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Xenocrinus
Classification
Phylum:
Echinodermata
Subphylum:
Crinozoa
Class:
Crinoidea
Subclass:
Camerata
Order:
Monobathrida
Suborder:
Compsocrinina
Superfamily:
Xenocrinacea
Family:
Xenocrinidae
Formal Genus Name and Reference:
Xenocrinus S. A. MILLER, 1881, p. 71
Type Species:
X. penicillus, M
Images
(Click to enlarge in a new window)
Fig. 249, 1. *X. penicillus, Richmond., USA (Ohio), 1 a, b, C D interray and D-ray views of crowns, x2 (Wachsmuth & Springer, 1897), 1c, plate diagram of part of calyx and arms (radials black, anal plates stippled) (Ubaghs, n)
Synonyms
Geographic Distribution
N.Am. (USA)-Eu. (Scot.)
Age Range
Beginning Stage in Treatise Usage:
U.Ord.
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Characters of family = Median ray and anal ridges conspicuous; radials usually adjoining each other in all interrays except posterior; sutures between some adjacent radials covered by small supplementary plates; fixed secundibrachs two, if there is further division, otherwise three to four to each half ray; few fixed tertibrachs may be present; interbrachial areas depressed, flexible, composed of many small and irregular plates; CD interray with radial-like primanal and median anitaxis of prominent convex plates. Free arms 2, 3 or 4 per ray, unbranched, uniserial or composed of cuneiform and interlocking brachials. Stem quadrangular in cross section, with pentagonal axial canal.
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Subphylum:
Crinozoa
Class:
Crinoidea
Subclass:
Camerata
Order:
Monobathrida
Suborder:
Compsocrinina
Superfamily:
Xenocrinacea
Family:
Xenocrinidae
Formal Genus Name and Reference:
Xenocrinus S. A. MILLER, 1881, p. 71
Type Species:
X. penicillus, M
Images
(Click to enlarge in a new window)
Fig. 249, 1. *X. penicillus, Richmond., USA (Ohio), 1 a, b, C D interray and D-ray views of crowns, x2 (Wachsmuth & Springer, 1897), 1c, plate diagram of part of calyx and arms (radials black, anal plates stippled) (Ubaghs, n)
Synonyms
Geographic Distribution
N.Am. (USA)-Eu. (Scot.)
Age Range
Beginning Stage in Treatise Usage:
U.Ord.
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Characters of family = Median ray and anal ridges conspicuous; radials usually adjoining each other in all interrays except posterior; sutures between some adjacent radials covered by small supplementary plates; fixed secundibrachs two, if there is further division, otherwise three to four to each half ray; few fixed tertibrachs may be present; interbrachial areas depressed, flexible, composed of many small and irregular plates; CD interray with radial-like primanal and median anitaxis of prominent convex plates. Free arms 2, 3 or 4 per ray, unbranched, uniserial or composed of cuneiform and interlocking brachials. Stem quadrangular in cross section, with pentagonal axial canal.