Project 806: J. Ortega-Hernández, D. A. Legg, S. J. Braddy. 2013. The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda. Cladistics. 29 (1):15-45.
Abstract
The phylogenetic position of aglaspidids, a problematic group of Lower Palaeozoic arthropods of undetermined affinities, is re-examined in the context of the major Cambrian and Ordovician lamellipedian arthropod groups. A cladistic analysis of ten genera of aglaspidids sensu stricto, six aglaspidid-like arthropods and 42 Palaeozoic arthropod taxa indicates that Xenopoda, Cheloniellida, Aglaspidida sensu lato and Trilobitomorpha form a clade (Artiopoda Hou and Bergström, 1997) nested within the mandibulate stem-lineage, thus discarding previous interpretations of these taxa as part 'of the chelicerate stem-group (Arachnomorpha Heider, 1913). The results confirm an aglaspidid identity for several recently described arthropods, including Quasimodaspis brentsae, Tremaglaspis unite, Chlupacaris dubia, Australaglaspis stonyensis and an unnamed Ordovician Chinese arthropod. The problematic Bohemian arthropod Kodymirus vagans was recovered as sister taxon to Beckwithia typa, and both form a small clade that falls outside Aglaspidida sensu stricto, thus discarding eurypterid affinities for the former. The analysis does not support the phylogenetic position of Kwanyinaspis maotianshanensis at the base of Conciliterga as proposed in recent studies, but rather occupies a basal position within Aglaspidida sensu lato. The results indicate a close association of aglaspidid arthropods with xenopods (i.e. Emeraldella and Sidneyia) and cheloniellids (e.g. Cheloniellon, Duslia); the new clade “Vicissicaudata” is proposed to encompass these arthropods, which are characterized by a differentiated posterior region. The phylogenetic position of aglaspidid arthropods makes them good outgroup candidates for analysing the internal relationships within the groups that form Trilobitomorpha. This work provides a much clearer picture of the phylogenetic relationships among Lower Palaeozoic lamellipedians.Read the article »
Project DOI: 10.7934/P806, http://dx.doi.org/10.7934/P806
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 4076 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 82 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 189 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:82/0 |
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MorphoBank Project 806
MorphoBank Project 806
- Creation Date:
15 October 2012 - Publication Date:
16 March 2013 - Project views: 51537
- Matrix downloads: 12
Authors' Institutions
- University of Cambridge
- University of Bristol
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||||||
Jo Wolfe Project Administrator | 58 | 1 | 1 | 82 | 0 | 0 | 0 | 0 | 4076 (3309, 0, 767) | 0 | 0 | 0 | ||||||
MorphoBank Curator Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | ||||||
David Legg Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | ||||||
Javier Ortega-Hernández Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M2006' (58 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Fortiforceps Last Modified in 12/05/13 | 1 | 67 | 67 | 0 | 14 | 0 | 0 | 4 |
[2] † Haikuocaris Last Modified in 12/05/13 | 0 | 67 | 67 | 0 | 15 | 0 | 0 | 4 |
[3] † Aglaspella Last Modified in 12/05/13 | 20 | 53 | 53 | 0 | 9 | 0 | 0 | 4 |
[4] † Aglaspis Last Modified in 12/05/13 | 11 | 60 | 60 | 0 | 11 | 0 | 0 | 4 |
[5] † Australaglaspis Last Modified in 12/05/13 | 23 | 50 | 50 | 0 | 9 | 0 | 0 | 4 |
[6] † Beckwithia Last Modified in 12/05/13 | 25 | 48 | 48 | 0 | 9 | 0 | 0 | 4 |
[7] † Buenaspis Last Modified in 12/05/13 | 23 | 47 | 47 | 0 | 12 | 0 | 0 | 4 |
[8] † Burgessia Last Modified in 12/05/13 | 0 | 60 | 60 | 0 | 22 | 0 | 0 | 4 |
[9] † Cheloniellon Last Modified in 12/05/13 | 1 | 65 | 65 | 0 | 16 | 0 | 0 | 4 |
[10] † Chlupacaris Last Modified in 12/05/13 | 32 | 41 | 41 | 0 | 9 | 0 | 0 | 4 |
[11] † Chraspedops Last Modified in 12/05/13 | 23 | 50 | 50 | 0 | 9 | 0 | 0 | 4 |
[12] † Cindarella Last Modified in 12/05/13 | 0 | 68 | 68 | 0 | 14 | 0 | 0 | 4 |
[13] † Cyclopites Last Modified in 12/05/13 | 21 | 52 | 52 | 0 | 9 | 0 | 0 | 4 |
[14] † Dicranocaris Last Modified in 12/05/13 | 25 | 48 | 48 | 0 | 9 | 0 | 0 | 4 |
[15] † Duslia Last Modified in 12/05/13 | 25 | 48 | 48 | 0 | 9 | 0 | 0 | 4 |
[16] † Emeraldella Last Modified in 12/05/13 | 0 | 67 | 67 | 0 | 15 | 0 | 0 | 4 |
[17] † Eoredlichia Last Modified in 12/05/13 | 0 | 69 | 69 | 0 | 13 | 0 | 0 | 4 |
[18] † Kwanyinaspis Last Modified in 12/05/13 | 8 | 64 | 64 | 0 | 10 | 0 | 0 | 4 |
[19] † Eurypterida Last Modified in 12/05/13 | 0 | 69 | 69 | 0 | 13 | 0 | 0 | 4 |
[20] † Flobertia Last Modified in 12/05/13 | 37 | 42 | 42 | 0 | 3 | 0 | 0 | 4 |
[21] † Glypharthrus simplex Last Modified in 12/05/13 | 20 | 52 | 52 | 0 | 10 | 0 | 0 | 4 |
[22] † Alalcomaneus Last Modified in 12/05/13 | 0 | 68 | 68 | 0 | 14 | 0 | 0 | 4 |
[23] † Helmetia Last Modified in 12/05/13 | 19 | 51 | 51 | 0 | 12 | 0 | 0 | 4 |
[24] † Jianfengia Last Modified in 12/05/13 | 2 | 65 | 65 | 0 | 15 | 0 | 0 | 4 |
[25] † Kodymirus Last Modified in 12/05/13 | 20 | 50 | 50 | 0 | 12 | 0 | 0 | 4 |
[26] † Kuamaia Last Modified in 12/05/13 | 3 | 65 | 65 | 0 | 14 | 0 | 0 | 4 |
[27] † Leanchoilia Last Modified in 12/05/13 | 1 | 65 | 65 | 0 | 16 | 0 | 0 | 4 |
[28] † Liwia Last Modified in 12/05/13 | 20 | 49 | 49 | 0 | 13 | 0 | 0 | 4 |
[29] † Marrella Last Modified in 12/05/13 | 1 | 56 | 56 | 0 | 25 | 0 | 0 | 4 |
[30] † Mimetaster Last Modified in 12/05/13 | 0 | 62 | 62 | 0 | 20 | 0 | 0 | 4 |
[31] † Misszhouia Last Modified in 12/05/13 | 1 | 65 | 65 | 0 | 16 | 0 | 0 | 4 |
[32] † Naraoia compacta Last Modified in 12/05/13 | 1 | 65 | 65 | 0 | 16 | 0 | 0 | 4 |
[33] † Naraoia spinosa Last Modified in 12/05/13 | 1 | 65 | 65 | 0 | 16 | 0 | 0 | 4 |
[34] † Neostrabops Last Modified in 12/05/13 | 38 | 39 | 39 | 0 | 5 | 0 | 0 | 4 |
[35] † Nettapezoura Last Modified in 12/05/13 | 19 | 51 | 51 | 0 | 12 | 0 | 0 | 4 |
[36] † Olenoides Last Modified in 12/05/13 | 0 | 68 | 68 | 0 | 14 | 0 | 0 | 4 |
[37] † Pseudoarthron Last Modified in 12/05/13 | 47 | 33 | 33 | 0 | 2 | 0 | 0 | 4 |
[38] Pycnogonida Last Modified in 12/05/13 | 1 | 61 | 61 | 0 | 20 | 0 | 0 | 4 |
[39] † Quasimodaspis Last Modified in 12/05/13 | 26 | 47 | 47 | 0 | 9 | 0 | 0 | 4 |
[40] † Retifacies Last Modified in 12/05/13 | 1 | 69 | 69 | 0 | 12 | 0 | 0 | 4 |
[41] † Saperion Last Modified in 12/05/13 | 4 | 59 | 59 | 0 | 19 | 0 | 0 | 4 |
[42] † Sidneyia Last Modified in 12/05/13 | 4 | 67 | 67 | 0 | 11 | 0 | 0 | 4 |
[43] † Sinoburius Last Modified in 12/05/13 | 5 | 63 | 63 | 0 | 14 | 0 | 0 | 4 |
[44] † Skioldia Last Modified in 12/05/13 | 9 | 54 | 54 | 0 | 19 | 0 | 0 | 4 |
[45] † Soomaspis Last Modified in 12/05/13 | 23 | 47 | 47 | 0 | 12 | 0 | 0 | 4 |
[46] † Tariccoia Last Modified in 12/05/13 | 23 | 47 | 47 | 0 | 12 | 0 | 0 | 4 |
[47] † Tegopelte Last Modified in 12/05/13 | 15 | 48 | 48 | 0 | 19 | 0 | 0 | 4 |
[48] † Tremaglaspis Last Modified in 12/05/13 | 21 | 50 | 50 | 0 | 11 | 0 | 0 | 4 |
[49] † Triopus Last Modified in 12/05/13 | 24 | 47 | 47 | 0 | 11 | 0 | 0 | 4 |
[50] † Uarthrus Last Modified in 12/05/13 | 24 | 49 | 49 | 0 | 9 | 0 | 0 | 4 |
[51] † Weinbergina Last Modified in 12/05/13 | 0 | 69 | 69 | 0 | 13 | 0 | 0 | 4 |
[52] † Xandarella Last Modified in 12/05/13 | 1 | 67 | 67 | 0 | 14 | 0 | 0 | 4 |
[53] † Yohoia Last Modified in 12/05/13 | 0 | 68 | 68 | 0 | 14 | 0 | 0 | 4 |
[54] † Rebachiella Last Modified in 12/05/13 | 0 | 64 | 64 | 0 | 18 | 0 | 0 | 4 |
[55] † Martinssonia Last Modified in 12/05/13 | 0 | 62 | 62 | 0 | 20 | 0 | 0 | 4 |
[56] Nebalia Last Modified in 12/05/13 | 0 | 64 | 64 | 0 | 18 | 0 | 0 | 4 |
[57] † Chinese arthropod Last Modified in 12/05/13 | 31 | 42 | 42 | 0 | 9 | 0 | 0 | 4 |
[58] † Squamacula Last Modified in 12/05/13 | 0 | 61 | 61 | 0 | 21 | 0 | 0 | 4 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 51537 | |
Project overview | 4820 | |
Specimen list | 3320 | |
Views for media list | 1866 | |
Taxon list | 30060 | |
Matrix views | 3063 | Matrix landing page (2599 views); The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda (463 views); A revision of the Late Ordovician marellomorph arthropod Furca bohemica from Czech Republic (1 view); |
Media views | 6977 | Media search (5942 views); M193728 (1035 views); |
Bibliography | 1412 | |
Documents list | 19 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 365 | |
Project downloads | 353 | |
Matrix downloads | 12 | The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda (12 downloads); |