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Helodus
Taxonomy
Helodus was named by Agassiz (1838) [Sepkoski's age data: teeth]. Its type is Helodus simplex.
It was assigned to Cochliodontidae by Woodward (1889), Hay (1902), Jordan (1963); to Holocephali by Sepkoski (2002); and to Helodontidae by Nelson (2006).
It was assigned to Cochliodontidae by Woodward (1889), Hay (1902), Jordan (1963); to Holocephali by Sepkoski (2002); and to Helodontidae by Nelson (2006).
Species
H. angulatus, H. biformis, H. carbonarius, H. coniculus, H. consolidatus, H. crenulatus, H. denshumani, H. denticulatus, H. didymus, H. elytra, H. gibberulus, H. gibbus, H. incisus, H. laevis, H. limax, H. mammillaris, H. planus, H. politus, H. rudis, H. rugosus, H. simplex (type species), H. subpolitus, H. subteres, H. sulcatus, H. undulatus, H. wortheni
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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. †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: Wagner 2023, Carroll 1988, Hendy et al. 2009 | |||||
Age range: base of the Chesterian to the top of the Wuchiapingian or 335.40000 to 254.14000 Ma
Collections (25 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Tournaisian - Visean | United Kingdom | H. subteres (238358) | |
| Mississippian | United Kingdom | H. lavissimus, H. didymus, H. mammillaris, H. planus, H. rudis (132781) | |
| Mississippian | USA (Indiana) | H. incisus (133271) | |
| Chesterian | Canada (Alberta) | H. sp. (62384) | |
| Serpukhovian | United Kingdom (Scotland) | H. sp. (235483) | |
| Pennsylvanian | United Kingdom | H. simplex (137307) | |
| Moscovian | United Kingdom | H. simplex (137310 137312 137313) | |
| Kasimovian | USA (Nebraska) | H. rugosus (132967) | |
| Kasimovian | USA (Illinois) | H. sp. (224241) | |
| Permian | USA (Oklahoma) | H. sp. (221391) | |
| Artinskian | Greenland | H. sp. (90246) | |
| Roadian | USA (Wyoming) | H. subpolitus, H. rugosus (149346) | |
| Roadian | Australia (Western Australia) | H. sp. (90231) | |
| Guadalupian | USA (Wyoming) | H. subpolitus (236333 236340) | |
| Wuchiapingian | Lithuania | H. sp. (222506) | |
| Wuchiapingian | USA (Wyoming) | H. subpolitus (90235 90236 90237 90238 236334 236341) | |
| Lopingian | USA (Wyoming) | H. subpolitus (236347) |