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Cheirocrinidae
Taxonomy
Cheirocrinidae was named by Jaekel (1899).
It was assigned to Glyptocystitida by Beaver et al. (1967); to Glyptocystitida by Regnéll (1945), Sumrall and Schumacher (2002) and Broadhead and Sumrall (2003); and to Glyptocystitoida by Paul and Rozhnov (2016), Paul et al. (2019) and Liu et al. (2024).
It was assigned to Glyptocystitida by Beaver et al. (1967); to Glyptocystitida by Regnéll (1945), Sumrall and Schumacher (2002) and Broadhead and Sumrall (2003); and to Glyptocystitoida by Paul and Rozhnov (2016), Paul et al. (2019) and Liu et al. (2024).
Synonymy list
| Year | Name and author |
|---|---|
| 1899 | Cheirocrinidae Jaekel |
| 1945 | Cheirocrinidae Regnéll |
| 1967 | Cheirocrinidae Beaver et al. p. S179 |
| 2002 | Cheirocrinidae Sumrall and Schumacher p. 848 |
| 2003 | Cheirocrinidae Broadhead and Sumrall p. 119 |
| 2016 | Cheirocrinidae Paul and Rozhnov p. 266 |
| 2019 | Cheirocrinidae Paul et al. |
| 2024 | Cheirocrinidae Liu 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.
Fm. †Cheirocrinidae Jaekel 1899
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G. †Acanthalepis McCoy 1846
G. †Cheirocrinus Eichwald 1856
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†Cheirocrinus chrysalis Hall 1860
†Cheirocrinus constrictus Bather 1913
†Cheirocrinus dilatatus Regnell 1951
†Cheirocrinus holmi Regnéll 1945
†Cheirocrinus leuchtenbergi Angelin 1899
†Cheirocrinus logani Billings 1857
†Cheirocrinus nodosus Jaekel 1899
†Cheirocrinus penniger Eichwald 1842
G. †Cheirocystella Paul 1972
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†Cheirocystella antiqua Paul 1972
†Cheirocystella languedociunus Thoral 1935
G. †Cheirocystis Paul 1972
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†Cheirocystis anatiformis Hall 1847
†Cheirocystis ardmorensis Bassler 1943
†Cheirocystis fultonensis Sumrall and Schumacher 2002
†Cheirocystis liexiensis Liu et al. 2024
†Cheirocystis radiatus Jaekel 1899
G. †Coronocystis Paul 1972
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†Coronocystis angulatus Wood 1909
†Coronocystis durandensis Kolata 1975
G. †Hadrocystis Sprinkle 1974
G. †Leptocystis
G. †Sprinkleocystis Broadhead and Sumrall 2003
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†Sprinkleocystis ektopios Broadhead and Sumrall 2003
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. R. C. Paul and S. V. Rozhnov 2016 | Glyptocystitoid family with six radial plates; large periproct usually surrounded by five thecal plates, but always with plate L1 contributing to border and covered with flexible, plated integument within which simple anal pyramid located at lower right. | |
| C. R. C. Paul et al. 2019 | Glyptocystitida with six or more pectinirhombs; with a cylindrical theca having six radials; a large lateral periproct surrounded by five thecal plates and covered with a flexible plated integument; five, usually short, ambulacra with 5–15 brachioles each, rarely extending into clefts in the radial plates (modified from Paul, 1984, pp. 97–8). |