Project 4860: T. E. Guensburg, J. Sprinkle, R. Mooi, B. Lefebvre, B. David, M. Roux, K. Derstler. 2020. Athenacrinusn. gen. and other early echinoderm taxa inform crinoid origin and arm evolution. Journal of Paleontology. 94 (2):311-333.
Abstract
Intermediate morphologies of a new fossil crinoid shed light on the pathway by which crinoids acquired their distinctive arms. Apomorphies originating deep in echinoderm history among early nonblastozoan pentaradiate echinoderms distinguish Tremadocian (earliest Ordovician) crinoid arms from later taxa. The brachial series is separated from the ambulacra, part of the axial skeleton, by lateral plate fields. Cover plates are arrayed in two tiers, and floor plates expressed podial basins and pores. Later during the Early Ordovician, floor plates contacted and nestled into brachials, then were unexpressed as stereom elements entirely and cover plates were reduced to a single tier. Incorporation of these events into a parsimony analysis supports crinoid origin deep in echinoderm history separate from blastozoans (eocrinoids, ‘cystoids’). Arm morphology is exceptionally well-preserved in the late Tremadocian to early Floian Athenacrinus broweri new genus new species. Character analysis supports a hypothesis that this taxon originated early within in the disparid clade. Athenacrinus n. gen. (in Athenacrinidae new family) is the earliest-known crinoid to express what is commonly referred to as ‘compound’ or ‘biradial’ morphology. This terminology is misleading in that no evidence for implied fusion or fission of radials exists, rather it is suggested that this condition arose through disproportionate growth.Read the article »
Article DOI: 10.1017/jpa.2019.87
Project DOI: 10.7934/P4860, http://dx.doi.org/10.7934/P4860
This project contains | Matrices |
---|---|
Download Project SDD File | Total scored cells: 693 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 34 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 79 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:34/0 |
Currently Viewing:
MorphoBank Project 4860
MorphoBank Project 4860
- Creation Date:
03 September 2023 - Publication Date:
04 September 2023 - Project views: 2571
- Matrix downloads: 1
Authors' Institutions
- Muséum national d'Histoire naturelle, Paris (Natural History Museum, Paris)
- University Claude Bernard Lyon
- University of New Orleans
- University of Texas at Austin
- California Academy of Sciences
- Field Museum of Natural History
- Université Bourgogne Franche-Comté (UBFC)
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
Shreya Jariwala Project Administrator | 21 | 4 | 4 | 34 | 0 | 0 | 693 (491, 0, 202) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M29469' (21 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Aethocrinus moorei Last Modified in 09/03/23 | 3 | 31 | 31 | 0 | 0 | 0 | 0 | 1 |
[2] † Alphacrinus mansfieldi Last Modified in 09/03/23 | 3 | 31 | 31 | 0 | 0 | 0 | 0 | 1 |
[3] † Apektocrinus ubaghsi Last Modified in 09/03/23 | 0 | 33 | 33 | 0 | 1 | 0 | 0 | 1 |
[4] † Athenacrinus broweri Last Modified in 09/03/23 | 0 | 34 | 34 | 0 | 0 | 0 | 0 | 1 |
[5] † Carabocrinus treadwelli Last Modified in 09/03/23 | 2 | 31 | 31 | 0 | 1 | 0 | 0 | 1 |
[6] † Hybocrinus nitidus Last Modified in 09/03/23 | 0 | 34 | 34 | 0 | 0 | 0 | 0 | 1 |
[7] † Eknomocrinus wahwahensis Last Modified in 09/03/23 | 5 | 29 | 29 | 0 | 0 | 0 | 0 | 1 |
[8] † Glenocrinus globularis Last Modified in 09/03/23 | 5 | 29 | 29 | 0 | 0 | 0 | 0 | 1 |
[9] † Titanocrinus sumralli Last Modified in 09/03/23 | 1 | 33 | 33 | 0 | 0 | 0 | 0 | 1 |
[10] † Stromatocystites pentangularis Last Modified in 09/03/23 | 0 | 17 | 17 | 0 | 17 | 0 | 0 | 1 |
[11] † Kailidiscus chinensis Last Modified in 09/03/23 | 1 | 15 | 15 | 0 | 18 | 0 | 0 | 1 |
[12] † Camptostroma roddyi Last Modified in 09/03/23 | 0 | 19 | 19 | 0 | 15 | 0 | 0 | 1 |
[13] † "Totiglobus" lloydi Last Modified in 09/03/23 | 0 | 16 | 16 | 0 | 18 | 0 | 0 | 1 |
[14] Pseudedriophus guensburgi Last Modified in 09/03/23 | 0 | 17 | 17 | 0 | 17 | 0 | 0 | 1 |
[15] † Kinzercystis durhami Last Modified in 09/03/23 | 0 | 16 | 16 | 0 | 18 | 0 | 0 | 1 |
[16] † Lepidocystis wanneri Last Modified in 09/03/23 | 0 | 16 | 16 | 0 | 18 | 0 | 0 | 1 |
[17] † Gogia kitchnerensis Last Modified in 09/03/23 | 0 | 16 | 16 | 0 | 18 | 0 | 0 | 1 |
[18] † Rhopalocystis destombesi Last Modified in 09/03/23 | 0 | 18 | 18 | 0 | 16 | 0 | 0 | 1 |
[19] † Macrocystella mairae Last Modified in 09/03/23 | 1 | 16 | 16 | 0 | 17 | 0 | 0 | 1 |
[20] † Eumorphocystis multiporata Last Modified in 09/03/23 | 0 | 18 | 18 | 0 | 16 | 0 | 0 | 1 |
[21] † Ceratocystis perneri Last Modified in 09/03/23 | 0 | 22 | 22 | 0 | 12 | 0 | 0 | 1 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 2571 | |
Project overview | 153 | |
Views for media list | 135 | |
Documents list | 101 | |
Bibliography | 86 | |
Media views | 626 | Media search (361 views); M894437 (68 views); M894438 (67 views); M894436 (65 views); M894435 (65 views); |
Taxon list | 893 | |
Specimen list | 477 | |
Matrix views | 100 | Matrix landing page (94 views); Guensberg et al 2020 (6 views); |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 1 | |
Matrix downloads | 1 | Guensberg et al 2020 (1 download); |