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 - Project views: 6384
- 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 Last Modified in 11/03/21 | 3 | 66 | 66 | 0 | 31 | 0 | 0 | 3 |
[2] † Aphelaspis australis Last Modified in 11/03/21 | 31 | 45 | 45 | 0 | 24 | 0 | 0 | 3 |
[3] † Andrarina costata Last Modified in 11/03/21 | 10 | 57 | 57 | 0 | 33 | 0 | 0 | 3 |
[4] † Pterocephalia norfordi Last Modified in 11/03/21 | 1 | 67 | 67 | 0 | 32 | 0 | 0 | 3 |
[5] † Strigambitus transversus Last Modified in 11/03/21 | 20 | 58 | 56 | 0 | 24 | 0 | 0 | 3 |
[6] † Prehousia diverta Last Modified in 11/03/21 | 22 | 50 | 50 | 0 | 28 | 0 | 0 | 3 |
[7] † Olenus gibbosus Last Modified in 11/03/21 | 3 | 70 | 70 | 0 | 27 | 0 | 0 | 3 |
[8] † Parabolina Neoparabolina frequens argentina Last Modified in 11/03/21 | 5 | 70 | 70 | 0 | 25 | 0 | 0 | 3 |
[9] † Parabolinella argentinensis Last Modified in 11/03/21 | 2 | 69 | 69 | 0 | 29 | 0 | 0 | 3 |
[10] † Jujuyaspis keideli Last Modified in 11/03/21 | 4 | 57 | 56 | 0 | 40 | 0 | 0 | 3 |
[11] † Plicatolina scalpta Last Modified in 11/03/21 | 9 | 70 | 69 | 0 | 22 | 0 | 0 | 3 |
[12] † Bienvillia parchaensis Last Modified in 11/03/21 | 2 | 64 | 64 | 0 | 34 | 0 | 0 | 3 |
[13] † Hypermecaspis armata Last Modified in 11/03/21 | 1 | 70 | 70 | 0 | 29 | 0 | 0 | 3 |
[14] † Hypermecaspis inermis Last Modified in 11/03/21 | 2 | 70 | 70 | 0 | 28 | 0 | 0 | 3 |
[15] † Hypermecaspis chamarrensis Last Modified in 11/03/21 | 8 | 62 | 62 | 0 | 30 | 0 | 0 | 3 |
[16] † Hypermecaspis occidentalis Last Modified in 11/03/21 | 29 | 51 | 51 | 0 | 20 | 0 | 0 | 3 |
[17] † Hypermecaspis edselbrussai Last Modified in 11/03/21 | 10 | 63 | 63 | 0 | 27 | 0 | 0 | 3 |
[18] † Hypermecaspis latigena Last Modified in 11/03/21 | 21 | 56 | 56 | 0 | 23 | 0 | 0 | 3 |
[19] † Hypermecaspis brevifrons Last Modified in 11/03/21 | 22 | 53 | 53 | 0 | 25 | 0 | 0 | 3 |
[20] † Hypermecaspis venulosa Last Modified in 11/03/21 | 24 | 53 | 53 | 0 | 23 | 0 | 0 | 3 |
[21] † Hypermecaspis rugosa Last Modified in 11/03/21 | 49 | 39 | 39 | 0 | 12 | 0 | 0 | 3 |
[22] † Hypermecaspis venerabilis Last Modified in 11/03/21 | 21 | 56 | 56 | 0 | 23 | 0 | 0 | 3 |
[23] † Hypermecaspis kolouros Last Modified in 11/03/21 | 31 | 46 | 46 | 0 | 23 | 0 | 0 | 3 |
[24] † Hypermecaspis alveus Last Modified in 11/03/21 | 21 | 56 | 56 | 0 | 23 | 0 | 0 | 3 |
[25] † Tropidopyge broeggeri Last Modified in 11/03/21 | 82 | 10 | 10 | 0 | 8 | 0 | 0 | 3 |
[26] † Hypermecaspis mimitis Last Modified in 11/03/21 | 24 | 56 | 56 | 0 | 20 | 0 | 0 | 3 |
[27] † Hypermecaspis bulmani Last Modified in 11/03/21 | 36 | 47 | 47 | 0 | 17 | 0 | 0 | 3 |
[28] † Hypermecaspis branisai Last Modified in 11/03/21 | 6 | 65 | 65 | 0 | 29 | 0 | 0 | 3 |
[29] † Hypermecaspis cf bulmani Last Modified in 11/03/21 | 37 | 45 | 45 | 0 | 18 | 0 | 0 | 3 |
[30] † Hypermecaspis asiatica Last Modified in 11/03/21 | 38 | 42 | 42 | 0 | 20 | 0 | 0 | 3 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 6384 | |
Project overview | 701 | |
Bibliography | 248 | |
Matrix views | 365 | Matrix landing page (335 views); Hypermecaspididae (30 views); |
Media views | 1258 | Media search (1074 views); M834684 (184 views); |
Views for media list | 350 | |
Documents list | 361 | |
Specimen list | 1130 | |
Taxon list | 1971 |
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); |