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Helodontiformes
Taxonomy
Helodontiformes is an order.
It was assigned to Paraselachimorpha by Nelson (2006); and to Holocephali by Long (2011) and Nelson et al. (2016).
It was assigned to Paraselachimorpha by Nelson (2006); and to Holocephali by Long (2011) and Nelson et al. (2016).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Helodontiformes Nelson p. 43 |
| 2011 | Helodontiformes Long p. 242 |
| 2016 | Helodontiformes Nelson et al. p. 50 |
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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.
Or. †Helodontiformes
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Fm. †Helodontidae
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G. †Helodus Agassiz 1838
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†Helodus angulatus Newberry and Worthen 1866
†Helodus biformis Newberry and Worthen 1866
†Helodus carbonarius Newberry and Worthen 1866
†Helodus coniculus Newberry and Worthen 1866
†Helodus consolidatus Newberry and Worthen 1866
†Helodus crenulatus Newberry and Worthen 1866
†Helodus denshumani Newberry and Worthen 1866
†Helodus denticulatus Newberry and Worthen 1866
†Helodus didymus Agassiz 1843
†Helodus elytra Newberry and Worthen 1866
†Helodus gibberulus Agassiz 1836
†Helodus gibbus Leidy 1857
†Helodus incisus Eastman 1903
†Helodus laevis Newberry 1879
†Helodus limax Newberry and Worthen 1866
†Helodus mammillaris Agassiz 1843
†Helodus planus Agassiz 1843
†Helodus politus Newberry and Worthen 1866
†Helodus rudis M'Coy 1848
†Helodus rugosus Newberry and Worthen 1870
†Helodus simplex Agassiz 1838
†Helodus subpolitus Branson 1916
†Helodus subteres Agassiz 1836
†Helodus sulcatus Newberry and Worthen 1866
†Helodus undulatus Newberry and Worthen 1866
†Helodus wortheni Hay 1899
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Carroll 1988, Wagner 2023, Hendy et al. 2009 | |||||
Age range: base of the Frasnian to the top of the Wuchiapingian or 382.70000 to 254.17000 Ma
Collections (20 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Frasnian | Australia (New South Wales) | Helodontidae indet. (232510) | |
| Mississippian | USA (Indiana) | Helodus incisus (133271) | |
| Mississippian | United Kingdom | Helodus lavissimus, Helodus didymus, Helodus mammillaris, Helodus planus, Helodus rudis (132781) | |
| Chesterian | Canada (Alberta) | Helodus sp. (62384) | |
| Pennsylvanian | United Kingdom | Helodus simplex (137307) | |
| Westphalian A - Westphalian B | USA (Arizona) | Helodontidae indet. (92271) | |
| Moscovian | United Kingdom | Helodus simplex (137310 137312 137313) | |
| Kasimovian | USA (Nebraska) | Helodus rugosus (132967) | |
| Kasimovian | USA (Illinois) | Helodus sp. (224241) | |
| Permian | USA (Oklahoma) | Helodus sp. (221391) | |
| Artinskian | Greenland | Helodus sp. (90246) | |
| Roadian | Australia (Western Australia) | Helodus sp. (90231) | |
| Roadian | USA (Wyoming) | Helodus subpolitus, Helodus rugosus (149346) | |
| Wuchiapingian | USA (Wyoming) | Helodus subpolitus (90235 90236 90237 90238) | |
| Wuchiapingian | Lithuania | Helodus sp. (222506) |