Project 4112: D. S. Monti, M. F. Tortello, V. A. Confalonieri, J. Álvaro. 2022. A phylogenetic approach to the study of the evolution of Hypermecaspididae (Olenida, Trilobita). Papers in Palaeontology. 8 (3):null.
Abstract
Hypermecaspidinae (Trilobita; Olenidae) constitutes a monophyletic clade but its internal relationships are unknown and its phylogenetic position with respect to the rest of Olenida has been recently questioned. In order to propose a phylogenetic hypothesis and to resolve the status of the group, a cladistic analysis of the hypermecaspidinids was performed. One hundred characters (28 quantitative and 72 qualitative) of holaspid morphology were coded for 30 taxa (18 Hypermecaspidinae). Two groups of analysis were performed considering the percentage of missing data. For each group, discrete partition was treated as totally unordered or with some characters that describe intensity, position or shape of certain structures, as ordered. The analyses were performed with TNT using maximum parsimony and implied weighting as optimality criteria. Hypermecaspididae constitutes a monophyletic family within Olenida, sister of pterocephaliids. In the light of the present analysis, an emended diagnosis of the family is provided. The results suggest that “Tropidopyge” broeggeri should be reassigned to Hypermecaspis. Hypermecaspidids would have originated in the late Furongian and rapidly diversified across different parts of the world in the Early Ordovician. With the exception of H. armata and H. chamarrensis, the species of Hypermecaspis exhibit a proportionately large pygidium with a wide doublure and a distinct postaxial field. An evolutionary trend to increase the size of these characters is observed in the genus. The cranidium shows a tendency to enlarge the glabella and the palpebral lobes, together with a narrowing of the interocular genae.Read the article »
Article DOI: 10.1002/spp2.1433
Project DOI: 10.7934/P4112, http://dx.doi.org/10.7934/P4112
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 2430 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 100 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 195 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:71/29 |
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MorphoBank Project 4112
MorphoBank Project 4112
- Creation Date:
03 November 2021 - Publication Date:
22 April 2022 - Matrix downloads: 3
Authors' Institutions
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
- Universidad de Buenos Aires
- Universidad Nacional de la Plata (UNLP)
- Instituto de Ecología Genética y Evolución de Buenos Aires (IEGEBA)
Members
member name | taxa | specimens | media | media notes | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||||||||||
Daniela Monti Project Administrator | 30 | 2 | 1 | 0 | 100 | 50 | 100 | 0 | 0 | 2430 (1683, 0, 747) | 2 | 0 | 0 | 0 | 0 | ||||||||
Viviana Confalonieri Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | 0 | 0 | ||||||||
Franco Tortello Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M27698' (30 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Cedaria minor Taxon name last Modified on 11/03/21 | 3 | 66 | 66 | 0 | 31 | 0 | 0 | 3 |
[2] † Aphelaspis australis Taxon name last Modified on 11/03/21 | 31 | 45 | 45 | 0 | 24 | 0 | 0 | 3 |
[3] † Andrarina costata Taxon name last Modified on 11/03/21 | 10 | 57 | 57 | 0 | 33 | 0 | 0 | 3 |
[4] † Pterocephalia norfordi Taxon name last Modified on 11/03/21 | 1 | 67 | 67 | 0 | 32 | 0 | 0 | 3 |
[5] † Strigambitus transversus Taxon name last Modified on 11/03/21 | 20 | 58 | 56 | 0 | 24 | 0 | 0 | 3 |
[6] † Prehousia diverta Taxon name last Modified on 11/03/21 | 22 | 50 | 50 | 0 | 28 | 0 | 0 | 3 |
[7] † Olenus gibbosus Taxon name last Modified on 11/03/21 | 3 | 70 | 70 | 0 | 27 | 0 | 0 | 3 |
[8] † Parabolina Neoparabolina frequens argentina Taxon name last Modified on 11/03/21 | 5 | 70 | 70 | 0 | 25 | 0 | 0 | 3 |
[9] † Parabolinella argentinensis Taxon name last Modified on 11/03/21 | 2 | 69 | 69 | 0 | 29 | 0 | 0 | 3 |
[10] † Jujuyaspis keideli Taxon name last Modified on 11/03/21 | 4 | 57 | 56 | 0 | 40 | 0 | 0 | 3 |
[11] † Plicatolina scalpta Taxon name last Modified on 11/03/21 | 9 | 70 | 69 | 0 | 22 | 0 | 0 | 3 |
[12] † Bienvillia parchaensis Taxon name last Modified on 11/03/21 | 2 | 64 | 64 | 0 | 34 | 0 | 0 | 3 |
[13] † Hypermecaspis armata Taxon name last Modified on 11/03/21 | 1 | 70 | 70 | 0 | 29 | 0 | 0 | 3 |
[14] † Hypermecaspis inermis Taxon name last Modified on 11/03/21 | 2 | 70 | 70 | 0 | 28 | 0 | 0 | 3 |
[15] † Hypermecaspis chamarrensis Taxon name last Modified on 11/03/21 | 8 | 62 | 62 | 0 | 30 | 0 | 0 | 3 |
[16] † Hypermecaspis occidentalis Taxon name last Modified on 11/03/21 | 29 | 51 | 51 | 0 | 20 | 0 | 0 | 3 |
[17] † Hypermecaspis edselbrussai Taxon name last Modified on 11/03/21 | 10 | 63 | 63 | 0 | 27 | 0 | 0 | 3 |
[18] † Hypermecaspis latigena Taxon name last Modified on 11/03/21 | 21 | 56 | 56 | 0 | 23 | 0 | 0 | 3 |
[19] † Hypermecaspis brevifrons Taxon name last Modified on 11/03/21 | 22 | 53 | 53 | 0 | 25 | 0 | 0 | 3 |
[20] † Hypermecaspis venulosa Taxon name last Modified on 11/03/21 | 24 | 53 | 53 | 0 | 23 | 0 | 0 | 3 |
[21] † Hypermecaspis rugosa Taxon name last Modified on 11/03/21 | 49 | 39 | 39 | 0 | 12 | 0 | 0 | 3 |
[22] † Hypermecaspis venerabilis Taxon name last Modified on 11/03/21 | 21 | 56 | 56 | 0 | 23 | 0 | 0 | 3 |
[23] † Hypermecaspis kolouros Taxon name last Modified on 11/03/21 | 31 | 46 | 46 | 0 | 23 | 0 | 0 | 3 |
[24] † Hypermecaspis alveus Taxon name last Modified on 11/03/21 | 21 | 56 | 56 | 0 | 23 | 0 | 0 | 3 |
[25] † Tropidopyge broeggeri Taxon name last Modified on 11/03/21 | 82 | 10 | 10 | 0 | 8 | 0 | 0 | 3 |
[26] † Hypermecaspis mimitis Taxon name last Modified on 11/03/21 | 24 | 56 | 56 | 0 | 20 | 0 | 0 | 3 |
[27] † Hypermecaspis bulmani Taxon name last Modified on 11/03/21 | 36 | 47 | 47 | 0 | 17 | 0 | 0 | 3 |
[28] † Hypermecaspis branisai Taxon name last Modified on 11/03/21 | 6 | 65 | 65 | 0 | 29 | 0 | 0 | 3 |
[29] † Hypermecaspis cf bulmani Taxon name last Modified on 11/03/21 | 37 | 45 | 45 | 0 | 18 | 0 | 0 | 3 |
[30] † Hypermecaspis asiatica Taxon name last Modified on 11/03/21 | 38 | 42 | 42 | 0 | 20 | 0 | 0 | 3 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 7 | |
Document downloads | 2 | SM1 (1 download); SM5 (1 download); |
Project downloads | 2 | |
Matrix downloads | 3 | Hypermecaspididae (3 downloads); |