Project 5557: X. Ma, G. D. Edgecombe, D. A. Legg, X. Hou. 2014. The morphology and phylogenetic position of the Cambrian lobopodian Diania cactiformis. Journal of Systematic Palaeontology. 12 (4):445-457.
Specimen: † Anomalocaris (unvouchered)
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Abstract

Cambrian lobopodians have attracted much attention in that they are considered to have close affinities with the origin of arthropods, and recent studies agree that they sample the stem-groups of both Arthropoda and Onychophora. A new lobopodian species, Diania cactiformis Liu et al., 2011, was recently reported from the Chengjiang Lagerst¨atte (southwest China; Cambrian Series 2). This animal was interpreted as bearing arthropod-like articulated appendages and was resolved as the sister taxon to Arthropoda in a cladistic analysis. A reanalysis of the published dataset did not reproduce the phylogenetic placement of D. cactiformis, and the interpretation of its appendage morphology is controversial. New observations on D. cactiformis are made using newly collected material, rejecting the evidence for sclerotized, segmented and articulated appendages; instead the appendages compare more closely to lobopods. The criteria for defining arthropodized appendages are further discussed through comparative studies among fossil lobopodians, anomalocaridids and arthropods. Our study challenges the previous description of anteroposterior orientation, terminal claws and trunk tagmosis as expressed by differentiated anterior and posterior appendages. A synthesis of four recent datasets for lobopodians and stem-group arthropods is used to revisit the phylogeny of stem arthropods. Irrespective of how characters are weighted, D. cactiformis is resolved at a much more basal position to arthropods, indicating that the morphology of this animal’s appendages does not fundamentally inform on the evolution of arthropodization.


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Article DOI: 10.1080/14772019.2013.770418

Project DOI: 10.7934/P5557, http://dx.doi.org/10.7934/P5557
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 2 Documents
  • 27 Taxa
  • 1 Specimen
  • 42 Characters
Total size of project's media files: 541.7k

Download Project SDD File
Total scored cells: 1076
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 42
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 88
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:42/0
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MorphoBank Project 5557
  • Creation Date:
    14 October 2024
  • Publication Date:
    19 December 2024

    Authors' Institutions

    • Natural History Museum, London

    • Imperial College London

    • Yunnan University



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Brian Ike
    Project Administrator
    271142001076
    (812, 0, 264)
    000


    Taxonomic Overview for Matrix 'M30240' (27 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
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    [1] Priapulida
    Taxon name last Modified on 10/28/24
    01919023001
    [2] † Paucipodia
    Taxon name last Modified on 10/14/24
    03030012001
    [3] † Microdictyon
    Taxon name last Modified on 10/28/24
    03131011001
    [4] † Cardiodictyon
    Taxon name last Modified on 10/14/24
    13131010001
    [5] † Onychodictyon
    Taxon name last Modified on 10/14/24
    32727012001
    [6] † Hallucigenia
    Taxon name last Modified on 10/28/24
    03232010001
    [7] † Luolishania
    Taxon name last Modified on 10/14/24
    03232010001
    [8] † Megadictyon
    Taxon name last Modified on 10/14/24
    3313108001
    [9] † Jianshanopodia
    Taxon name last Modified on 10/28/24
    4303008001
    [10] † Diania
    Taxon name last Modified on 10/28/24
    22929011001
    [11] † Antennacanthopodia
    Taxon name last Modified on 10/28/24
    03131011001
    [12] † Aysheaia
    Taxon name last Modified on 10/28/24
    0343408001
    [13] † Collinsovermis monstruosus
    Taxon name last Modified on 10/14/24
    52727010001
    [14] † Xenusion
    Taxon name last Modified on 10/28/24
    12929012001
    [15] † Hadranax
    Taxon name last Modified on 10/14/24
    92323010001
    [16] † Orstenotubulus
    Taxon name last Modified on 10/14/24
    17181807001
    [17] † Siberion
    Taxon name last Modified on 10/14/24
    2313109001
    [18] † Kerygmachela
    Taxon name last Modified on 10/14/24
    2353505001
    [19] † Pambdelurion
    Taxon name last Modified on 10/28/24
    6323204001
    [20] † Opabinia
    Taxon name last Modified on 10/14/24
    2363604001
    [21] † Anomalocaris
    Taxon name last Modified on 10/28/24
    03131011001
    [22] † Schinderhannes
    Taxon name last Modified on 10/14/24
    0343408001
    [23] † Fuxianhuia
    Taxon name last Modified on 10/14/24
    12929012001
    [24] † Eoredlichia
    Taxon name last Modified on 10/14/24
    03131011001
    [25] † Leanchoilia
    Taxon name last Modified on 10/14/24
    0333309001
    [26] Onychophora
    Taxon name last Modified on 10/28/24
    0343408001
    [27] Tardigrada
    Taxon name last Modified on 10/28/24
    03232010001