Project 4764: F. A. Sundberg. 1999. Redescription of Alokistocare subcoronatum (Hall and Whitfield, 1877), the type species of Alokistocare, and the status of Alokistocaridae Resser, 1939B (Ptychopariida: Trilobita, Middle Cambrian). Journal of Paleontology. 73 (6):1126-1143.
Abstract
Alokistocare subcoronatum (Hall and Whitfield, 1877) is the type species of Alokistocare Lorenz, 1906, the nominal genus for the diverse Middle Cambrian Alokistocaridae Resser, 1939b. New collections from the Ehmaniella Biozone contain cranidia, librigenae, hypostomes, rostral plates, thoracic segments, and pygidia, which allow a more complete understanding of the morphological range and character of this important species. Cladistic analyses using this new information about A. subcoronatum suggest that: 1) Ehmaniellidae Sundberg, 1994, is synonymous with Alokistocaridae; 2) Alokistocaridae is a monophylectic clade and not synonymous with Papyriaspididae Whitehouse, 1939; 3) Pseudoalokistocare Sundberg, 1994, is synonymous with Alokistocare ; and 4) Taxa previously assigned to the older “Alokistocare” / Amecephalus group ( Plagiura to Glossopleura biochrons) form a separate clade and should not be included in Alokistocare or the Alokistocaridae. These older species are assigned to Amecephalus Walcott, 1924, which is restricted to the Delamaran Stage. Alokistocaridae as recognized here is restricted to the Marjuman Stage. A morphometric analysis of Alokistocare subcoronatum shows minor but significant differences among collections, indicating population differences. In addition, the cranidium displays both positive and negative allometric growth as well as isometric growth. Allometric growth is present in both meraspid and holaspid stages. The pygidium shows only isometric growth.Read the article »
Article DOI: 10.1017/S0022336000031024
Project DOI: 10.7934/P4764, http://dx.doi.org/10.7934/P4764
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 900 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 50 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 154 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:50/0 |
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MorphoBank Project 4764
MorphoBank Project 4764
- Creation Date:
20 July 2023 - Publication Date:
27 July 2023 - Project views: 2110
Authors' Institutions
- Natural History Museum of Los Angeles County
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
Shreya Jariwala Project Administrator | 19 | 1 | 1 | 50 | 0 | 0 | 900 (900, 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 'M29372' (19 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Ptychoparella cordillerae Last Modified in 07/20/23 | 3 | 48 | 47 | 0 | 0 | 0 | 0 | 2 |
[2] † Eoptychoparia piochensis Last Modified in 07/20/23 | 0 | 50 | 50 | 0 | 0 | 0 | 0 | 2 |
[3] † Pianaspis sors Last Modified in 07/20/23 | 1 | 50 | 49 | 0 | 0 | 0 | 0 | 2 |
[4] † Papyriaspis lanceola Last Modified in 07/20/23 | 0 | 50 | 50 | 0 | 0 | 0 | 0 | 2 |
[5] † Amecephalus idahoense Last Modified in 07/20/23 | 0 | 54 | 50 | 0 | 0 | 0 | 0 | 2 |
[6] † Amecephalus piochensis Last Modified in 07/20/23 | 2 | 48 | 48 | 0 | 0 | 0 | 0 | 2 |
[7] † Amecephalus cleora Last Modified in 07/20/23 | 13 | 37 | 37 | 0 | 0 | 0 | 0 | 2 |
[8] † Amecephalus laticaudum Last Modified in 07/20/23 | 0 | 53 | 50 | 0 | 0 | 0 | 0 | 2 |
[9] † Altiocculus americanus Last Modified in 07/20/23 | 7 | 43 | 43 | 0 | 0 | 0 | 0 | 2 |
[10] † Altiocculus harrisi Last Modified in 07/20/23 | 0 | 51 | 50 | 0 | 0 | 0 | 0 | 2 |
[11] † Altiocculus drumensis Last Modified in 07/20/23 | 7 | 44 | 43 | 0 | 0 | 0 | 0 | 2 |
[12] † Altiocculus concavus Last Modified in 07/20/23 | 6 | 45 | 44 | 0 | 0 | 0 | 0 | 2 |
[13] † Proehmaniella basilica Last Modified in 07/20/23 | 0 | 51 | 50 | 0 | 0 | 0 | 0 | 2 |
[14] † Ehmaniella waptaensis Last Modified in 07/20/23 | 0 | 51 | 50 | 0 | 0 | 0 | 0 | 2 |
[15] † Ehmaniella fronsplanata Last Modified in 07/20/23 | 0 | 57 | 50 | 0 | 0 | 0 | 0 | 2 |
[16] † Elrathiella euthyopsis Last Modified in 07/20/23 | 6 | 44 | 44 | 0 | 0 | 0 | 0 | 2 |
[17] † Alokistocare paranotatum Last Modified in 07/20/23 | 7 | 43 | 43 | 0 | 0 | 0 | 0 | 2 |
[18] † Alokistocare swasii Last Modified in 07/20/23 | 19 | 32 | 31 | 0 | 0 | 0 | 0 | 2 |
[19] † Alokistocare subcoronatum Last Modified in 07/20/23 | 3 | 49 | 47 | 0 | 0 | 0 | 0 | 2 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 2110 | |
Project overview | 222 | |
Documents list | 133 | |
Matrix views | 144 | Matrix landing page (138 views); Sundberg 1999 (6 views); |
Media views | 598 | Media search (461 views); M890388 (137 views); |
Bibliography | 103 | |
Views for media list | 180 | |
Specimen list | 275 | |
Taxon list | 455 |