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Taxonomy
Isotelus was named by Dekay (1824). Its type is Asaphus (Isotelus) gigas.
It was reranked as Asaphus (Isotelus) by M'Coy (1849) and Owen (1852).
It was assigned to Asaphus by M'Coy (1849) and Owen (1852); to Asaphinae by Phleger (1933) and Whittington (1941); to Isotelinae by Henningsmoen (1960) and Owen (1981); to Asaphida by Sepkoski (2002); and to Asaphidae by Jell and Adrain (2002), Owens and Fortey (2009) and Kanygin et al. (2019).
It was reranked as Asaphus (Isotelus) by M'Coy (1849) and Owen (1852).
It was assigned to Asaphus by M'Coy (1849) and Owen (1852); to Asaphinae by Phleger (1933) and Whittington (1941); to Isotelinae by Henningsmoen (1960) and Owen (1981); to Asaphida by Sepkoski (2002); and to Asaphidae by Jell and Adrain (2002), Owens and Fortey (2009) and Kanygin et al. (2019).
Species
Homotelus catactus, Homotelus elongatus, Homotelus florencevillensis, Homotelus gratiosus, Homotelus indentus, Homotelus laevis, Homotelus laeviurus, Homotelus stegops, Homotelus stincharensis, Homotelus ulrichi, I. aktchokensis, I. bradleyi, I. copenhagenensis, I. frognoensis, I. giganteus, I. gigas, I. harrisi (syn. I. platymarginatus), I. iowensis, I. kimmswickensis, I. maximus, I. megistos, I. parvirugosus, I. platyrhachis, I. rejuvenis, I. rex, I. simplex, I. skapaneidos, I. susae, I. violaensis, I. walcotti (syn. I. planus)
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1824 | Isotelus Dekay |
| 1849 | Asaphus (Isotelus) M'Coy p. 399 |
| 1852 | Asaphus (Isotelus) Owen |
| 1920 | Homotelus Raymond |
| 1933 | Isotelus Phleger, Jr. p. 18 |
| 1941 | Isotelus Whittington p. 512 |
| 1950 | Homotelus Begg p. 288 |
| 1960 | Isotelus Henningsmoen |
| 1981 | Isotelus Owen |
| 2002 | Isotelus Jell and Adrain p. 389 |
| 2002 | Homotelus Sepkoski |
| 2002 | Isotelus Sepkoski |
| 2009 | Isotelus Owens and Fortey |
| 2019 | Isotellus Kanygin 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. †Isotelus Dekay 1824
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†Isotelus aktchokensis Weber 1948
†Isotelus bradleyi Amati 2014
†Isotelus copenhagenensis Ross and Shaw 1972
†Isotelus frognoensis Owen 1981
†Isotelus giganteus Raymond 1931
†Isotelus gigas Dekay 1824
†Isotelus iowensis Owen 1852
†Isotelus kimmswickensis Bradley 1930
†Isotelus maximus Locke 1838
†Isotelus megistos Locke 1842
†Isotelus parvirugosus Chatterton and Ludvigsen 1976
†Isotelus platyrhachis Steinhardt 1874
†Isotelus rejuvenis Raymond 1920
†Isotelus rex Rudkin et al. 2003
†Isotelus simplex Raymond and Narraway 1910
†Isotelus skapaneidos Amati 2014
†Isotelus susae Whitfield 1882
†Isotelus violaensis Amati 2014
Invalid names: Homotelus Raymond 1920 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class | |||||
| References: Hendy 2009, Hendy et al. 2009, Aberhan et al. 2004 | |||||
Collections (1063 total)
Oldest occurrences | |||
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ibexian | USA (Nevada) | I. sp. (104308) | |
| Ordovician | United Kingdom | I. spp. (182520) | |
| Ordovician | USA (New York) | I. sp. (332) | |
| Ordovician | USA (Tennessee) | I. sp. (1959) | |
| Dawan | China (Hunan and Hubei) | I. sp. (7717) | |
| Arenig | China (Sichuan) | I. sp. (7679) | |
| Arenig | China (Hunan) | I. sp. (7693) | |
| Middle Ordovician | USA (Kentucky) | I. sp. (124619) | |
| Middle Ordovician | USA (New York) | I. gigas (181523 181524) I. simplex (23122) I. sp. (333 334 335 430) | |
| Middle Ordovician | USA (Tennessee) | I. sp. (319) | |
Youngest occurrences |
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| Time interval | Ma | Country or state | PBDB collection number |
| Richmondian | USA (Nevada) | I. sp. (78051) | |
| Richmondian - Ashgill | USA (Ohio) | I. sp. (392 393 394) | |
| Ashgill - Richmondian | Canada (Ontario) | I. maximus (26303) | |
| Pusgillian - Rawtheyan | Norway (Ringerike) | I. sp., I. frognoensis (163026) | |
| Ashgill | USA (Nevada) | I. sp. (359) | |
| Ashgill | Canada (Quebec) | I. sp. b (13131) | |
| Ashgill | USA (Indiana) | I. gigas, I. maximus (64224 64225 64230 64232) | |
| Ashgill | USA (Kentucky) | I. maximus (24034) | |
| Hirnantian | United Kingdom (Scotland) | I. sp. (181875 181876) | |
| Aeronian - Telychian | USA (Georgia) | I. brachycephalus (164677) | |