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Taxonomy
Isoxys was named by Walcott (1890) [Sepkoski's age data: Cm Atda-l Cm mMid-u Sepkoski's reference number: 566,781]. Its type is Isoxys chilhoweanus.
It was considered an invalid subgroup of Thylacocephala by Schram (2014).
It was assigned to Arthropoda by Williams et al. (1996), Sepkoski (2002), Bambach et al. (2007) and Briggs et al. (2008); and to Isoxyidae by Lerosey-Aubril et al. (2020).
It was considered an invalid subgroup of Thylacocephala by Schram (2014).
It was assigned to Arthropoda by Williams et al. (1996), Sepkoski (2002), Bambach et al. (2007) and Briggs et al. (2008); and to Isoxyidae by Lerosey-Aubril et al. (2020).
Species
I. auritus, I. chilhoweanus (type species), I. communis, I. curvirostratus, I. longissimus, I. minor, I. paradoxus, I. volucris
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1890 | Isoxys Walcott |
| 1996 | Isoxys Williams et al. p. 950 |
| 2002 | Isoxys Sepkoski |
| 2007 | Isoxys Bambach et al. p. S78 |
| 2008 | Isoxys Briggs et al. p. 251 |
| 2020 | Isoxys Lerosey-Aubril et al. p. 510 |
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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. †Isoxys Walcott 1890
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†Isoxys auritus Jiang 1982
†Isoxys chilhoweanus Walcott 1890
†Isoxys communis Glaessner 1979
†Isoxys curvirostratus Vannier and Chen 2000
†Isoxys longissimus Simonetta and Delle Cave 1975
†Isoxys minor Luo et al. 2008
†Isoxys paradoxus Hou 1987
†Isoxys volucris Williams et al. 1996
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus | |||||
| Reference: Bambach et al. 2007 | |||||
Age range: base of the Atdabanian to the top of the Marjumian or 521.00000 to 497.00000 Ma
Collections (68 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Caerfai | Canada (Northwest Territories) | I. sp. (49080) | |
| Atdabanian | Russian Federation (Sakha Republic (Yakutiya)) | I. zhurensis (10008) | |
| Atdabanian | Australia (South Australia) | I. sp. (97740 97748) | |
| Atdabanian | Greenland (Peary Land) | I. volucris (90574) | |
| Atdabanian | China (Yunnan) | I. auritus (86845 86847 86851 90137 90138 90151 90161 90163 90166) I. auritus, I. paradoxus (86846 90150 90494 90495) I. auritus, I. paradoxus, I. curvirostratus (68083 90165) I. sp. (86929 86930 86933 90126 90135) I. sp., I. auritus (90152) I. sp., I. auritus, I. paradoxus, I. curvirostratus (90164) I. spp., I. auritus, I. paradoxus, I. curvirostratus (10748) | |
| Atdabanian | China (Ercai) | I. spp., I. auritus, I. paradoxus, I. curvirostratus (10747) | |
| Atdabanian | China (Guizhou) | I. paradoxus, I. curvirostratus (86849) | |
| Nangaoian | China (Yunnan) | I. auritus (132328 194150 194162) I. auritus, I. curvirostratus (194140) I. auritus, I. paradoxus (194141 194143 194153 194155) I. auritus, I. paradoxus, I. curvirostratus (132327 132329 132330 194160 194161 194163) | |
| Nangaoian | China (Guizhou) | I. paradoxa (128423) | |
| Nangaoian | China (Hubai) | I. sp. (219687) | |
| Atdabanian - Caerfai | Greenland | I. volueris (9780) | |
| Botomian | Australia (South Australia) | I. glaessneri, I. communis (187498) I. sp. (172620) | |
| Botomian | China (Yunnan) | I. minor (90353 90361 90364 90370) I. sp. (90357) I. wudingensis (90367) | |
| Toyonian | Turkey (Konya) | I. sp. A sensu BENGTSON 1990 (91535) | |
| Delamaran | Canada (British Columbia) | I. acutangulus (84421 84422 84423 84424 84425 84426) I. acutangulus, I. longissimus (84428) | |
| Solvan | Canada (British Columbia) | I. acutangulus (228554 228555) | |
| Middle Cambrian | Canada (British Columbia) | I. sp. (171308) | |
| St Davids | Canada (British Columbia) | I. sp. (122017) | |
| Marjumian | USA (Utah) | I. longissimus (230682) |