Platycrinitidae

Platycrinites saffordi, from U. S. National Museum of Natural History.

Belongs within: Glyptocrinina.

The Platycrinitidae are a group of crinoids known from the Upper Silurian or Devonian to the Permian (Ubaghs 1978b).

Characters (from Ubaghs 1978b): Calyx confined to patina of five radials, and three unequal basal which may be fused; posterior side commonly not differentiated; orals distinct; interambulacrals and ambulacrals important tegminal elements but absent in youngest genera; first primibrachs typically axillary. Arms biserial, pinnulate. Column transversely round proximally, elliptical and twisted distally, with synarthrial articulation, fulcral ridge following long diameter of columnals; axial canal small, round.

Platycrinitidae [Platycrinidae, Platycrinoidea]
    |--Neoplatycrinus Wanner 1916 U78b
    |    `--*N. dilatatus Wanner 1916 U78b
    |--Brahmacrinus Sollas 1900 U78b
    |    `--*B. ponderosus Sollas 1900 U78b
    |--Plemnocrinus Kirk 1946 U78b
    |    `--*P. beebei Kirk 1946 U78b
    |--Oenochoacrinus Breimer 1962 U78b
    |    |--*O. princeps Breimer 1962 U78b
    |    `--O. pileatus U78a
    |--Chinacrinus Lane, Waters & Maples 1997 WM03
    |    |--C. nodosus WM03
    |    `--C. xinjiangensis Lane, Waters & Maples 1997 WM03
    |--Pleurocrinus Austin & Austin 1843 [=Medusacrinus Austin 1875] U78b
    |    |--*P. mucronatus (Austin in Austin & Austin 1843) [=Platycrinites mucronatus, *Medusacrinus mucronatus] U78b
    |    `--P. coronatus U78b
    |--Eucladocrinus Meek 1872 U78b
    |    |--*E. montanaensis (Meek 1872) [=Platycrinites (Eucladocrinus) montanaesis] U78b
    |    |--E. millebrachiatus U78a
    |    |    |--E. m. millebrachiatus U78a
    |    |    `--E. m. immaturus U78a
    |    `--E. pleuroviminus U78b
    `--Platycrinites Miller 1821 LMW01 (see below for synonymy)
         |--*P. laevis Miller 1821 U78b[=*Platycrinus laevis U78b; incl. Platycrinus vexabilis White 1877 W77]
         |--P. anguliferus (Whidborne 1898) (n. d.) [=Platycrinus anguliferus] LMW01
         |--P. austinianus U78a
         |--P. bozemanensis U78a
         |--P. burlingtonensis U78b
         |--P. gigas Gilbertson in Phillips 1836 [=*Centrocrinus gigas] U78b
         |--P. guttifer Schmidt 1930 LMW01
         |--P. hemisphericus U78a
         |--‘*Atocrinus’ milleri M’Coy in Griffith 1842 U78b
         |--‘Platycrinus’ nux Etheridge 1892 F71
         |--P. regalis U78a
         |--P. saffordi U78b
         `--P. symmetricus U78a

Platycrinites Miller 1821 LMW01 [=Platycrinus Agassiz 1836 U78b; incl. Atocrinus M’Coy in Griffith 1842 U78b, Centrocrinus Austin & Austin 1843 U78b]

*Type species of generic name indicated

REFERENCES

[F71] Fletcher, H. O. 1971. Catalogue of type specimens of fossils in the Australian Museum, Sydney. Australian Museum Memoir 13: 1-167.

[LMW01] Lane, N. G., C. G. Maples & J. A. Waters. 2001. Revision of Late Devonian (Famennian) and some Early Carboniferous (Tournaisian) crinoids and blastoids from the type Devonian area of north Devon. Palaeontology 44 (6): 1043-1080.

[U78a] Ubaghs, G. 1978a. Skeletal morphology of fossil crinoids. In Treatise on Invertebrate Paleontology pt. T. Echinodermata 2. Crinoidea (R. C. Moore & C. Teichert, eds) vol. 1 pp. T58-T216. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[U78b] Ubaghs, G. 1978b. Camerata. In Treatise on Invertebrate Paleontology pt. T. Echinodermata 2. Crinoidea (R. C. Moore & C. Teichert, eds) vol. 2 pp. T408-T519. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[WM03] Waters, J. A., C. G. Maples, N. G. Lane, S. Marcus, Liao Z.-T., Liu L., Hou H.-F. & Wang J.-X. 2003. A quadrupling of Famennian pelmatozoan diversity: New Late Devonian blastoids and crinoids from northwest China. Journal of Paleontology 77 (5): 922-948.

[W77] White, C. A. 1877. Report upon the invertebrate fossils collected in portions of Nevada, Utah, Colorado, New Mexico, and Arizona, by parties of the expeditions of 1871, 1872, 1873, and 1874. U.S. Geographical Surveys West of the One Hundredth Meridian 4 (1): 1-219, pls 211-221.