Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Agassizocrinus
Classification
Phylum:
Echinodermata
Class:
Crinoidea
Order:
Cladida
Superfamily:
Agassizocrinacea
Family:
Agassizocrinidae
Formal Genus Name and Reference:
Agassizocrinus Owen & SHUMARD, 1852, p. 93
Type Species:
* A. conicus, M
Images
(Click to enlarge in a new window)
Fig. 450, 2a. *A. conicus, Chester. (Okaw F.), Ill., ?AB-interray view of holotype, x1 (Springer, 1926b)., Fig. 450, 2b-f. A. laevis (Roemer), Chester., USA (Ky.-Ill.), 2b, A B interray view of crown (Roemer's type, much restored), from Okaw F., Ill., x0.7 (Kirk, 1911), 2 c, d, C D-interray and E-ray views of Roemer's holotype (unretouched photos) showing asymmetrical axillary primibrachs and stout unbranched arms, x1 (Springer, 1926b), 2e, f, A B - and C D interray views of cups from Glen Dean Ls., Hardin Co., Ky., x1 (Springer, 1926b).
Synonyms
Agassizocrinites; Astylocrinus
Geographic Distribution
U.Miss. (Chester.), USA (Okla.-Ark.-Ill.-Ky.-Ala.)
Age Range
Beginning Stage in Treatise Usage:
U.Miss. (Chester.)
Beginning International Stage:
Visean
Fraction Up In Beginning Stage:
65.1
Beginning Date:
336.06
Ending Stage in Treatise Usage:
U.Miss. (Chester.)
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Crown moderately tall, pyriform. Cup truncate ovoid, with well-rounded base, infrabasals mostly fused into thick, solid piece, but may show complete or incomplete sutures dividing 5 plates, basals large and thick, forming approximately vertical sides of cup, radials wide and low, C and D radials commonly narrower than others, with subhorizontal articular facet equal in length to thickness of plate, anal plates normally 4, including obliquely oriented quadrangular radianal. Arms 10, unequal, uniserial, composed of externally rectangular wellrounded brachials bearing closely spaced pinnules, arms branching on axillary first primibrach, which may have distinctly unequal distal facets. Stemless in adults.
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Class:
Crinoidea
Order:
Cladida
Superfamily:
Agassizocrinacea
Family:
Agassizocrinidae
Formal Genus Name and Reference:
Agassizocrinus Owen & SHUMARD, 1852, p. 93
Type Species:
* A. conicus, M
Images
(Click to enlarge in a new window)
Fig. 450, 2a. *A. conicus, Chester. (Okaw F.), Ill., ?AB-interray view of holotype, x1 (Springer, 1926b)., Fig. 450, 2b-f. A. laevis (Roemer), Chester., USA (Ky.-Ill.), 2b, A B interray view of crown (Roemer's type, much restored), from Okaw F., Ill., x0.7 (Kirk, 1911), 2 c, d, C D-interray and E-ray views of Roemer's holotype (unretouched photos) showing asymmetrical axillary primibrachs and stout unbranched arms, x1 (Springer, 1926b), 2e, f, A B - and C D interray views of cups from Glen Dean Ls., Hardin Co., Ky., x1 (Springer, 1926b).
Synonyms
Agassizocrinites; Astylocrinus
Geographic Distribution
U.Miss. (Chester.), USA (Okla.-Ark.-Ill.-Ky.-Ala.)
Age Range
Beginning Stage in Treatise Usage:
U.Miss. (Chester.)
Beginning International Stage:
Visean
Fraction Up In Beginning Stage:
65.1
Beginning Date:
336.06
Ending Stage in Treatise Usage:
U.Miss. (Chester.)
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Crown moderately tall, pyriform. Cup truncate ovoid, with well-rounded base, infrabasals mostly fused into thick, solid piece, but may show complete or incomplete sutures dividing 5 plates, basals large and thick, forming approximately vertical sides of cup, radials wide and low, C and D radials commonly narrower than others, with subhorizontal articular facet equal in length to thickness of plate, anal plates normally 4, including obliquely oriented quadrangular radianal. Arms 10, unequal, uniserial, composed of externally rectangular wellrounded brachials bearing closely spaced pinnules, arms branching on axillary first primibrach, which may have distinctly unequal distal facets. Stemless in adults.