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Isophragma
Taxonomy
Isophragma was named by Cooper (1956). Its type is Isophragma ricevillense.
It was assigned to Isopiiragmatinae by Mitchell (1977); to Strophomenida by Sepkoski (2002); and to Taphrodontinae by Williams et al. (2000), Liljeroth et al. (2017).
It was assigned to Isopiiragmatinae by Mitchell (1977); to Strophomenida by Sepkoski (2002); and to Taphrodontinae by Williams et al. (2000), Liljeroth et al. (2017).
Species
I. extensum, I. orientale, I. parallelum, I. ponderosum, I. pseudoretroflexum, I. ricevillense (type species), I. subabbreviatum
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Isophragma Cooper |
| 1977 | Isophragma Mitchell |
| 2000 | Isophragma Williams et al. p. 309 |
| 2002 | Isophragma Sepkoski |
| 2017 | Isophragma Liljeroth et al. |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Isophragma Cooper 1956
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†Isophragma extensum Cooper 1956
†Isophragma extensum tricostatum Williams 1962
†Isophragma orientale Andreeva 1985
†Isophragma parallelum Liljeroth et al. 2017
†Isophragma ponderosum Cooper 1956
†Isophragma pseudoretroflexum Reed 1917
†Isophragma ricevillense Cooper 1956
†Isophragma subabbreviatum Cooper 1956
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Collections (28 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Dapingian - Darriwilian | Russian Federation (Siberia) | I. extensum (205562) | |
| Middle Ordovician | USA (Tennessee) | I. sp. (319) | |
| Chazyan | USA (Alabama) | I. sp. 1 (162364) | |
| Chazyan | USA (Tennessee) | I. extensum (186138) I. extensum, I. subabbreviatum (164884) | |
| Whiterockian | USA (Nevada) | I. sp. (80081) | |
| Darriwilian | USA (Virginia) | I. biseptatum (186614) | |
| Darriwilian | Russian Federation (Siberia) | I. orientale (206166) I. sp., I. extensum (205561) | |
| Llanvirn | Russian Federation (Tyva) | I. orientale (185993) | |
| Llandeilo | Mongolia | I. extensum (45985) | |
| Llandeilo | United Kingdom (Scotland) | I. extensum (164928 164937 164941) | |
| Costonian | United Kingdom (Scotland) | I. extensum (76076) | |
| Aurelucian | Ireland | I. parallelum (188891 188928) | |
| Caradoc | Kazakhstan | I. imperator (80261) | |
| Mohawkian | USA (Nevada) | I. ponderosum (186188 186189) | |
| Rocklandian - Kirkfieldian | United Kingdom (Northern Ireland) | I. pseudoretroflexum (89157) | |
| Wildernessian | Canada (Northwest Territories) | I. sp. (26951) | |
| Burrellian | United Kingdom (Scotland) | I. pseudoretroflexum (165043 165046 165048) | |
| Katian | Russian Federation (Siberia) | I. extensum (205626) I. ricevillense (205628) | |
| Cheneyan | United Kingdom (Scotland) | I. pseudoretroflexum (219884) |