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Platycrinitacea

Crinoidea - Monobathrida

Synonymy list
YearName and author
1843Platycrinitacea Austin and Austin
1978Platycrinitacea Ubaghs et al. p. T509
1987Platycrinitacea Webster and Lane p. 9
1992Platycrinitoidea Webster and Jell p. 323
1998Platycrinitacea Ausich p. 25
2009Platycrinitoidea Webster et al. p. 245
2012Platycrinitoidea Webster and Webster
2018Platycrinitacea Mao et al. p. 1077

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
—Ambulacraria
phylumEchinodermata
subphylumBlastozoa
RankNameAuthor
classCrinoideaMiller 1821
subclassCamerataWachsmuth and Springer 1885
infraclassEucamerataCole 2017
orderMonobathridaMoore and Laudon 1943
suborderGlyptocrininaMoore 1952
superfamilyPlatycrinitaceaAustin and Austin 1843
superfamilyPlatycrinitaceaAustin and Austin 1843

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. †Platycrinitacea Austin and Austin 1843
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Fm. †Hapalocrinidae Jaekel 1895
+
G. †Bogotacrinus Schmidt 1934
G. †Cantharocrinus Breimer 1962
G. †Clematocrinus Jaekel 1898
+
†Clematocrinus ramsbottomi Fearnhead and Donovan 2006
G. †Cordylocrinus Angelin 1878
G. †Culicocrinus Muller 1855
G. †Cyttarocrinus Goldring 1923
G. †Hapalocrinus Jaekel 1895
+
†Hapalocrinus quinquepennis Ramsbottom 1958
G. †Lyonicrinus Springer 1926
G. †Thallocrinus Jeakel 1895
G. †Theleproktocrinus Witzke and Strimple 1981
Fm. †Hirneacrinidae Frest and Strimple 1977
+
G. †Hagnocrinus Frest and Strimple 1977
+
†Hagnocrinus bainbridgensis Frest and Strimple 1977
†Hagnocrinus balli Frest and Strimple 1977
†Hagnocrinus crenus Frest and Strimple 1977
G. †Hirneacrinus Frest and Strimple 1977
+
†Hirneacrinus cupellaeformis Frest and Strimple 1977
†Hirneacrinus perplanus Frest and Strimple 1977
Fm. †Platycrinitidae Bassler 1938
+
G. †Brahmacrinus Sollas 1900
G. †Camptocrinus Wachsmuth and Springer 1897
+
G. †Chinacrinus Lane and Waters 1997
+
†Chinacrinus xinjiangensis Lane et al. 1997
G. †Collicrinus Ausich and Kammer 2009
+
†Collicrinus laudoni Rhenberg and Kammer 2013
†Collicrinus shumardi Ausich and Kammer 2009
G. †Elegantocrinus Ausich and Kammer 2009
+
†Elegantocrinus annosus Ausich and Kammer 2009
†Elegantocrinus hemisphaericus Ausich and Kammer 2009
G. †Eucladocrinus Meek 1872
+
†Eucladocrinus kentuckiensis Moore and Jeffords 1968
†Eucladocrinus springeri Moore and Jeffords 1968
G. †Neoplatycrinus Wanner 1916
+
†Neoplatycrinus callytharraensis Webster and Jell 1992
†Neoplatycrinus dilatatus Wanner 1916
†Neoplatycrinus major Wanner 1916
†Neoplatycrinus miamiaensis Webster and Jell 1992
G. †Oenochoacrinus Breimer 1962
+
†Oenochoacrinus cortina Miller and Gurley 1894
†Oenochoacrinus limbus Webster and Lane 1987
G. †Platycion Moore and Jeffords 1968
+
†Platycion mingusensis Moore and Jeffords 1968
G. †Platyclonus Moore and Jeffords 1968
+
†Platyclonus dispar Moore and Jeffords 1968
G. †Platycrinites Miller 1821
+
†Platycrinites burlingtonensis Owen and Shumard 1850
†Platycrinites crokeri Campbell and Bein 1971
†Platycrinites ellesmerense Broadhead and Strimple 1977
†Platycrinites halos Webster and Jell 1999
†Platycrinites irroratus Moore and Jeffords 1968
†Platycrinites langbaensis Webster et al. 2009
†Platycrinites nikondaense Broadhead and Strimple 1977
†Platycrinites omanensis Webster and Sevastopulo 2007
†Platycrinites testudo Campbell and Bein 1971
†Platycrinites wachsmuthi Wanner 1916
†Platycrinites wrighti Marez-Oyens 1940
Invalid names: Platycrinus [objective synonym]
G. †Platyparallelus Moore and Jeffords 1968
+
†Platyparallelus parilis Moore and Jeffords 1968
G. †Platyplateium Moore and Jeffords 1968
+
†Platyplateium providencense Moore and Jeffords 1968
†Platyplateium texanum Moore and Jeffords 1968
G. †Platystela Moore and Jeffords 1968
+
†Platystela proiecta Moore and Jeffords 1968
G. †Plemnocrinus Kirk 1946
+
†Plemnocrinus beebei Kirk 1946
†Plemnocrinus bullatus Kirk 1946
†Plemnocrinus homalus Kirk 1946
G. †Pleurocrinus Austin and Austin 1843
+
†Pleurocrinus depressus Wanner 1916
†Pleurocrinus formosus Miller and Gurley 1895
†Pleurocrinus globosus Wanner 1916
†Pleurocrinus goldfussi Wanner 1916
†Pleurocrinus spectabilis Wanner 1916
+
Invalid names: Pleurocrinus pusillus Wanner 1916 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: high Mg calcitec
Ontogeny: accretion, addition of partsp
Environment: marinep
Locomotion: stationaryo
Attached: yeso
Life habit: upper-level epifaunalo
Diet: suspension feedero
Vision: blindc
Dispersal: waterp
Dispersal 2: planktonicp
Created: 2004-02-28 17:13:32
Modified: 2009-10-09 13:32:16
Source: o = order, c = class, p = phylum
References: Aberhan et al. 2004, Kiessling 2004, Aberhan 1992

Age range: base of the Hirnantian to the top of the Wuchiapingian or 445.20000 to 254.14000 Ma

Collections (314 total)


Time interval Ma Country or state Original ID and collection number
Hirnantian445.2 - 443.1USA (Illinois) Culicocrinus girardeauensis (201761)
Llandovery443.1 - 432.9United Kingdom (England) Clematocrinus ramsbottomi (195252)
Llandovery443.1 - 432.9USA (Iowa) Theleproktocrinus davidsoni (26712)
Llandovery - Wenlock443.1 - 426.7USA (New York) Hagnocrinus corporiculus (26801)
Telychian438.6 - 432.9USA (Iowa) Hagnocrinus sp., Lyonicrinus sp. (24963) Theleproktocrinus davidsoni (25015 26763)
Telychian438.6 - 432.9United Kingdom (England) Hapalocrinus sp. (49635)
Telychian - Sheinwoodian438.6 - 430.6USA (Iowa) Hagnocrinus sp. (26769) Hagnocrinus sp., Lyonicrinus sp. (26768)
Sheinwoodian432.9 - 430.6USA (Indiana) Hirneacrinus sp. (26805)
Wenlock432.9 - 426.7USA (Iowa) Lyonicrinus sp., Platycrinitacea indet. (25019)
Wenlock432.9 - 426.7USA (Indiana) Brahmacrinus elongatus, Hirneacrinidae indet. (26771) Hirneacrinidae indet. (26858) Hirneacrinus cupellaeformis, Hirneacrinus perplanus (26811 130071) Hirneacrinus perplanus (130078)
Wenlock - Ludlow432.9 - 422.7USA (Illinois) Hagnocrinus dubius (26770) Hapalocrinidae indet., Hirneacrinidae indet. (26816)
Gorstian426.7 - 425.0United Kingdom Hapalocrinus quinquepennis (119407)
Ludlow426.7 - 422.7USA (Tennessee) Hagnocrinus crenus (131962)
Ludlow426.7 - 422.7Australia (Victoria) Clematocrinus argylensis (39141) Clematocrinus perforatus (39134) Hapalocrinidae indet. (39144) Hapalocrinus victoriae (39138)
Ludlow426.7 - 422.7USA (Indiana) Hapalocrinidae indet. (26688)
Ludlow426.7 - 422.7USA (Missouri) Hagnocrinus balli, Hagnocrinus bainbridgensis (131963) Hagnocrinus n. sp., Cordylocrinus dubius, Hagnocrinus balli, Hagnocrinus bainbridgensis (26822) Hirneacrinus sp. (26821)
Ludfordian - Pridoli425.0 - 419.62USA (Oklahoma) Hagnocrinus sp. (26824)
Pridoli422.7 - 419.62USA (West Virginia) Hapalocrinus sp. (26825)
Leintwardine421.3 - 419.62United Kingdom Hapalocrinus quinquepennis (95143)
Lochkovian419.62 - 413.02Czechia Camptocrinus sp., Platycrinitidae indet. (94441) Hapalocrinus sp., Platycrinitidae indet. (94439)
Lochkovian419.62 - 413.02Australia (Victoria) Clematocrinus perforatus (39125)
Lochkovian419.62 - 413.02USA (New York) Cordylocrinus plumosus, Cordylocrinus ramulosus (26690)
Early/Lower Emsian410.62 - 399.5Germany Culicocrinus spinatus (74300) Hapalocrinus elegans, Hapalocrinus innoxius, Hapalocrinus penniger, Thallocrinus acifer, Thallocrinus hauchecornei, Thallocrinus procerus, Thallocrinus rugosus (26904)
Early/Lower Emsian410.62 - 399.5Germany (Gemuenden) Culicocrinus spinatus, Hapalocrinus rauffi (26903)
Givetian387.95 - 382.31USA (New York) Cyttarocrinus eriensis (5656 5659 5662 5663 76137) Cyttarocrinus sp. (5661)
Famennian372.15 - 358.86China (Xinjiang) Chinacrinus nodosus (3565 124044) Chinacrinus sp. (3564) Chinacrinus sp. A, Chinacrinus sp. B, Chinacrinus sp., Chinacrinus xinjiangensis (3561) Chinacrinus xinjiangensis (124085)
Famennian372.15 - 358.86Mongolia (Hovd) Chinacrinus xinjiangensis (222971)
Famennian372.15 - 358.86Germany (Nordrhein-Westfalen) Platycrinites sp. (38294 38325 38327)
Late/Upper Famennian365.2 - 358.86USA (Missouri) Platycrinus dodgei (6027)
Late/Upper Famennian365.2 - 358.86Germany (Nordrhein-Westfalen) Platycrinites sp. (38304)
Kinderhookian358.86 - 351.9USA (Utah) Platycrinites sp. (42028)
Kinderhookian358.86 - 351.9Canada (Alberta) Platycrinites sunwaptaensis, Platycrinites decadactylus (8610)
Kinderhookian358.86 - 351.9USA (Illinois) Platycrinus sp. (5931)
Kinderhookian358.86 - 351.9USA (Indiana) Platycrinites sp. (6733 6734)
Kinderhookian358.86 - 351.9USA (Iowa) Platycrinites sp. (73163 73273) Platycrinus sp. (5933)
Tournaisian358.86 - 346.7USA (Idaho) Platycrinites sp. (12798)
Tournaisian358.86 - 346.7USA (Iowa) Platycrinites sp. (3309 3314 3339)
Tournaisian358.86 - 346.7USA (Kentucky) Platycrinites glyptus (65686 65689 65691) Platycrinites glyptus, Platycrinites planus, Platycrinites spinifer (65685)
Kinderhookian - Osagean358.86 - 342.9USA (Nevada) Platycrinus sp. (5750)
Kinderhookian - Osagean358.86 - 342.9USA (Utah) Platycrinus graphicus (5755)
Hastarian - Chadian358.86 - 339.9Australia (New South Wales) Platycrinites crokeri (119337) Platycrinites sp. 1, Platycrinites sp. 2, Platycrinites testudo, Platycrinites crokeri (119334) Platycrinitidae indet. (119338)
Mississippian358.86 - 323.4USA (Idaho) Platycrinus sp. (184606 184607)
Mississippian358.86 - 323.4USA (Indiana) Camptocrinus sp., Platycrinites sp. (224230) Platycrinites sp. (224221 224226 224227 224229 224232)
Mississippian358.86 - 323.4USA (Alaska) Platycrinus sp. (112176)
Carboniferous358.86 - 298.9USA (Montana) Platycrinus incomptus, Platycrinus bozemanensis (12771)
Carboniferous358.86 - 298.9USA (Georgia) Platycrinites hemisphericus (164685)
Ivorian - Chadian353.7 - 339.9Ireland Brahmacrinus ponderosus (76515)
Osagean351.9 - 342.9USA (Kentucky) Eucladocrinus millebrachiatus, Platycrinites hemisphaericus (6202 6203 6204 6205 6206 165192 165193 165195 165201) Platycrinites hemisphaericus (6200 165191 165200 165202 165244 165245)
Osagean351.9 - 342.9USA (Iowa) Platycrinites yandelli (230511)
Osagean351.9 - 342.9USA (Indiana) Camptocrinus sp., Platycrinites sp. (567) Platycrinites hemisphericus (180968) Platycrinites hemisphericus, Platycrinites sp. (2257) Platycrinites saffordi (2455) Platycrinites sp. (550) Platycrinus sp. (6670)
Osagean351.9 - 342.9USA (New Mexico) Elegantocrinus canaliculatus, Elegantocrinus pocilliformis, Platycrinites parvinodus, Plemnocrinus bullatus, Plemnocrinus homalus, Pleurocrinus quinquenodus (235911) Elegantocrinus pileiformis, Pleurocrinus quinquenodus (235917) Elegantocrinus pocilliformis (235926) Elegantocrinus pocilliformis, Elegantocrinus sp. B, Platycrinites parvinodus, Platycrinites peculiaris, Plemnocrinus bullatus, Plemnocrinus homalus (235906) Eucladocrinus sp., Elegantocrinus sp. A, Platycrinites parvinodus, Platycrinites peculiaris, Plemnocrinus bullatus, Plemnocrinus homalus (235923) Eucladocrinus sp., Oenochoacrinus limbus, Collicrinus shumardi, Collicrinus laudoni, Elegantocrinus nodostriatus, Elegantocrinus pileiformis, Elegantocrinus sp. A, Platycrinites peculiaris, Eucladocrinus pleurovimenus, Plemnocrinus bullatus, Plemnocrinus homalus, Plemnocrinus subspinosus, Pleurocrinus quinquenodus (235903) Oenochoacrinus limbus, Elegantocrinus canaliculatus, Elegantocrinus pocilliformis, Platycrinites burlingtonensis, Platycrinites illinoisensis, Platycrinites peculiaris, Eucladocrinus pleurovimenus, Plemnocrinus bullatus, Plemnocrinus homalus, Pleurocrinus quinquenodus (235905) Platycrinites illinoisensis, Plemnocrinus homalus (235922) Platycrinites peculiaris, Plemnocrinus bullatus, Plemnocrinus homalus (235912) Platycrinites sp., Pleurocrinus sp., Collicrinus shumardi, Elegantocrinus pileiformis, Elegantocrinus pocilliformis, Elegantocrinus sp. A, Elegantocrinus annosus, Platycrinites parvinodus, Platycrinites peculiaris, Eucladocrinus pleurovimenus, Plemnocrinus bullatus, Plemnocrinus homalus, Plemnocrinus subspinosus, Pleurocrinus quinquenodus (235910) Plemnocrinus bullatus (235925) Plemnocrinus bullatus, Plemnocrinus homalus (235914 235915) Plemnocrinus homalus (235924)
Osagean351.9 - 342.9USA (Tennessee) Eucladocrinus millebrachiatus (165239) Eucladocrinus millebrachiatus, Platycrinites saffordi (165240) Platycrinites hemisphaericus (165203 165241)
Osagean - Chadian351.9 - 339.9USA (Kentucky) Eucladocrinus millebrachiatus (165199) Eucladocrinus millebrachiatus, Platycrinites hemisphaericus (6201)
Arundian - Holkerian346.7 - 339.9Ireland Platycrinites bellmanensis, Platycrinites externus, Platycrinites gigas, Platycrinites granulatus, Platycrinites humilis, Platycrinites insulsus, Pleurocrinus coronatus, Pleurocrinus mucronatus, Pleurocrinus rugosus, Pleurocrinus sp. (76517)
Chadian346.7 - 339.9United Kingdom Platycrinites diadema, Platycrinites pileatus, Platycrinites bellmanensis, Platycrinites megastylus, Platycrinites granulatus, Platycrinites jameswrighti, Pleurocrinus mucronatus, Pleurocrinus coronatus, Pleurocrinus rugosus, Pleurocrinus suberculatus (90820)
Chadian346.7 - 339.9USA (Tennessee) Platycrinites sp. (6914)
Chadian346.7 - 339.9USA (Kentucky) Eucladocrinus millebrachiatus (5869) Platycrinites hemisphericus (5871) Platycrinites sculptus (5870) Platycrinites sp. (2641 2643 2673 2680 2681 2689 2690)
Chadian346.7 - 339.9USA (Indiana) Camptocrinus plenicirrus, Platycrinites hemisphericus, Platycrinites nodostriatus (2059) Platycrinites hemispericus, Platycrinites nodostriatus, Platycrinites saffordi, Platycrinites sp. (2208) Platycrinites hemisphericus (2439) Platycrinites hemisphericus, Platycrinites nodostriatus (2252) Platycrinites hemisphericus, Platycrinites nodostriatus, Platycrinites safordi, Platycrinites sp., Platycrinites indet. (2202) Platycrinites hemisphericus, Platycrinites saffordi (2191) Platycrinites hemisphericus, Platycrinites sp. (2187 2207) Platycrinites nodostriatus (2185) Platycrinites saffordi (2251 2448) Platycrinites sp. (2445)
Chadian - Arundian346.7 - 339.9USA (Tennessee) Platycrinites sp. (6915 6916 6917 6920 6922 6923)
Chadian - Arundian346.7 - 339.9USA (Indiana) Camptocrinus sp., Platycrinites sp. (556) Platycrinites hemisphericus (8113 8114 8115 8118 8119 8120 8121 8126 8127 8128 8129 8130 8131 8134 8135 8136 8137 8138 8139) Platycrinites sp. (557 558 8067 8068 8069 8070 8071 8072 8073 8075 8080)
Chadian - Arundian346.7 - 339.9USA (Kentucky) Camptocrinus crawfordsvillensis, Camptocrinus nudus, Eucladocrinus millebrachiatus, Platycrinites georgii, Platycrinites hemisphaericus (37879)
Holkerian346.7 - 339.9United Kingdom (England) Platycrinitidae indet. (41284)
Visean346.7 - 330.3Poland Platycrinitidae indet. (216786)
Meramecian342.9 - 335.4USA (Indiana) Platycrinites bonoensis (2833 2835)
Meramecian342.9 - 335.4USA (Virginia) Platycrinus penicillus (7016 7045 7046 7049 7053)
Meramecian342.9 - 335.4Canada (Alberta) Platycrinus penicillus (62396)
Meramecian342.9 - 335.4USA (Kentucky) Camptocrinus sp., Platycrinites bonoensis (2780 2826 2828 2831) Platycrinites bonoensis (2779 2781) Platycrinites sp. (2713)
Brigantian335.9 - 330.3United Kingdom Camptocrinus compressus, Platycrinites conglobatus, Platycrinites crassiconus, Platycrinites invertielensis, Platycrinites spiniger (90822) Platycrinites crassiconus (90825) Platycrinites crassiconus, Platycrinites spiniger (90823 90824) Platycrinites spiniger (90827)
Brigantian335.9 - 330.3USA (Alabama) Camptocrinus columnals (6751) Camptocrinus sp. (6755 6757 6759 6762 6763 6764 6765 6769 6773 6777 6780 6782 6789 6790 6791 6792 6793 6794 6795 6797 6799 6801 6804 6807 6809 6811 6812 6823 6831 6835 6837 6841 6844 6845 6846 6847 6848) Camptocrinus sp., Platycrinites sp. (2710)
Chesterian335.4 - 323.4USA (Virginia) Platycrinus penicillus (7030 7035)
Chesterian335.4 - 323.4USA (Kentucky) Camptocrinus sp. (206292)
Serpukhovian330.3 - 323.4USA (Oklahoma) Platycrinites sp. (5611)
Serpukhovian - Bashkirian330.3 - 315.2Antarctica Platycrinitidae indet. (41799 41805)
Morrowan323.4 - 318.6USA (Oklahoma) Platycrinites sp. (128690)
Yeadonian320.0 - 318.7Iran Platycrinites n. sp. (230509 230510)
Moscovian315.2 - 307.0USA (Nevada) Platycrinitidae indet. (39158)
Moscovian315.2 - 307.0China (Xinjiang) Platycrinites sp., Platycrinitidae indet. (92637) Platycrinites spp., Platycrinitidae indet. (92636)
Moscovian315.2 - 307.0China Platycrinites spp. (90770)
Asselian298.9 - 293.52China (Henan) Platycrinitidae indet. (197054)
Cisuralian - Guadalupian298.9 - 259.51USA (Alaska) Platycrinites nikondaense (104954)
Permian298.9 - 251.902Indonesia (Timor) Neoplatycrinus dilatatus, Neoplatycrinus transitorius (223612) Neoplatycrinus somoholensis (223629) Platycrinus wachsmuthi (223623) Platycrinus wachsmuthi, Neoplatycrinus dilatatus (223631)
Permian298.9 - 251.902Indonesia Platycrinus wachsmuthi (133132)
Sakmarian293.52 - 290.1Australia (Western Australia) Camptocrinus sp. (95203 95204 95205 95206 95207 95208 95209 95210) Camptocrinus sp., Platycrinites wrighti (95211 95212 95213 95214) Neoplatycrinus callytharraensis (120564 120566) Platycrinitidae indet. (120568) Platycrinitidae indet., Neoplatycrinus callytharraensis (120567) Pleurocrinus sp., Neoplatycrinus callytharraensis (120563) Pleurocrinus sp., Platycrinites wrighti (120565) Pleurocrinus sp., Platycrinites wrighti, Neoplatycrinus somoholensis, Camptocrinus indoaustralicus (88211) Pleurocrinus sp., Platycrinitidae indet., Neoplatycrinus callytharraensis (120562)
Sakmarian293.52 - 290.1Canada (British Columbia) Platycrinites n. sp. 1, Platycrinites n. sp. 2 (98045)
Sakmarian - Artinskian293.52 - 283.3Indonesia (Timor) Platycrinus sp. (223627)
Sakmarian - Artinskian293.52 - 283.3Timor-Leste Platycrinus rugosus (21163)
Artinskian290.1 - 283.3Indonesia Camptocrinus indoaustralicus, Platycrinus wachsmuthi, Neoplatycrinus dilatatus, Neoplatycrinus major, Pleurocrinus depressus, Pleurocrinus spectabilis, Pleurocrinus pusillus, Pleurocrinus goldfussi, Pleurocrinus globosus, Neoplatycrinus transitorius (118268)
Artinskian290.1 - 283.3Australia (Western Australia) Neoplatycrinus miamiaensis (84851 85318)
Artinskian290.1 - 283.3Slovenia Platycrinitidae indet. (236360)
Artinskian290.1 - 283.3Oman Platycrinites omanensis (77176)
Artinskian290.1 - 283.3USA (Nevada) Platycrinites sp. (74742)
Artinskian - Kungurian290.1 - 274.4Indonesia Platycrinus sp. (39614)
Artinskian - Guadalupian290.1 - 259.51Indonesia (Timor) Neoplatycrinus major (205605)
Roadian - Wordian274.4 - 264.28Indonesia Platycrinus wachsmuthi, Neoplatycrinus dilatatus, Neoplatycrinus major (39618) Platycrinus wachsmuthi, Neoplatycrinus dilatatus, Neoplatycrinus major, Pleurocrinus pusillus, Pleurocrinus globosus (39608 39610)
Roadian - Wordian274.4 - 264.28Indonesia (Timor) Platycrinus wachsmuthi (223613)
Roadian - Wuchiapingian274.4 - 254.14Indonesia (Timor) Platycrinites wachsmuthi, Neoplatycrinus dilatatus, Neoplatycrinus major (126596)
Capitanian264.28 - 259.51Canada (Nunavut) Platycrinites ellesmerense (104953)
Wuchiapingian259.51 - 254.14Indonesia (Timor) Platycrinus wachsmuthi, Neoplatycrinus dilatatus, Neoplatycrinus major (223607)
Wuchiapingian259.51 - 254.14Australia (Queensland) Platycrinitidae indet., Platycrinites halos (120593)