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Petalocrinus
Classification
Phylum:
Echinodermata
Class:
Crinoidea
Order:
Cladida
Superfamily:
Gasterocomacea
Family:
Petalocrinidae
Formal Genus Name and Reference:
Petalocrinus Weller & DAVIDSON, 1896, p. 167
Type Species:
* P. mirabilis, OD
Images
(Click to enlarge in a new window)
Fig. 383, 1a, b. P. inferior Bather, Iowa, 1 a, b, ventral and dorsal views of arm plate, x1 (Springer, 1926a), Fig. 383, 1 c-e. * P. mirabilis, Iowa, 1 c, d, ventral and dorsal views of arm plates, artificially mounted, x1, le, dorsal view of crown with arm-fans broken away, x2 (Springer, 1926a)
Synonyms
Geographic Distribution
USA (Iowa-Ind.-Ohio)-Eu. (Sweden)
Age Range
Beginning Stage in Treatise Usage:
M.Sil. (Niagaran, Wenlock.)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
33.3
Beginning Date:
439.86
Ending Stage in Treatise Usage:
M.Sil. (Niagaran, Wenlock.)
Ending International Stage:
Gorstian
Fraction Up In Ending Stage:
100
Ending Date:
425.01
Description
Cup small, bowl shaped, infrabasals hidden under proximal columnal, radials large, with large, vertically directed articular facets and large axial canal, brachials of each ray completely fused into single, large, fan-shaped arm plate bearing covered ambulacral grooves on ventral side, arm plates smooth on dorsal side, articulated to radials by single, short, primibrach
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Class:
Crinoidea
Order:
Cladida
Superfamily:
Gasterocomacea
Family:
Petalocrinidae
Formal Genus Name and Reference:
Petalocrinus Weller & DAVIDSON, 1896, p. 167
Type Species:
* P. mirabilis, OD
Images
(Click to enlarge in a new window)
Fig. 383, 1a, b. P. inferior Bather, Iowa, 1 a, b, ventral and dorsal views of arm plate, x1 (Springer, 1926a), Fig. 383, 1 c-e. * P. mirabilis, Iowa, 1 c, d, ventral and dorsal views of arm plates, artificially mounted, x1, le, dorsal view of crown with arm-fans broken away, x2 (Springer, 1926a)
Synonyms
Geographic Distribution
USA (Iowa-Ind.-Ohio)-Eu. (Sweden)
Age Range
Beginning Stage in Treatise Usage:
M.Sil. (Niagaran, Wenlock.)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
33.3
Beginning Date:
439.86
Ending Stage in Treatise Usage:
M.Sil. (Niagaran, Wenlock.)
Ending International Stage:
Gorstian
Fraction Up In Ending Stage:
100
Ending Date:
425.01
Description
Cup small, bowl shaped, infrabasals hidden under proximal columnal, radials large, with large, vertically directed articular facets and large axial canal, brachials of each ray completely fused into single, large, fan-shaped arm plate bearing covered ambulacral grooves on ventral side, arm plates smooth on dorsal side, articulated to radials by single, short, primibrach