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Ischnacanthus
Taxonomy
Ischnacanthus was named by Powrie (1864) [Sepkoski's age data: S Prid D Sieg-l Sepkoski's reference number: 455]. It is not extant. Its type is Ischnacanthus gracilis. It is the type genus of Ischnacanthidae. It was considered monophyletic by Voichyshyn and Szaniawski (2012).
It was assigned to Ischnacanthida by Woodward (1891), Sepkoski (2002); to Ischnacanthiformes by Voichyshyn and Szaniawski (2012); and to Ischnacanthidae by Jordan (1963), Denison (1979), van der Laan (2019).
It was assigned to Ischnacanthida by Woodward (1891), Sepkoski (2002); to Ischnacanthiformes by Voichyshyn and Szaniawski (2012); and to Ischnacanthidae by Jordan (1963), Denison (1979), van der Laan (2019).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1864 | Ischnacanthus Powrie |
| 1891 | Ischnacanthus Woodward p. 20 |
| 1963 | Ischnacanthus Jordan p. 591 |
| 1979 | Ischnacanthus Denison |
| 2002 | Ischnacanthus Sepkoski |
| 2012 | Ischnacanthus Voichyshyn and Szaniawski |
| 2019 | Ischnacanthus van der Laan p. 33 |
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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. †Ischnacanthus Powrie 1864
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†Ischnacanthus anglicus White 1961
†Ischnacanthus gracilis Egerton 1861
†Ischnacanthus kingi White 1961
†Ischnacanthus scheii Spjeldnaes 1967
†Ischnacanthus wickhami White 1961
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: c = class, subp = subphylum | |||||
| References: Aberhan et al. 2004, Carroll 1988 | |||||
Age range: base of the Ludfordian to the top of the Emsian or 425.00000 to 393.47000 Ma
Collections (9 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ludfordian | United Kingdom (England) | I. kingi (8314 8320) | |
| Lochkovian | United Kingdom (Scotland) | I. gracilis (155918 195122 195123) I. sp. (26908) | |
| Lochkovian | Canada (Nunavut) | I. sp. (90322) | |
| Early/Lower Devonian | United Kingdom (Scotland) | I. gracilis (181899) | |
| Emsian | USA (Utah) | I. sp. (238200) |