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Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Xenelasmatinae
Taxonomy
Xenelasmatinae was named by Ulrich and Cooper (1936). Its type is Xenelasma.
It was assigned to Syntrophiidae by Williams et al. (2002).
It was assigned to Syntrophiidae by Williams et al. (2002).
Subtaxa
Synonymy list
Year | Name and author |
---|---|
1936 | Xenelasmatinae Ulrich and Cooper |
2002 | Xenelasmatinae Williams et al. p. 935 |
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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.
Subfm. †Xenelasmatinae Ulrich and Cooper 1936
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G. †Rhyselasma
G. †Rosella Andreeva 1972
G. †Xenelasma
G. †Xenelasmella
G. †Xenelasmopsis
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 |
Age range: base of the Whiterockian to the top of the Arenigian or 471.80000 to 468.10000 Ma
Collections (7 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Early/Lower Ordovician | USA (Texas) | Xenelasma sp. (293) | |
Canadian | USA (Maryland) | Xenelasma sp. (428) | |
Jeffersonian | USA (Texas) | Xenelasma synthrophioides (80088) | |
Arenigian | Russian Federation | Rosella karakulensis (37813) | |
Floian | Russian Federation (Siberia) | Rhyselasma sp. (9292) | |
Whiterockian | USA (Nevada) | Xenelasma sp. (104469) | |
Dapingian | Russian Federation (Siberia) | Rhyselasma sp. (9293) |