaris
    Last Modified in 12/05/13
    32414109004
    [11] † Chraspedops
    Last Modified in 12/05/13
    23505009004
    [12] † Cindarella
    Last Modified in 12/05/13
    06868014004
    [13] † Cyclopites
    Last Modified in 12/05/13
    21525209004
    [14] † Dicranocaris
    Last Modified in 12/05/13
    25484809004
    [15] † Duslia
    Last Modified in 12/05/13
    25484809004
    [16] † Emeraldella
    Last Modified in 12/05/13
    06767015004
    [17] † Eoredlichia
    Last Modified in 12/05/13
    06969013004
    [18] † Kwanyinaspis
    Last Modified in 12/05/13
    86464010004
    [19] † Eurypterida
    Last Modified in 12/05/13
    06969013004
    [20] † Flobertia
    Last Modified in 12/05/13
    37424203004
    [21] † Glypharthrus simplex
    Last Modified in 12/05/13
    205252010004
    [22] † Alalcomaneus
    Last Modified in 12/05/13
    06868014004
    [23] † Helmetia
    Last Modified in 12/05/13
    195151012004
    [24] † Jianfengia
    Last Modified in 12/05/13
    26565015004
    [25] † Kodymirus
    Last Modified in 12/05/13
    205050012004
    [26] † Kuamaia
    Last Modified in 12/05/13
    36565014004
    [27] † Leanchoilia
    Last Modified in 12/05/13
    16565016004
    [28] † Liwia
    Last Modified in 12/05/13
    204949013004
    [29] † Marrella
    Last Modified in 12/05/13
    15656025004
    [30] † Mimetaster
    Last Modified in 12/05/13
    06262020004
    [31] † Misszhouia
    Last Modified in 12/05/13
    16565016004
    [32] † Naraoia compacta
    Last Modified in 12/05/13
    16565016004
    [33] † Naraoia spinosa
    Last Modified in 12/05/13
    16565016004
    [34] † Neostrabops
    Last Modified in 12/05/13
    38393905004
    [35] † Nettapezoura
    Last Modified in 12/05/13
    195151012004
    [36] † Olenoides
    Last Modified in 12/05/13
    06868014004
    [37] † Pseudoarthron
    Last Modified in 12/05/13
    47333302004
    [38] Pycnogonida
    Last Modified in 12/05/13
    16161020004
    [39] † Quasimodaspis
    Last Modified in 12/05/13
    26474709004
    [40] † Retifacies
    Last Modified in 12/05/13
    16969012004
    [41] † Saperion
    Last Modified in 12/05/13
    45959019004
    [42] † Sidneyia
    Last Modified in 12/05/13
    46767011004
    [43] † Sinoburius
    Last Modified in 12/05/13
    56363014004
    [44] † Skioldia
    Last Modified in 12/05/13
    95454019004
    [45] † Soomaspis
    Last Modified in 12/05/13
    234747012004
    [46] † Tariccoia
    Last Modified in 12/05/13
    234747012004
    [47] † Tegopelte
    Last Modified in 12/05/13
    154848019004
    [48] † Tremaglaspis
    Last Modified in 12/05/13
    215050011004
    [49] † Triopus
    Last Modified in 12/05/13
    244747011004
    [50] † Uarthrus
    Last Modified in 12/05/13
    24494909004
    [51] † Weinbergina
    Last Modified in 12/05/13
    06969013004
    [52] † Xandarella
    Last Modified in 12/05/13
    16767014004
    [53] † Yohoia
    Last Modified in 12/05/13
    06868014004
    [54] † Rebachiella
    Last Modified in 12/05/13
    06464018004
    [55] † Martinssonia
    Last Modified in 12/05/13
    06262020004
    [56] Nebalia
    Last Modified in 12/05/13
    06464018004
    [57] † Chinese arthropod
    Last Modified in 12/05/13
    31424209004
    [58] † Squamacula
    Last Modified in 12/05/13
    06161021004


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