Project 3533: J. Luque, R.M. Feldmann, O. Vernygora, C.E. Schweitzer, C.B. Cameron, K.A. Kerr, F.J. Vega, A. Duque, M. Strange, A.R. Palmer, C. Jaramillo. 2019. Exceptional preservation of mid-Cretaceous marine arthropods and the evolution of novel forms via heterochrony. Science Advances. 5 (4):eaav3875.
Specimen: † Callichimaera (MUN-STRI :27044-02)
View: two specimens

Abstract

Evolutionary origins of novel forms are often obscure because early and transitional fossils tend to be rare, poorly preserved, or lack proper phylogenetic contexts. We describe a new, exceptionally preserved enigmatic crab from the mid-Cretaceous of Colombia and the United States, whose completeness illuminates the early disparity of the group and the origins of novel forms. Its large and unprotected compound eyes, small fusiform body, and leg-like mouthparts suggest larval trait retention into adulthood via heterochronic development (pedomorphosis), while its large oar-like legs represent the earliest known adaptations in crabs for active swimming. Our phylogenetic analyses, including representatives of all major lineages of fossil and extant crabs, challenge conventional views of their evolution by revealing multiple convergent losses of a typical “crab-like” body plan since the Early Cretaceous. These parallel morphological transformations may be associated with repeated invasions of novel environments, including the pelagic/necto-benthic zone in this pedomorphic chimera crab.


Read the article »

Article DOI: 10.1126/sciadv.aav3875

Project DOI: 10.7934/P3533, http://dx.doi.org/10.7934/P3533
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 42 Taxa
  • 1 Specimen
  • 85 Characters
Total size of project's media files: 5 MB

Download Project SDD File
Total scored cells: 2988
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 85
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 170
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:85/0
Currently Viewing:
MorphoBank Project 3533


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Jo Wolfe
    Project Administrator
    Last logged in 09/17/19
    421185002988
    (2832, 0, 156)
    000
    Javier Luque
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M26241' (42 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] Astacidea
    Last Modified in 09/17/19
    07474011002
    [2] † Platykotta
    Last Modified in 09/17/19
    52323201002
    [3] Blepharipoda
    Last Modified in 09/17/19
    07272013002
    [4] Galathea
    Last Modified in 09/17/19
    07474011002
    [5] Chirostylus
    Last Modified in 09/17/19
    146161010002
    [6] † Callichimaera
    Last Modified in 09/17/19
    12696904002
    [7] Homolodromiidae
    Last Modified in 09/17/19
    2828201002
    [8] † Goniodromitidae
    Last Modified in 09/17/19
    51373301002
    [9] † Prosopidae
    Last Modified in 09/17/19
    53313101002
    [10] † Tanidromitidae
    Last Modified in 09/17/19
    59252501002
    [11] † Glaessneropsidae
    Last Modified in 09/17/19
    60242401002
    [12] † Konidromitidae
    Last Modified in 09/17/19
    60232302002
    [13] Dromiidae
    Last Modified in 09/17/19
    0888302002
    [14] Dynomenidae
    Last Modified in 09/17/19
    0878302002
    [15] † Sphaerodromiidae
    Last Modified in 09/17/19
    0878302002
    [16] † Diaulacidae
    Last Modified in 09/17/19
    22616003002
    [17] † Xandarocarcinidae
    Last Modified in 09/17/19
    24565605002
    [18] † Basinotopidae
    Last Modified in 09/17/19
    14696902002
    [19] Homolidae
    Last Modified in 09/17/19
    2858201002
    [20] Latreilliidae
    Last Modified in 09/17/19
    2818102002
    [21] Poupiniidae
    Last Modified in 09/17/19
    2818102002
    [22] † Mithracitidae
    Last Modified in 09/17/19
    26605801002
    [23] † Etyidae
    Last Modified in 09/17/19
    9747303002
    [24] † Feldmannidae
    Last Modified in 09/17/19
    12727003002
    [25] † Dakoticancridae
    Last Modified in 09/17/19
    8787403002
    [26] † Ibericancridae
    Last Modified in 09/17/19
    9737303002
    [27] Lyreididae
    Last Modified in 09/17/19
    0848302002
    [28] Raninidae
    Last Modified in 09/17/19
    0838104002
    [29] † Camarocarcinidae
    Last Modified in 09/17/19
    27575701002
    [30] † Cenomanocarcinidae
    Last Modified in 09/17/19
    6777702002
    [31] † Necrocarcinidae
    Last Modified in 09/17/19
    11727202002
    [32] † Orithopsidae
    Last Modified in 09/17/19
    22616102002
    [33] † Palaeocorystidae
    Last Modified in 09/17/19
    7807602002
    [34] Cyclodorippidae
    Last Modified in 09/17/19
    0858203002
    [35] Cymonomidae
    Last Modified in 09/17/19
    0838104002
    [36] Phyllotymolinidae
    Last Modified in 09/17/19
    0848203002
    [37] † Torynommidae
    Last Modified in 09/17/19
    22606003002
    [38] † Componocancridae
    Last Modified in 09/17/19
    22585706002
    [39] † Goniochelidae
    Last Modified in 09/17/19
    19606006002
    [40] Carcinidae
    Last Modified in 09/17/19
    0777708002
    [41] Corystidae
    Last Modified in 09/17/19
    0797708002
    [42] Varunidae
    Last Modified in 09/17/19
    0767609002


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views254
    Project overview83
    Matrix views24Matrix landing page (16 views); Exceptional preservation of mid-Cretaceous marine arthropods and the evolution of novel forms via heterochrony (8 views);
    Media views42Media search (36 views); M676392 (6 views);
    Views for media list11
    Specimen list15
    Taxon list70
    Bibliography9




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project6
    Project downloads4
    Matrix downloads2Exceptional preservation of mid-Cretaceous marine arthropods and the evolution of novel forms via heterochrony (2 downloads);