Project 810: H. Zhang, X.-P. Dong, S. Xiao. 2012. Three head-larvae of Hesslandona angustata (Phosphatocopida, Crustacea) from the Upper Cambrian of western Hunan, South China and the phylogeny of Crustacea. Gondwana Research. 21 (4):1115–1127.
Specimen: † Hesslandona angustata (unvouchered)
View: ventral

Abstract

We describe three head-larvae of the phosphatocopid Hesslandona angustata of ‘Orsten’-type preservation from the Upper Cambrian Bitiao Formation in Wangcun section, western Hunan, South China. The head-larvae are small (around 300 μm long) and bear four pairs of functional limbs, presumably representing the first ontogenetic stage. A comparison with the head-larvae of Vestrogothia spinata from the same locality and horizon indicates that these head-larvae are identical in terms of appendage design. These head-larvae allow further comparison with phosphatocopids from other ontogenetic stages and other localities. We take these two species as representatives of Euphosphatocopida and include their ontogenetic information, combined with other ‘Orsten’-type stem-lineage crustaceans and crown-group crustaceans, into a computer-based cladistic analysis to explore the relationships of early crustaceans. The phylogeny of the Crustacea sensu lato is reconstructed and the autapomorphies of each node on the phylogenetic tree are given. The occurrence and development of the proximal endite (and its derivatives) can be used to trace the evolution of crustaceans. The evolutionary path from the origin of crustaceans to crown-group crustaceans consists of five steps. These steps are (1): the proximal endite occurred but only on the third pair of limbs and only in later larval stages, (2): the proximal endite occurred on the third pair of limbs since the first ontogenetic stage and later also on the second pair of limbs, (3): the proximal endite occurred on all the post-antennular limbs simultaneously since the first ontogenetic stage, (4): the proximal endites on the second and third pairs of limbs were enlarged to form a coxa and (5): the proximal endites on post-mandibular limbs were enlarged to form a coxa in the malacostracan eucrustaceans.


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Project DOI: 10.7934/P810, http://dx.doi.org/10.7934/P810
This project containsMatrices
  • 2 Media
  • 1 Matrix
  • 16 Taxa
  • 1 Specimen
  • 40 Characters
Total size of project's media files: 2 MB

Download Project SDD File
Total scored cells: 581
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 40
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 177
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:40/0
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MorphoBank Project 810


    Members

    member name taxa specimens media media
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    Jo Wolfe
    Project Administrator
    Last logged in 01/24/13
    16120400000581
    (581, 0, 0)
    00000
    Xiping Dong
    Full membership
    Last logged in Never
    0000000000
    (0, 0, 0)
    00000
    Huaqiao Zhang
    Full membership
    Last logged in 11/23/12
    0000000000
    (0, 0, 0)
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    Taxonomic Overview for Matrix 'M1839' (16 Taxa)

    taxon unscored
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    scored
    cells
    no cell
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    NPA
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    "-" cellscell images labels on
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    [1] † Agnostus pisiformis
    Last Modified in 12/05/13
    3373700003
    [2] † Bredocaris admirabilis
    Last Modified in 12/05/13
    1393900003
    [3] † Cambropachycope clarksoni
    Last Modified in 12/05/13
    2383800003
    [4] † Eoredlichia intermedia
    Last Modified in 12/05/13
    2383800003
    [5] Euphausia superba
    Last Modified in 12/05/13
    0404000003
    [6] † Goticaris longispinosa
    Last Modified in 12/05/13
    2383800003
    [7] † Henningsmoenicaris scutula
    Last Modified in 12/05/13
    0404000003
    [8] † Hesslandona angustata
    Last Modified in 12/05/13
    2383800003
    [9] † Klausmuelleria salopensis
    Last Modified in 12/05/13
    14262600003
    [10] † Kunmingella douvillei
    Last Modified in 12/05/13
    4363600003
    [11] † Martinssonia elongata
    Last Modified in 12/05/13
    1393900003
    [12] † Musacaris gerdgeyeri
    Last Modified in 12/05/13
    12282800003
    [13] † Oelandocaris oelandica
    Last Modified in 12/05/13
    0404000003
    [14] † Sandtorpia vestrogothiensis
    Last Modified in 12/05/13
    14262600003
    [15] † Shankouia zhenghei
    Last Modified in 12/05/13
    0404000003
    [16] † Vestrogothia spinata
    Last Modified in 12/05/13
    2383800003


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