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Amphoracrinus
Classification
Phylum:
Echinodermata
Subphylum:
Crinozoa
Class:
Crinoidea
Subclass:
Camerata
Order:
Monobathrida
Suborder:
Compsocrinina
Superfamily:
Periechocrinacea
Family:
Amphoracrinidae
Formal Genus Name and Reference:
Amphoracrinus AUSTIN, 1848, p. 292
Type Species:
Actinocrinus gilbertsoni MILLER in PHILLIPS, 1836, p. 206; SD ROEMER, 1855, p. 250
Images
(Click to enlarge in a new window)
Fig. 260,1. *A. gilbertsoni (MILLER), L.Carb., Eng.; 1a-c, A-ray, CD-interray, and ven* tral views of neotype theca (anal tube lacking), X 1 (Wright, 1955-60); /d, BC-interray view of another specimen, with anal tube partly preserved, X 1 (Wright, 1955-60)
Synonyms
Geographic Distribution
L.Carb .. Eu.; ?Japan; U.Carb.(low.Namur.), N.Afr.; Miss. N.Am
Age Range
Beginning Stage in Treatise Usage:
L.Carb.
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
U.Carb.(low.Namur.)
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Calyx high or low, rounded or conical; fixed secundibrachs 2 in each half-ray; primanal typically followed by 2 or rarely 3 plates. Tegmen usually more than calyx in height, but may be equal to or less than this, tapering upward and prominently lobed, generally flat summit occupied by 5 orals, 4 of which form semicircle enclosing larger posterior one; anal tub( excentric on distal side of posterior oral.
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Subphylum:
Crinozoa
Class:
Crinoidea
Subclass:
Camerata
Order:
Monobathrida
Suborder:
Compsocrinina
Superfamily:
Periechocrinacea
Family:
Amphoracrinidae
Formal Genus Name and Reference:
Amphoracrinus AUSTIN, 1848, p. 292
Type Species:
Actinocrinus gilbertsoni MILLER in PHILLIPS, 1836, p. 206; SD ROEMER, 1855, p. 250
Images
(Click to enlarge in a new window)
Fig. 260,1. *A. gilbertsoni (MILLER), L.Carb., Eng.; 1a-c, A-ray, CD-interray, and ven* tral views of neotype theca (anal tube lacking), X 1 (Wright, 1955-60); /d, BC-interray view of another specimen, with anal tube partly preserved, X 1 (Wright, 1955-60)
Synonyms
Geographic Distribution
L.Carb .. Eu.; ?Japan; U.Carb.(low.Namur.), N.Afr.; Miss. N.Am
Age Range
Beginning Stage in Treatise Usage:
L.Carb.
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
U.Carb.(low.Namur.)
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Calyx high or low, rounded or conical; fixed secundibrachs 2 in each half-ray; primanal typically followed by 2 or rarely 3 plates. Tegmen usually more than calyx in height, but may be equal to or less than this, tapering upward and prominently lobed, generally flat summit occupied by 5 orals, 4 of which form semicircle enclosing larger posterior one; anal tub( excentric on distal side of posterior oral.