Project 5328: J.M. Adrain, S.R. Westrop, E. Landing, R. A. Fortey. 2001. Systematics of the Ordovician trilobites Ischyrotoma and Dimeropygiella, with species from the type Ibexian area, western U.S.A. Journal of Paleontology. 75 (5):947-971.
Abstract
Lower Ordovician sections in the type Ibexian area of western Utah contain a considerably more diverse trilobite fauna than has previously been reported. Reinvestigation of these faunas, based on new field sampling, allows a reassessment of the dimer- opygid genera Ischyrotoma Raymond, 1925, and DimeropygiellaRoss, 1951. These taxa have been considered synonyms, but parsimony analysis indicates each is a well supported clade, and they are best recognized as sister genera. The number of species known from Ibex has been doubled, from four to eight, and morphological information is now available for most parts of the exoskeleton. New species include Ischyrotoma juabensis (Juab Formation), I. wahwahensis (Wah Wah Formation), Dimeropygiella fillmorensis(Fillmore Formation), and D. mccormicki (Fillmore Formation). The previously named species Dimeropygiella caudanodosa, D. blanda , and D. ovata are fully revised on the basis of abundant new material. Pseudohystricurus is a paraphyletic group, with species distributed as a basal grade of the Ischyrotoma/Dimeropygiella group.Read the article »
Article DOI: 10.1666/0022-3360(2001)075<0947:SOTOTI>2.0.CO;2
Project DOI: 10.7934/P5328, http://dx.doi.org/10.7934/P5328
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 394 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 25 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 60 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:25/0 |
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MorphoBank Project 5328
MorphoBank Project 5328
- Creation Date:
30 June 2024 - Publication Date:
02 July 2024
This research
supported by
Authors' Institutions
- Natural History Museum, London
- New York State Museum, Albany
- University of Iowa
- University of Oklahoma
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
Shreya Jariwala Project Administrator | 18 | 1 | 1 | 25 | 0 | 0 | 394 (394, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M29930' (18 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Ischyrotoma anataphra Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[2] † Dimeropygiella blanda Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[3] † Dimeropygiella cf. blanda Taxon name last Modified on 06/30/24 | 6 | 19 | 19 | 0 | 0 | 0 | 0 | 1 |
[4] † Ischyrotoma borealis Taxon name last Modified on 06/30/24 | 9 | 16 | 16 | 0 | 0 | 0 | 0 | 1 |
[5] † Dimeropygiella caudanodosa Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[6] † Dimeropygiella fillmorensis Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[7] † Ischyrotoma juabensis Taxon name last Modified on 06/30/24 | 1 | 24 | 24 | 0 | 0 | 0 | 0 | 1 |
[8] † Dimeropygiella mccormicki Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[9] † Pseudohystricurus obesus Taxon name last Modified on 06/30/24 | 6 | 19 | 19 | 0 | 0 | 0 | 0 | 1 |
[10] † Pseudohystricurus orbus Taxon name last Modified on 06/30/24 | 8 | 17 | 17 | 0 | 0 | 0 | 0 | 1 |
[11] † Dimeropygiella ovata Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[12] † Ischyrotoma parallela Taxon name last Modified on 06/30/24 | 10 | 15 | 15 | 0 | 0 | 0 | 0 | 1 |
[13] † Ischyrotoma stubblefieldi Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[14] † Ischyrotoma twenhofeli Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[15] † Ischyrotoma wahwahensis Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[16] † Pseudohystricurus sp. Taxon name last Modified on 06/30/24 | 13 | 12 | 12 | 0 | 0 | 0 | 0 | 1 |
[17] † Ischyrotoma sp. Taxon name last Modified on 06/30/24 | 3 | 22 | 22 | 0 | 0 | 0 | 0 | 1 |
[18] † Parahystricurus smithiae Taxon name last Modified on 06/30/24 | 0 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |