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Isocrinus
Classification
Phylum:
Echinodermata
Class:
Crinoidea
Order:
Isocrinida
Superfamily:
Unknown
Family:
Isocrinidae
Formal Genus Name and Reference:
Isocrinus von Meyer in AGASSIZ, 1836, p. 195
Type Species:
Isocrinites pendulus von Meyer, 1836, p. 57, M, =?Pentacrinus amblyscalaris Thurmann in Thurmann & ÉTALLON, 1861, p. 351
Images
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Synonyms
Pentacrinus amblyscalaris; Isocrinites
Geographic Distribution
Europe, Russia, Crimea, Caucasus, Japan
Age Range
Beginning Stage in Treatise Usage:
Upper Triassic (?Carnian), Lower Jurassic
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Lower Cretaceous
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Basals small, visible from outside, not forming contiguous circlet, Columnals low, except in distalmost part of column, cirrus sockets large, as high as nodals. [The type species, I. pendulus, is based on a crown that originally had a fragment of column attached and was so figured by von Meyer, but this fragment was subsequently lost (de loriol, 1887 in 1882–1889, p. 246 and pl. 174,3). It is extremely probable that the crown belongs to the same species as the numerous columnals of I. amblyscalaris ( tHurMann) from coeval sediments ( de Loriol , 1887 in 1882–1889, p. 247; H ess , 1972a, p. 198).]
References
Agassiz, J. L. R. 1836. Prodrome d'une Monographie des Radiaires ou Echinodermes. Mémoires de la Société d'histoire naturelle de Neuchâtel, 1 REFERENCES, :168-199, 5 pl.
Museum or Author Information
Classification
Phylum:
Echinodermata
Class:
Crinoidea
Order:
Isocrinida
Superfamily:
Unknown
Family:
Isocrinidae
Formal Genus Name and Reference:
Isocrinus von Meyer in AGASSIZ, 1836, p. 195
Type Species:
Isocrinites pendulus von Meyer, 1836, p. 57, M, =?Pentacrinus amblyscalaris Thurmann in Thurmann & ÉTALLON, 1861, p. 351
Images
(Click to enlarge in a new window)Synonyms
Pentacrinus amblyscalaris; Isocrinites
Geographic Distribution
Europe, Russia, Crimea, Caucasus, Japan
Age Range
Beginning Stage in Treatise Usage:
Upper Triassic (?Carnian), Lower Jurassic
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Lower Cretaceous
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Basals small, visible from outside, not forming contiguous circlet, Columnals low, except in distalmost part of column, cirrus sockets large, as high as nodals. [The type species, I. pendulus, is based on a crown that originally had a fragment of column attached and was so figured by von Meyer, but this fragment was subsequently lost (de loriol, 1887 in 1882–1889, p. 246 and pl. 174,3). It is extremely probable that the crown belongs to the same species as the numerous columnals of I. amblyscalaris ( tHurMann) from coeval sediments ( de Loriol , 1887 in 1882–1889, p. 247; H ess , 1972a, p. 198).]
References
Agassiz, J. L. R. 1836. Prodrome d'une Monographie des Radiaires ou Echinodermes. Mémoires de la Société d'histoire naturelle de Neuchâtel, 1 REFERENCES, :168-199, 5 pl.