Project 1049: G. Tanaka, X. Hou, X. Ma, G. D. Edgecombe, N. J. Strausfeld. 2013. Chelicerate neural ground pattern in a Cambrian great appendage arthropod. Nature. 502:365-367.
Specimen: † Alalcomenaeus sp. (YKLP:11076)
View: lateral

Abstract

Preservation of neural tissue in early Cambrian arthropods has recently been demonstrated to a degree that segmental structures of the head can be associated with individual brain neuromeres. This association provides novel data for addressing long-standing controversies about the segmental identities of specialized head appendages in fossil taxa. Here we document neuroanatomy in the head and trunk of a ‘great appendage’ arthropod, Alalcomenaeus sp., from the Chengjiang biota, southwest China, providing the most complete neuroanatomical profile known from a Cambrian animal. Micro-computed tomography reveals a configuration of one optic neuropil separate from a protocerebrum contiguous with four head ganglia, succeeded by eight contiguous ganglia in an eleven-segment trunk. Arrangements of optic neuropils, the brain and ganglia correspond most closely to the nervous system of Chelicerata of all extant arthropods, supporting the assignment of ‘great appendage’ arthropods to the chelicerate total group. The position of the deutocerebral neuromere aligns with the insertion of the great appendage, indicating its deutocerebral innervation and corroborating a homology between the ‘great appendage’ and chelicera indicated by morphological similarities. Alalcomenaeus and Fuxianhuia protensa1 demonstrate that the two main configurations of the brain observed in modern arthropods, those of Chelicerata and Mandibulata, respectively, had evolved by the early Cambrian.


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Project DOI: 10.7934/P1049, http://dx.doi.org/10.7934/P1049
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 3 Documents
  • 41 Taxa
  • 1 Specimen
  • 145 Characters
Total size of project's media files: 2 MB

Download Project SDD File
Total scored cells: 5765
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 145
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 286
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:145/0
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MorphoBank Project 1049


    Members

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    Jo Wolfe
    Project Administrator
    Last logged in 11/06/13
    4100145005765
    (5765, 0, 0)
    000
    Maureen Admin
    Full membership
    Last logged in 11/05/13
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    MorphoBank Curator
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    Last logged in 01/15/14
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    Greg Edgecombe
    Full membership
    Last logged in 11/18/13
    0000000
    (0, 0, 0)
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    Xiaoya Ma
    Full membership
    Last logged in 10/17/13
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    000


    Taxonomic Overview for Matrix 'M2343' (41 Taxa)

    taxon unscored
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    [1] Euperipatoides rowelli
    Last Modified in 12/05/13
    214314300005
    [2] Orthoporus ornatus
    Last Modified in 12/05/13
    214314300005
    [3] Scolopendra polymorpha
    Last Modified in 12/05/13
    214314300005
    [4] Scutigera coleoptrata
    Last Modified in 12/05/13
    214314300005
    [5] Lycythorhychus sp.
    Last Modified in 12/05/13
    1113413400005
    [6] Limulus polyphemus
    Last Modified in 12/05/13
    613913900005
    [7] Hadrurus arizonensis
    Last Modified in 12/05/13
    114414400005
    [8] Eremobates pallipes
    Last Modified in 12/05/13
    014514500005
    [9] Mastigoproctus giganteus
    Last Modified in 12/05/13
    014514500005
    [10] Phrynus marginemaculata
    Last Modified in 12/05/13
    014514500005
    [11] Heptathela kimurai
    Last Modified in 12/05/13
    114414400005
    [12] Cupinennius salei
    Last Modified in 12/05/13
    014514500005
    [13] Triops longicaudatus
    Last Modified in 12/05/13
    114414400005
    [14] Artemia salina
    Last Modified in 12/05/13
    014514500005
    [15] Tigriopus californicus
    Last Modified in 12/05/13
    414114100005
    [16] Godzilliognomus frondosus
    Last Modified in 12/05/13
    414114100005
    [17] Nebalia pugettensis
    Last Modified in 12/05/13
    314214200005
    [18] Ligia occidentalis
    Last Modified in 12/05/13
    114414400005
    [19] Pseudosquilla ciliata
    Last Modified in 12/05/13
    214314300005
    [20] Pandalopsis dispar
    Last Modified in 12/05/13
    114414400005
    [21] Hemigrapsus oregonensis
    Last Modified in 12/05/13
    414114100005
    [22] Ceonobita clypeatus
    Last Modified in 12/05/13
    314214200005
    [23] Astacus fluviatalis
    Last Modified in 12/05/13
    314214200005
    [24] Machilis germanicus
    Last Modified in 12/05/13
    014514500005
    [25] Lepisma saccharina
    Last Modified in 12/05/13
    014514500005
    [26] Potamanthus luteus
    Last Modified in 12/05/13
    014514500005
    [27] Libellula saturata
    Last Modified in 12/05/13
    014514500005
    [28] Aquarius remigis
    Last Modified in 12/05/13
    314214200005
    [29] Schistocerca americana
    Last Modified in 12/05/13
    114414400005
    [30] Anisolabis maritima
    Last Modified in 12/05/13
    214314300005
    [31] Periplaneta americana
    Last Modified in 12/05/13
    014514500005
    [32] Mantis religiosa
    Last Modified in 12/05/13
    014514500005
    [33] Chauliognathus lecontei
    Last Modified in 12/05/13
    314214200005
    [34] Dineutus sublineatus
    Last Modified in 12/05/13
    214314300005
    [35] Thermonectus marmoratus
    Last Modified in 12/05/13
    314214200005
    [36] Apis mellifera
    Last Modified in 12/05/13
    014514500005
    [37] Polistes flavus
    Last Modified in 12/05/13
    014514500005
    [38] Dasymutilla sp.
    Last Modified in 12/05/13
    414114100005
    [39] Macroglossum stellaratum
    Last Modified in 12/05/13
    014514500005
    [40] Drosophila melanogaster
    Last Modified in 12/05/13
    014514500005
    [41] † Alalcomenaeus sp.
    Last Modified in 12/05/13
    109363600005


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views24105
    Project overview2834
    Media views4187Media search (3666 views); M309485 (521 views);
    Documents list1617
    Bibliography758
    Matrix views2058Matrix landing page (1846 views); Chelicerate neural ground pattern in a Cambrian great appendage arthropod (212 views);
    Specimen list1928
    Taxon list9034
    Views for media list1689




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    Total downloads from project211
    Media downloads1M309485 (1 download);
    Matrix downloads7Chelicerate neural ground pattern in a Cambrian great appendage arthropod (7 downloads);
    Project downloads203