Project 4112: D. S. Monti, M. F. Tortello, V. A. Confalonieri, J. Álvaro. 2022. A phylogenetic approach to the study of the evolution of Hypermecaspididae (Olenida, Trilobita). Papers in Palaeontology. 8 (3):null.
Specimen: † Hypermecaspis armata (Colección Paleontología, Universidad de Buenos Aires/CPBA:4700)
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Abstract

Hypermecaspidinae (Trilobita; Olenidae) constitutes a monophyletic clade but its internal relationships are unknown and its phylogenetic position with respect to the rest of Olenida has been recently questioned. In order to propose a phylogenetic hypothesis and to resolve the status of the group, a cladistic analysis of the hypermecaspidinids was performed. One hundred characters (28 quantitative and 72 qualitative) of holaspid morphology were coded for 30 taxa (18 Hypermecaspidinae). Two groups of analysis were performed considering the percentage of missing data. For each group, discrete partition was treated as totally unordered or with some characters that describe intensity, position or shape of certain structures, as ordered. The analyses were performed with TNT using maximum parsimony and implied weighting as optimality criteria. Hypermecaspididae constitutes a monophyletic family within Olenida, sister of pterocephaliids. In the light of the present analysis, an emended diagnosis of the family is provided. The results suggest that “Tropidopygebroeggeri should be reassigned to Hypermecaspis. Hypermecaspidids would have originated in the late Furongian and rapidly diversified across different parts of the world in the Early Ordovician. With the exception of H. armata and H. chamarrensis, the species of Hypermecaspis exhibit a proportionately large pygidium with a wide doublure and a distinct postaxial field. An evolutionary trend to increase the size of these characters is observed in the genus. The cranidium shows a tendency to enlarge the glabella and the palpebral lobes, together with a narrowing of the interocular genae.


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Article DOI: 10.1002/spp2.1433

Project DOI: 10.7934/P4112, http://dx.doi.org/10.7934/P4112
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 4 Documents
  • 30 Taxa
  • 2 Specimens
  • 100 Characters
Total size of project's media files: 33.32M

Download Project SDD File
Total scored cells: 2430
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 100
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 195
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:71/29
Currently Viewing:
MorphoBank Project 4112
  • Creation Date:
    03 November 2021
  • Publication Date:
    22 April 2022
  • Matrix downloads: 3

    Authors' Institutions

    • Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)

    • Universidad de Buenos Aires

    • Universidad Nacional de la Plata (UNLP)

    • Instituto de Ecología Genética y Evolución de Buenos Aires (IEGEBA)



    Members

    member name taxa specimens media media
    notes
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    Daniela Monti
    Project Administrator
    3021010050100002430
    (1683, 0, 747)
    20000
    Viviana Confalonieri
    Full membership
    0000000000
    (0, 0, 0)
    00000
    Franco Tortello
    Full membership
    0000000000
    (0, 0, 0)
    00000


    Taxonomic Overview for Matrix 'M27698' (30 Taxa)

    taxon unscored
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    [1] † Cedaria minor
    Taxon name last Modified on 11/03/21
    36666031003
    [2] † Aphelaspis australis
    Taxon name last Modified on 11/03/21
    314545024003
    [3] † Andrarina costata
    Taxon name last Modified on 11/03/21
    105757033003
    [4] † Pterocephalia norfordi
    Taxon name last Modified on 11/03/21
    16767032003
    [5] † Strigambitus transversus
    Taxon name last Modified on 11/03/21
    205856024003
    [6] † Prehousia diverta
    Taxon name last Modified on 11/03/21
    225050028003
    [7] † Olenus gibbosus
    Taxon name last Modified on 11/03/21
    37070027003
    [8] † Parabolina Neoparabolina frequens argentina
    Taxon name last Modified on 11/03/21
    57070025003
    [9] † Parabolinella argentinensis
    Taxon name last Modified on 11/03/21
    26969029003
    [10] † Jujuyaspis keideli
    Taxon name last Modified on 11/03/21
    45756040003
    [11] † Plicatolina scalpta
    Taxon name last Modified on 11/03/21
    97069022003
    [12] † Bienvillia parchaensis
    Taxon name last Modified on 11/03/21
    26464034003
    [13] † Hypermecaspis armata
    Taxon name last Modified on 11/03/21
    17070029003
    [14] † Hypermecaspis inermis
    Taxon name last Modified on 11/03/21
    27070028003
    [15] † Hypermecaspis chamarrensis
    Taxon name last Modified on 11/03/21
    86262030003
    [16] † Hypermecaspis occidentalis
    Taxon name last Modified on 11/03/21
    295151020003
    [17] † Hypermecaspis edselbrussai
    Taxon name last Modified on 11/03/21
    106363027003
    [18] † Hypermecaspis latigena
    Taxon name last Modified on 11/03/21
    215656023003
    [19] † Hypermecaspis brevifrons
    Taxon name last Modified on 11/03/21
    225353025003
    [20] † Hypermecaspis venulosa
    Taxon name last Modified on 11/03/21
    245353023003
    [21] † Hypermecaspis rugosa
    Taxon name last Modified on 11/03/21
    493939012003
    [22] † Hypermecaspis venerabilis
    Taxon name last Modified on 11/03/21
    215656023003
    [23] † Hypermecaspis kolouros
    Taxon name last Modified on 11/03/21
    314646023003
    [24] † Hypermecaspis alveus
    Taxon name last Modified on 11/03/21
    215656023003
    [25] † Tropidopyge broeggeri
    Taxon name last Modified on 11/03/21
    82101008003
    [26] † Hypermecaspis mimitis
    Taxon name last Modified on 11/03/21
    245656020003
    [27] † Hypermecaspis bulmani
    Taxon name last Modified on 11/03/21
    364747017003
    [28] † Hypermecaspis branisai
    Taxon name last Modified on 11/03/21
    66565029003
    [29] † Hypermecaspis cf bulmani
    Taxon name last Modified on 11/03/21
    374545018003
    [30] † Hypermecaspis asiatica
    Taxon name last Modified on 11/03/21
    384242020003


    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project7
    Document downloads2SM1 (1 download); SM5 (1 download);
    Project downloads2
    Matrix downloads3Hypermecaspididae (3 downloads);