Project 2657: L. Ramsköld. 1991. Pattern and process in the evolution of the Odontopleuridae (Trilobita). The Selenopeltinae and Ceratocephalinae. Transactions of the Royal Society of Edinburgh: Earth Sciences. 82 (2):143-181.
Abstract
The systematics of parts of the Odontopleuridae are revised using character analyses tracing homologous structures, and a computerised cladistic analysis. The choice of outgroup is shown to affect the result of the analysis. Several synapomorphies place Selenopeltis, the type genus of the Selenopeltinae Hawle & Corda, 1847 as sister genus to Dicranurus. The latter's close relationship to Miraspis, type genus of the Miraspidinae Richter & Richter, 1917 is confirmed. The Selenopeltinae therefore becomes a senior subjective synonym of the Miraspidinae. The Selenopeltinae includes about 90 of the over 380 named odontopleurid species known to date (excluding accepted synonyms). The Ceratocephalinae is recognised, including about 30 species. The paired, large pygidial border spines present in most odontopleurids are in some species not homologous, and a falsifiable hypothesis is proposed for the homology of the ‘true major border spines’. This structure is the posterior pleural spine of the tenth postcephalic segment in selenopeltines, ceratocephalines and odontopleurines, and in acidaspidines and apianurines it is the serially homologous spine of the eleventh postcephalic segment. The spine belongs to the first pygidial segment in all taxa except ceratocephalines, where it is on the last thoracic segment. The homology in selenopeltines of the progressive restructuring of the cheek border is reviewed, explaining the supramarginal appearance of the genal spine. The presence and homology of the sublobation of L1 in odontopleurids is discussed, and it may be homologous with the sublobation in lichids. The strongly differentiated thoracic segmental lengths (exsag.), with maximum length reached in the anterior part of thorax, and the much reduced length of the posterior segments, are aspects of a single character-complex, uniquely derived within the Selenopeltinae. The ontogenetic origin of the anterior and posterior pleural spines is reviewed. The presence in Ceratocephala of two instars in one meraspid degree is discussed. A cladistic analysis of selenopeltine and ceratocephaline genera does not entirely resolve the topology of the phylogenetic tree of these taxa, but it confirms Selenopeltis as sister taxon to Dicranurus. These two genera belong in a clade also including Miraspis, Selenopeltoides, and Ceratonurus. Two new genera are erected, Ceratocara and Archaeopleura, the latter with type species A. kazakhensis sp. nov.Read the article »
Article DOI: 10.1017/S0263593300007616
Project DOI: 10.7934/P2657, http://dx.doi.org/10.7934/P2657
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 344 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 22 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 54 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:22/0 |
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MorphoBank Project 2657
MorphoBank Project 2657
- Creation Date:
07 April 2017 - Publication Date:
30 August 2018 - Project views: 15634
- Matrix downloads: 8
Authors' Institutions
- Swedish Museum of Natural History (Naturhistoriska riksmuseet) Stockholm
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
Michael Pankowski Project Administrator | 20 | 0 | 0 | 22 | 0 | 0 | 344 (344, 0, 0) | 0 | 0 | 0 | ||||
Thomas Hegna Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M24554' (20 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Ceratocara Last Modified in 04/07/17 | 3 | 19 | 19 | 0 | 0 | 0 | 0 | 2 |
[2] † Ceratocephala Last Modified in 08/06/18 | 0 | 22 | 22 | 0 | 0 | 0 | 0 | 2 |
[3] † Ceratocephalina Last Modified in 04/08/17 | 2 | 20 | 20 | 0 | 0 | 0 | 0 | 2 |
[4] † Ceratonurus Last Modified in 04/08/17 | 1 | 21 | 21 | 0 | 0 | 0 | 0 | 2 |
[5] † Dicranurus Last Modified in 04/08/17 | 0 | 22 | 22 | 0 | 0 | 0 | 0 | 2 |
[6] † Elbaspis Last Modified in 08/06/18 | 17 | 5 | 5 | 0 | 0 | 0 | 0 | 2 |
[7] † Isoprusia Last Modified in 04/08/17 | 2 | 20 | 20 | 0 | 0 | 0 | 0 | 2 |
[8] † Koneprusia Last Modified in 08/06/18 | 18 | 4 | 4 | 0 | 0 | 0 | 0 | 2 |
[9] † Laethoprusia Last Modified in 04/08/17 | 3 | 19 | 19 | 0 | 0 | 0 | 0 | 2 |
[10] † Miraspis Last Modified in 04/08/17 | 0 | 22 | 22 | 0 | 0 | 0 | 0 | 2 |
[11] † Orphanaspis Last Modified in 04/08/17 | 15 | 7 | 7 | 0 | 0 | 0 | 0 | 2 |
[12] † Proceratocephala Last Modified in 04/08/17 | 1 | 21 | 21 | 0 | 0 | 0 | 0 | 2 |
[13] † Selenopeltis Last Modified in 04/08/17 | 0 | 22 | 22 | 0 | 0 | 0 | 0 | 2 |
[14] † Selenopeltoides Last Modified in 04/08/17 | 2 | 20 | 20 | 0 | 0 | 0 | 0 | 2 |
[15] † Hypanc Last Modified in 04/08/17 | 3 | 19 | 19 | 0 | 0 | 0 | 0 | 2 |
[16] † Diacanthaspis Last Modified in 04/08/17 | 0 | 22 | 22 | 0 | 0 | 0 | 0 | 2 |
[17] † Boedaspis Last Modified in 08/06/18 | 0 | 22 | 22 | 0 | 0 | 0 | 0 | 2 |
[18] † Meadowtownella Last Modified in 04/09/17 | 0 | 22 | 22 | 0 | 0 | 0 | 0 | 2 |
[19] † Archaeopleura Last Modified in 04/08/17 | 15 | 7 | 7 | 0 | 0 | 0 | 0 | 2 |
[20] † Lichakephalidae Last Modified in 04/08/17 | 14 | 8 | 8 | 0 | 0 | 0 | 0 | 2 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 15634 | |
Project overview | 1637 | |
Taxon list | 6944 | |
Specimen list | 1512 | |
Views for media list | 953 | |
Bibliography | 650 | |
Media views | 2952 | Media search (2519 views); M585173 (433 views); |
Matrix views | 977 | Matrix landing page (858 views); Odontopleurid trilobites (119 views); |
Documents list | 9 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 165 | |
Project downloads | 157 | |
Matrix downloads | 8 | Odontopleurid trilobites (8 downloads); |