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Hexacrinitacea
Taxonomy
Hexacrinitacea was named by Wachsmuth and Springer (1885). Its type is Hexacrinidae.
It was corrected as Hexacrinitoidea by Webster et al. (1999), Webster (2012), Webster and Webster (2012), Webster et al. (2025).
It was assigned to Monobathrida by Webster et al. (1999); and to Compsocrinina by Ubaghs et al. (1978), Webster and Lane (1987), Webster (2012), Webster and Webster (2012), Webster et al. (2025).
It was corrected as Hexacrinitoidea by Webster et al. (1999), Webster (2012), Webster and Webster (2012), Webster et al. (2025).
It was assigned to Monobathrida by Webster et al. (1999); and to Compsocrinina by Ubaghs et al. (1978), Webster and Lane (1987), Webster (2012), Webster and Webster (2012), Webster et al. (2025).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1885 | Hexacrinitacea Wachsmuth and Springer |
| 1978 | Hexacrinitacea Ubaghs et al. p. T473 |
| 1987 | Hexacrinitacea Webster and Lane p. 9 |
| 1999 | Hexacrinitoidea Webster et al. p. 465 |
| 2012 | Hexacrinitoidea Webster p. 66 |
| 2012 | Hexacrinitoidea Webster and Webster |
| 2025 | Hexacrinitoidea Webster et al. p. 647 |
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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.
Superfm. †Hexacrinitacea Wachsmuth and Springer 1885
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Fm. †Hexacrinitidae Wachsmuth and Springer 1885
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G. †Hexacrinites Austin and Austin 1843
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†Hexacrinites pinnulata Waters et al. 2003
Invalid names: Hexacrinus perdubius de Gregorio 1930 [nomen dubium]
G. †Megaradialocrinus Chen and Yao 1993
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†Megaradialocrinus crispus Quenstedt 1861
†Megaradialocrinus granuliferus Roemer 1843
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Invalid names: Hexacrinites microglyphicus Whidborne 1889 [synonym], Hexacrinites vicarii Whidborne 1889 [synonym]
G. †Oehlerticrinus Le Menn 1975
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†Oehlerticrinus anguliferus Whidborne 1898
†Oehlerticrinus peachi Donovan and Fearnhead 2017
G. †Platyhexacrinus Schmidt 1913
G. †Prohexacrinus Yakovlev 1946
G. †Wacrinus Jell and Jell 1999
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†Wacrinus caseyensis Jell and Jell 1999
†Wacrinus millardensis Jell and Jell 1999
Fm. †Parahexacrinidae Shevchenko 1967
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G. †Agathocrinus Stoddart 1876
G. †Amonohexacrinus Schevchenko 1967
G. †Parahexacrinus Shevchenko 1967
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum | |||||
| References: Kiessling 2004, Aberhan 1992, Aberhan et al. 2004 | |||||
Age range: base of the Ludfordian to the top of the Wordian or 425.00000 to 264.28000 Ma
Collections (69 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Silurian | USA (Oklahoma) | Hexacrinites sp. (528) | |
| Ludlow | USA (Oklahoma) | Hexacrinites carinatus, Hexacrinites adaensis (26823) | |
| Ludfordian - Pridoli | USA (Oklahoma) | Hexacrinites carinatus (26824) | |
| Pridoli | USA (Tennessee) | Hexacrinites sp. (26772) | |
| Lochkovian | Australia (Victoria) | Hexacrinites chirnsidensis (39128) Oehlerticrinus lemenni, Oehlerticrinus jeani (39121 39125) | |
| Lochkovian | Vietnam | Hexacrinites humilicarinatus (83324) | |
| Lochkovian | Czechia | Hexacrinites ariel (94441 94444) Hexacrinites ariel, Oehlerticrinus sp. (94439) | |
| Devonian | USA (New York) | Arthracantha ithacensis (123539) | |
| Pragian | Vietnam | Hexacrinites biconcavus, Hexacrinites torulosus, Hexacrinites humilicarinatus, Hexacrinites trangxaensis (83248) Hexacrinites humilicarinatus, Hexacrinites tuberosus (83326) | |
| Pragian | Czechia | Hexacrinites antares (14134) Hexacrinites rigel (14136) | |
| Pragian | France (Bretagne) | Oehlerticrinus sculptus (81603) | |
| Siegen | Australia (Victoria) | Hexacrinites sp. (56699) | |
| Pragian - Emsian | Tajikistan | Hexacrinites karzevae (45830) Hexacrinites sp. (45831) | |
| Pragian - Emsian | United Kingdom | Oehlerticrinus peachi (191370) | |
| Early/Lower Emsian | Tajikistan | Hexacrinites argutus (45841) | |
| Early/Lower Emsian | Czechia | Arthroacantha vega, Hexacrinites antares, Hexacrinites ariel, Hexacrinites rigel (14137) | |
| Early/Lower Emsian | Germany (Gemuenden) | Arthroacantha claviger (26903) | |
| Emsian | New Zealand | Hexacrinites sp. (40527) | |
| Emsian | France (Alsace) | Hexacrinites tenicrenulatus, Hexacrinites maximus (40505) | |
| Emsian | South Africa | Arthroacantha sp. (35578) | |
| Emsian | Germany (North Rhine-Westphalia) | Arthroacantha ithacensis (235091) | |
| Emsian - Givetian | Australia (Queensland) | Hexacrinites interscapularis, Hexacrinites spinosus (40023) | |
| Late/Upper Emsian | Tajikistan | Hexacrinites sp. (45825 45838 45842) | |
| Eifelian | Vietnam | Hexacrinites humilicarinatus (83321) | |
| Eifelian | Mongolia | Hexacrinites cauliculatus, Hexacrinites karzevae (79716) | |
| Eifelian | Australia (Queensland) | Hexacrinites interscapularis (40022) | |
| Eifelian - Givetian | Canada (Ontario) | Arthroacantha carpenteri (75583) | |
| Middle Devonian | Canada (Ontario) | Arthroacantha carpenteri (193694) | |
| Middle Devonian | USA (New York) | Arthroacantha carpenteri (91091 91216) | |
| Late/Upper Eifelian | Germany | Hexacrinites sp. (60140) | |
| Early/Lower Givetian | Germany (Rhineland-Palatinate) | Hexacrinites nodifer (235975) | |
| Early/Lower Givetian | Germany | Megaradialocrinus elongatus, Megaradialocrinus crispus (144265) | |
| Givetian | USA (Ohio) | Arthroacantha carpenteri (38457 38458 38459 38460 38462 38463 38464) | |
| Givetian | USA (Indiana) | Arthroacantha carpenteri (66002) | |
| Givetian | USA (Maryland) | Arthroacantha punctobrachiata (10453) | |
| Givetian | Germany | Hexacrinites pateraeformis, Megaradialocrinus brevis, Megaradialocrinus globohirsutus (144266) Hexacrinites pateraeformis, Megaradialocrinus brevis, Megaradialocrinus hieroglyphicus (144264) Hexacrinites pateraeformis, Megaradialocrinus crispus (144259) | |
| Givetian | USA (Michigan) | Arthroacantha carpenteri (38475) | |
| Late/Upper Givetian | Russian Federation (Orenburgskaya Oblast) | Hexacrinites kartzevae, Hexacrinites humilicarinatus (83914) | |
| Late/Upper Givetian | Germany (Rhineland-Palatinate) | Hexacrinus granulifer (275563) | |
| Late/Upper Frasnian | Germany (Rhineland-Palatinate) | Megaradialocrinus sp. (236362) | |
| Late/Upper Frasnian | Australia (Western Australia) | Hexacrinites brownlawi (38996) | |
| Famennian | China (Xinjiang) | Agathocrinus junggarensis, Hexacrinites pinnulata (123199) Agathocrinus junggarensis, Hexacrinites sp. (3564) | |
| Famennian | Tajikistan | Hexacrinites sp. (184358) | |
| Middle Famennian | Australia (Western Australia) | Wacrinus caseyensis, Wacrinus millardensis (38990) | |
| Late/Upper Famennian | United Kingdom (England) | Adelocrinus hystrix, Oehlerticrinus anguliferus (242158) Hexacrinites sp. B, Adelocrinus hystrix, Oehlerticrinus anguliferus (242159) | |
| Kinderhookian | USA (Illinois) | Hexacrinites mississippiensis (5749) | |
| Tournaisian | Libya | Platyhexacrinus sp. (36829) | |
| Moscovian | China | Hexacrinitidae indet. (90770) | |
| Wordian | Italy | Hexacrinus perdubius (233340) |