Project 4773: D. BERT, S. BERSAC. 2013. Evolutionary patterns-tested with cladistics-and processes in relation to palaeoenvironments of the Upper Barremian genus Gassendiceras (Ammonitina, Lower Cretaceous). Palaeontology. 56 (3):631-646.
Abstract
Phylogenetic reconstruction of the Upper Barremian ammonite genus Gassendiceras (Gassendiceratinae) was performed using a cladistic analysis incorporating continuous data. Some morphological features were found to vary identically among all the analysed species and therefore carry no phylogenetic information (= symplesiomorphic). The single obtained cladogram allows interpreting the evolution of the Gassendiceras as an anagenetic succession of eight species, in stratigraphic order of appearance, Gassendiceras multicostatum, G. alpinum, G. hoheneggeri, G. rebouleti, G. bosellii, G. quelquejeui, G. coulletae and G. enayi. The clade Pseudoshasticrioceras/Imerites is derived from G. enayi, so the genus Gassendiceras appears to be paraphyletic. But here, we accept this fact as the best evolutive classification. The evolution over time of Gassendiceras is modulated by some processes, which could have constrained the inferred phylogenetic pattern with the drift of the global variability towards the most gracile forms over time. It is tempting to interpret this evolution as a constant selection over time of the Gassendiceras modulated by environmental control due to eustatic variation across a transgressive sequence. Thus, the most peramorphic (gracile) individuals seemed favoured at the expense of those most robust (paedomorphic).Read the article »
Article DOI: 10.1111/pala.12007
Project DOI: 10.7934/P4773, http://dx.doi.org/10.7934/P4773
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 93 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 8 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 20 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:8/0 |
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MorphoBank Project 4773
MorphoBank Project 4773
- Creation Date:
25 July 2023 - Publication Date:
28 July 2023 - Project views: 1706
Authors' Institutions
- Laboratory of the research Group for Paleobiology and biostratigraphy of the Ammonites (G.P.A)
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
Joyce Song Project Administrator | 13 | 1 | 1 | 8 | 0 | 0 | 93 (93, 0, 0) | 0 | 0 | 0 | ||||
Brooke Long-Fox Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M29381' (12 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Crioceratites gr. nolani Last Modified in 07/26/23 | 0 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
[2] † Paracrioceras stadtlaenderi Last Modified in 07/26/23 | 1 | 7 | 7 | 0 | 0 | 0 | 0 | 2 |
[3] † Gassendiceras alpinum Last Modified in 07/25/23 | 0 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
[4] † Gassendiceras bosellii Last Modified in 07/25/23 | 0 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
[5] † Gassendiceras coulletae Last Modified in 07/25/23 | 0 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
[6] † Gassendiceras enayi Last Modified in 07/25/23 | 0 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
[7] † Gassendiceras hoheneggeri Last Modified in 07/25/23 | 1 | 7 | 7 | 0 | 0 | 0 | 0 | 2 |
[8] † Gassendiceras multicostatum Last Modified in 07/25/23 | 0 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
[9] † Gassendiceras quelquejeui Last Modified in 07/25/23 | 0 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
[10] † Gassendiceras rebouleti Last Modified in 07/25/23 | 1 | 7 | 7 | 0 | 0 | 0 | 0 | 2 |
[11] † Imerites dichotomus Last Modified in 07/26/23 | 0 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
[12] † Pseudoshasticrioceras magnini Last Modified in 07/25/23 | 0 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
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Taxon list | 396 | |
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Specimen list | 203 | |
Bibliography | 89 |