Project 456: Wolfe, J.M., Hegna, T.A. 2013. Testing the phylogenetic position of Cambrian pancrustacean larval fossils by coding ontogenetic stages. Cladistics. 29.
Specimen: † Bredocaris admirabilis instar 6 (unvouchered)
View: lateral

Abstract

The study of ontogeny as an integral part of understanding the pattern of evolution dates back over 200 years, but only recently have ontogenetic data been explicitly incorporated into phylogenetic analyses. Pancrustaceans undergo radical ontogenetic changes. The spectacular upper Cambrian ‘Orsten’ fauna preserves phosphatized fossil larvae, including putative crown-group pancrustaceans with amazingly complete developmental sequences. The putative presence and nature of adult stages remains a source of debate, causing spurious placements in a traditional morphological analysis. We introduce a new coding method where each semaphoront (discrete larval or adult stage) is considered an OTU. This avoids a priori assumptions of heterochrony. Characters and their states are defined to identify changes in morphology throughout ontogeny. Phylogenetic analyses of semaphoronts produced relationships of each Orsten fossil to the crown-group clade expected from morphology shared with extant larvae. Bredocaris is a member of the stem lineage of Thecostraca or (Thecostraca + Copepoda), and Yicaris and Rehbachiella are likely members of the stem lineage of Cephalocarida. These placements rely directly on comparisons between extant and fossil larval character states. The position of Phosphatocopina remains unresolved. This method may have broader applications to other phylogenetic problems which may rely on ontogenetically variable homology statements.


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Project DOI: 10.7934/P456, http://dx.doi.org/10.7934/P456
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 1 Document
  • 148 Taxa
  • 1 Specimen
  • 146 Characters


Download Project SDD File
Total scored cells: 18068
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 146
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 398
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:146/0
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MorphoBank Project 456


    Members

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    Jo Wolfe
    Project Administrator
    Last logged in 08/28/13
    13711013701320011841
    (11093, 1, 747)
    01090053
    Thomas Hegna
    Full membership
    Last logged in 07/19/12
    11000907001986
    (1942, 3, 41)
    0380011


    Taxonomic Overview for Matrix 'M1039' (148 Taxa)

    taxon unscored
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    scored
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    [1] Glomeris marginata adult
    Last Modified in 12/05/13
    158576046002
    [2] † Bredocaris admirabilis instar 1
    Last Modified in 12/05/13
    199090037002
    [3] † Bredocaris admirabilis instar 2
    Last Modified in 12/05/13
    189797031002
    [4] † Bredocaris admirabilis instar 3
    Last Modified in 12/05/13
    29103103014002
    [5] † Bredocaris admirabilis instar 4
    Last Modified in 12/05/13
    20114114012002
    [6] † Bredocaris admirabilis instar 5
    Last Modified in 12/05/13
    21113113012002
    [7] † Bredocaris admirabilis instar 6
    Last Modified in 12/05/13
    15119116012002
    [8] † Hesslandona angustata instar 1
    Last Modified in 12/05/13
    279393026002
    [9] † Hesslandona angustata instar 2
    Last Modified in 12/05/13
    289191027002
    [10] † Hesslandona unisulcata instar 6
    Last Modified in 12/05/13
    21113110012002
    [11] † Klausmuelleria salopensis
    Last Modified in 12/05/13
    388683022002
    [12] † Rehbachiella kinnekullensis a instar 1 (l1a)
    Last Modified in 12/05/13
    396262045002
    [13] † Rehbachiella kinnekullensis a instar 2 (l2a)
    Last Modified in 12/05/13
    168584045002
    [14] † Rehbachiella kinnekullensis a instar 3 (l3a)
    Last Modified in 12/05/13
    615454031002
    [15] † Rehbachiella kinnekullensis a instar 14 (ts10a)
    Last Modified in 12/05/13
    439286011002
    [16] † Rehbachiella kinnekullensis b instar 4 (l4b)
    Last Modified in 12/05/13
    20101101025002
    [17] † Rehbachiella kinnekullensis b instar 8 (ts4b)
    Last Modified in 12/05/13
    20115114011002
    [18] † Rehbachiella kinnekullensis b instar 17 (ts13b)
    Last Modified in 12/05/13
    449177011002
    [19] † Yicaris dianensis instar 1
    Last Modified in 12/05/13
    378888021002
    [20] † Yicaris dianensis instar 2
    Last Modified in 12/05/13
    429291012002
    [21] † Yicaris dianensis instar 3
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    399595012002
    [22] † Yicaris dianensis instar 6
    Last Modified in 12/05/13
    89484809002
    [23] Eubranchipus grubii stage 1
    Last Modified in 12/05/13
    149290040002
    [24] Eubranchipus grubii stage 2
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    10116113020002
    [25] Eubranchipus grubii stage 3
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    [26] Eubranchipus grubii adult
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    [27] Triops cancriformis stage 1
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    129393041002
    [28] Triops cancriformis stage 2
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    15110110021002
    [29] Triops cancriformis stage 3
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    [30] Triops cancriformis stage 4
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    [31] Triops cancriformis stage 5
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    [32] Triops cancriformis adult
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    [33] Argulus japonicus instar 1
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    [34] Argulus japonicus instar 2
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    328482030002
    [35] Argulus japonicus instar 3
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    [36] Argulus japonicus instar 4
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    [37] Argulus japonicus instar 5
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    [38] Argulus japonicus instar 6
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    378079029002
    [39] Argulus japonicus instar 7
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    288885030002
    [40] Hutchinsoniella macracantha instar 1
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    14106106026002
    [41] Hutchinsoniella macracantha instar 2
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    [42] Hutchinsoniella macracantha instar 3
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    [43] Hutchinsoniella macracantha instar 4
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    14119119013002
    [44] Hutchinsoniella macracantha instar 5
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    [45] Hutchinsoniella macracantha instar 6
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    14119119013002
    [46] Hutchinsoniella macracantha instar 7
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    [47] Hutchinsoniella macracantha instar 8
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    [48] Hutchinsoniella macracantha instar 9
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    [49] Hutchinsoniella macracantha instar 10
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    [50] Hutchinsoniella macracantha instar 11
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    14114114018002
    [51] Hutchinsoniella macracantha instar 12
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    14114114018002
    [52] Hutchinsoniella macracantha instar 13
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    14114114018002
    [53] Hutchinsoniella macracantha instar 14
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    14111111021002
    [54] Hutchinsoniella macracantha instar 15
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    [55] Hutchinsoniella macracantha instar 16
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    14111111021002
    [56] Hutchinsoniella macracantha instar 17
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    15110110021002
    [57] Hutchinsoniella macracantha instar 18
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    15111111020002
    [58] Hutchinsoniella macracantha adult
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    11115113020002
    [59] Labidocera aestiva nauplius 1
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    218078045002
    [60] Labidocera aestiva nauplius 2
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    [61] Labidocera aestiva nauplius 3
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    [62] Labidocera aestiva nauplius 4
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    [63] Labidocera aestiva nauplius 5
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    [64] Labidocera aestiva nauplius 6
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    [65] Labidocera aestiva copepodid 1
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    [66] Labidocera aestiva copepodid 2
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    [67] Labidocera aestiva copepodid 3
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    [68] Labidocera aestiva copepodid 4
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    [69] Labidocera aestiva copepodid 5
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    [70] Labidocera aestiva adult
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    [71] Nebalia sp. stage g
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    [72] Nebalia sp. stage i
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    [73] Nebalia brucei adult
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    [74] Orchestia cavimana stage 1
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    [75] Orchestia cavimana stage 2
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    [76] Orchestia cavimana stage 3
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    [77] Orchestia cavimana stage 4
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    [78] Orchestia cavimana stage 5
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    [79] Orchestia cavimana stage 6
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    209392033002
    [80] Orchestia cavimana hatchling
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    [81] Porcellio scaber stage 9
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    [82] Porcellio scaber stage 10
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    [83] Porcellio scaber stage 11
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    [84] Porcellio scaber stage 12
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    [85] Porcellio scaber stage 13
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    [86] Porcellio scaber stage 14
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    [88] Porcellio scaber stage 16
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    [89] Porcellio scaber stage 17
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    [90] Porcellio scaber stage 18
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    [91] Porcellio scaber manca 1
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    199595032002
    [92] Porcellio scaber manca 2
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    [93] Derocheilocaris remanei instar 1
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    [94] Derocheilocaris remanei instar 2
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    [95] Derocheilocaris remanei instar 3
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    [96] Derocheilocaris remanei instar 4
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    [97] Derocheilocaris remanei instar 5
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    [98] Derocheilocaris remanei instar 6
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    [99] Derocheilocaris remanei instar 7
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    [100] Derocheilocaris remanei instar 8
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    22104104020002
    [101] Derocheilocaris remanei instar 9
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    14111110021002
    [102] Vargula hilgendorfii instar 1
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    [103] Vargula hilgendorfii instar 2
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    [104] Vargula hilgendorfii instar 3
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    2111611409002
    [105] Vargula hilgendorfii instar 4
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    [106] Vargula hilgendorfii instar 5
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    1911811609002
    [107] Darwinula stevensoni instar 1
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    [108] Darwinula stevensoni instar 2
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    [109] Darwinula stevensoni instar 3
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    [110] Darwinula stevensoni instar 4
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    [111] Darwinula stevensoni instar 5
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    [112] Darwinula stevensoni instar 6
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    [113] Darwinula stevensoni instar 7
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    [114] Darwinula stevensoni instar 8
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    19114114013002
    [115] Darwinula stevensoni instar 9
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    18115115013002
    [116] Manawa staceyi instar 2
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    [117] Manawa staceyi instar 3
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    427170033002
    [118] Manawa staceyi instar 4
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    [119] Manawa staceyi instar 6
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    3210297012002
    [120] Pleomothra apletocheles nauplius 1
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    [121] Pleomothra apletocheles nauplius 2
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    [122] Pleomothra apletocheles nauplius 3
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    [123] Pleomothra apletocheles nauplius 4
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    [124] Pleomothra apletocheles nauplius 5
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    [125] Pleomothra apletocheles nauplius 6
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    [126] Pleomothra apletocheles nauplius 7
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    [127] Pleomothra apletocheles instar 1
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    [128] Pleomothra apletocheles adult
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    [129] Baccalaureus falsiramus nauplius 1
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    [130] Baccalaureus falsiramus nauplius 2
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    [131] Baccalaureus falsiramus nauplius 3
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    [132] Baccalaureus falsiramus nauplius 4
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    [133] Baccalaureus falsiramus nauplius 5
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    [134] Baccalaureus falsiramus nauplius 6
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    [135] Baccalaureus falsiramus ascothoracid larva
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    [136] Baccalaureus falsiramus adult
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    [137] Lepas anatifera nauplius 1
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    [138] Lepas anatifera nauplius 2
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    [139] Lepas anatifera nauplius 3
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    [140] Lepas anatifera nauplius 4
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    [141] Lepas anatifera nauplius 5
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    [142] Lepas anatifera nauplius 6
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    [143] Lepas anatifera cyprid
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    [144] Sacculina carcini nauplius 1
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    [145] Sacculina carcini nauplius 2
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    [146] Sacculina carcini nauplius 3
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    [147] Sacculina carcini nauplius 4
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    [148] Sacculina carcini cyprid
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    245858064002


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