Project 902: G. D. Edgecombe. 1992. Trilobite phylogeny and the Cambrian-Ordovician "event": cladistic reappraisal. Extinction and Phylogeny:144-177.
Specimen: † Physemataspis insularis (NYSM 15066)
View: ventral

Abstract

Cladistic revision of supergeneric taxa of Trilobita has revealed that taxonomic turnover between Cambrian and Ordovician systems is less than was implied by traditional gradistic classifications Taking the late Cambrian "Ptychaspid Biomere" as an exemplar of biomere diversification, taxonomic artifacts (nonmonophyletic groups) have contributed to spurious extinction patterns: cladistic relationships predict ages of origination (sensu Hennig) that may predate biomere boundaries. Calibrating a cladogram for the suborder Asaphina with stratigraphic first appearances, ghost lineages (range extensions inferred from earlier appearance of a sister group) are a substantial component of Cambrian taxon duration Characters from protaspid (larval) morphology afford resolution of the enigmatic relationships of several highly autapomorphic trilobite orders that diversified in the Early Ordovician: the order Phacopida provides a case study. A high degree of taxonomic congruence is afforded between cladograms based on larval and adult characters for phacopide families.


Read the article »

Project DOI: 10.7934/P902, http://dx.doi.org/10.7934/P902
This project containsMatrices
  • 1 Media
  • 2 Matrices
  • 27 Taxa
  • 1 Specimen
  • 65 Characters
Total size of project's media files: 3 MB

Download Project SDD File
Total scored cells: 1143
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 67
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 146
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:67/0
Currently Viewing:
MorphoBank Project 902


    Members

    member name taxa specimens media chars character
    comms
       
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Jo Wolfe
    Project Administrator
    Last logged in 09/18/13
    2711670001143
    (1143, 0, 0)
    000
    MorphoBank Curator
    Last logged in 03/15/18
    00000000
    (0, 0, 0)
    000
    Greg Edgecombe
    Full membership
    Last logged in 07/10/13
    00000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M2000' (14 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Antagminae
    Last Modified in 12/05/13
    0272700002
    [2] † Lonchocephalidae
    Last Modified in 12/05/13
    4232300002
    [3] † Solenopleuropsinae
    Last Modified in 12/05/13
    3242400002
    [4] † Solenopleurinae
    Last Modified in 12/05/13
    6212100002
    [5] † Proetida
    Last Modified in 12/05/13
    0272700002
    [6] † Lichida
    Last Modified in 12/05/13
    0272700002
    [7] † Odontopleurida
    Last Modified in 12/05/13
    0272700002
    [8] † Calymenidae
    Last Modified in 12/05/13
    0272700002
    [9] † Homalonotidae
    Last Modified in 12/05/13
    0272700002
    [10] † Cheiruridae
    Last Modified in 12/05/13
    0272700002
    [11] † Encrinuridae
    Last Modified in 12/05/13
    0272700002
    [12] † Pterygometopidae
    Last Modified in 12/05/13
    0272700002
    [13] † Phacopidae
    Last Modified in 12/05/13
    2252500002
    [14] † Dalmanitacea
    Last Modified in 12/05/13
    4232300002


    Taxonomic Overview for Matrix 'M2001' (21 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Antagminae
    Last Modified in 12/05/13
    0404000002
    [2] † Cliffiidae
    Last Modified in 12/05/13
    12282800002
    [3] † Olenidae
    Last Modified in 12/05/13
    0404000002
    [4] † Lonchocephalidae
    Last Modified in 12/05/13
    0404000002
    [5] † Calymenidae
    Last Modified in 12/05/13
    0404000002
    [6] † Homalonotidae
    Last Modified in 12/05/13
    0404000002
    [7] † Carmonidae
    Last Modified in 12/05/13
    4363600002
    [8] † Eucalymenidae
    Last Modified in 12/05/13
    11292900002
    [9] † Pilekiidae
    Last Modified in 12/05/13
    1393900002
    [10] † Cheiruridae
    Last Modified in 12/05/13
    0404000002
    [11] † Hammatocnemidae
    Last Modified in 12/05/13
    1393900002
    [12] † Pliomerinae
    Last Modified in 12/05/13
    0404000002
    [13] † Encrinuridae
    Last Modified in 12/05/13
    0404000002
    [14] † Diaphanometopinae
    Last Modified in 12/05/13
    9313100002
    [15] † Gyrometopinae
    Last Modified in 12/05/13
    7333300002
    [16] † Prosopiscidae
    Last Modified in 12/05/13
    10303000002
    [17] † Pterygometopidae
    Last Modified in 12/05/13
    0404000002
    [18] † Phacopidae
    Last Modified in 12/05/13
    0404000002
    [19] † Dalmanitacea
    Last Modified in 12/05/13
    0404000002
    [20] † Acastacea
    Last Modified in 12/05/13
    0404000002
    [21] † Actinopeltis
    Last Modified in 12/05/13
    1393900002


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views18569
    Project overview2561
    Media views4409Media search (3840 views); M307687 (569 views);
    Matrix views2070Matrix landing page (1682 views); Protaspid Exoskeletal Characters (200 views); Holaspid Exoskeletal Characters (188 views);
    Views for media list1193
    Taxon list6318
    Specimen list2018




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project233
    Project downloads225
    Media downloads3M307687 (3 downloads);
    Matrix downloads5Protaspid Exoskeletal Characters (3 downloads); Holaspid Exoskeletal Characters (2 downloads);