Project 908: M. A. Wills, R.A. Jenner, C. N. Dhubhghaill. 2009. Eumalacostracan Evolution: Conflict between Three Sources of Data. Arthropod Systematics & Phylogeny. 67 (1):71-90.
Specimen: Mictocaris halope (unvouchered)
View: dorsal

Abstract

There is no consensus on the inter-ordinal relationships of eumalacostracans, despite the recent synthesis of several morphological matrices with data from four molecular markers. Signals from different molecules conflict with each other, and all are conspicuously at odds with morphology. Can fossils help to resolve the problem? Here, we utilize palaeontological data in two ways. Firstly we coded a selection of fossil taxa into our morphological matrix, and assessed their impact upon inferred phylogeny relative to that of their living counterparts (first order jackknifing). This revealed that our morphological tree is very sensitive to the precise taxon sample (a problem that must be addressed in future studies), but that our fossil groups were not disproportionately influential. Secondly, we asked whether the order in which groups appear in the fossil record provides a means to choose between competing trees. The congruence between morphological and stratigraphic signals was extremely weak and non-significant in most cases, precluding the use of fossil dates in this way. Many trees imply ghost ranges of duration near the theoretical maximum, and worse than for the majority of other animal groups so far investigated. An incomplete fossil record and fragile/weakly-supported trees combine with considerable molecular rate heterogeneity to make the Eumalacostraca extremely poorly suited to molecular clock studies. Future insights into their phylogeny are likely to come from the development of new molecular markers, as well as hard-won data on internal anatomy and ultrastructure.


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Project DOI: 10.7934/P908, http://dx.doi.org/10.7934/P908
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 31 Taxa
  • 1 Specimen
  • 177 Characters


Download Project SDD File
Total scored cells: 4529
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 177
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 444
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:177/0
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MorphoBank Project 908


    Members

    member name taxa specimens media media
    notes
    chars character
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    labels
    cell scorings
    (scored, NPA, "-")
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    Jo Wolfe
    Project Administrator
    Last logged in 03/10/14
    311101770004529
    (4202, 0, 327)
    000
    Ronald Jenner
    Full membership
    Last logged in Never
    000000000
    (0, 0, 0)
    000
    Matthew Wills
    Full membership
    Last logged in Never
    000000000
    (0, 0, 0)
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    Taxonomic Overview for Matrix 'M2014' (30 Taxa)

    taxon unscored
    cells
    scored
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    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Acanthotelson
    Last Modified in 12/05/13
    719796010003
    [2] † Aeschronectida
    Last Modified in 12/05/13
    77929208003
    [3] Amphionidacea
    Last Modified in 12/05/13
    4212812807003
    [4] Amphipoda
    Last Modified in 12/05/13
    2164156019003
    [5] Anaspidacea
    Last Modified in 12/05/13
    316616509003
    [6] † Angustidontus
    Last Modified in 12/05/13
    107767000003
    [7] Anostraca
    Last Modified in 12/05/13
    14139137026003
    [8] Bathynellacea
    Last Modified in 12/05/13
    31128126020003
    [9] † Belotelsonidea
    Last Modified in 12/05/13
    99707008003
    [10] Bochusacea
    Last Modified in 12/05/13
    45125118014003
    [11] Brachypoda
    Last Modified in 12/05/13
    22129129026003
    [12] Caridea
    Last Modified in 12/05/13
    017116908003
    [13] Cumacea
    Last Modified in 12/05/13
    1116315907003
    [14] Dendrobranchiata
    Last Modified in 12/05/13
    116816709003
    [15] Euphausiacea
    Last Modified in 12/05/13
    217117005003
    [16] Euzygida
    Last Modified in 12/05/13
    2714414406003
    [17] Isopoda
    Last Modified in 12/05/13
    1167161015003
    [18] Leptostraca
    Last Modified in 12/05/13
    4162161012003
    [19] Lophogastrida
    Last Modified in 12/05/13
    1416116102003
    [20] Mictocaris
    Last Modified in 12/05/13
    37126125015003
    [21] Mysida
    Last Modified in 12/05/13
    118217402003
    [22] Notostraca
    Last Modified in 12/05/13
    21135135021003
    [23] † Palaeocaris
    Last Modified in 12/05/13
    711019808003
    [24] Procaridea
    Last Modified in 12/05/13
    1915415404003
    [25] † Pygocephalomorpha
    Last Modified in 12/05/13
    98777504003
    [26] Reptantia
    Last Modified in 12/05/13
    017316809003
    [27] Spelaeogriphacea
    Last Modified in 12/05/13
    31146133013003
    [28] Stomatopoda
    Last Modified in 12/05/13
    3160159015003
    [29] Tanaidacea
    Last Modified in 12/05/13
    3174164010003
    [30] Thermosbaenacea
    Last Modified in 12/05/13
    13153149015003


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    Total project views16312
    Project overview3000
    Media views4577Media search (3826 views); M326558 (751 views);
    Matrix views2114Matrix landing page (1885 views); Emalacostracan evolution: conflict between three sources of data (229 views);
    Taxon list3616
    Specimen list1936
    Views for media list1069




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    Matrix downloads2Emalacostracan evolution: conflict between three sources of data (2 downloads);
    Project downloads171