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Schizaster
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sand dollars) - Superorder Atelostomata
Order:
Spatangoida
Suborder:
Hemiasterina
Family:
Schizasteridae
Formal Genus Name and Reference:
Schizaster L. AGASSIZ, 1836, p. 185
Type Species:
*S. studeri, SD ICZN Op. 209, 1948
Images
(Click to enlarge in a new window)
Fig. 454,2. *S. (S.) studeri, Eoc., Fr., 2a-e, aboral, oral, lat., X1.5 (27e)
Synonyms
Brachybrissus, Aplospatangus
Geographic Distribution
cosmop
Age Range
Beginning Stage in Treatise Usage:
Eoc.
Beginning International Stage:
Ypresian
Fraction Up In Beginning Stage:
0
Beginning Date:
56
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test high, sloping anteriorly from posterior vertex, beaked over periproct, ambulacra sunken, frontal one deeply depressed, posterior petals 0.3 to 0.5 as long as anterior pair, apical system ethmolytic with 2 to 4 gonopores
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sand dollars) - Superorder Atelostomata
Order:
Spatangoida
Suborder:
Hemiasterina
Family:
Schizasteridae
Formal Genus Name and Reference:
Schizaster L. AGASSIZ, 1836, p. 185
Type Species:
*S. studeri, SD ICZN Op. 209, 1948
Images
(Click to enlarge in a new window)
Fig. 454,2. *S. (S.) studeri, Eoc., Fr., 2a-e, aboral, oral, lat., X1.5 (27e)
Synonyms
Brachybrissus, Aplospatangus
Geographic Distribution
cosmop
Age Range
Beginning Stage in Treatise Usage:
Eoc.
Beginning International Stage:
Ypresian
Fraction Up In Beginning Stage:
0
Beginning Date:
56
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test high, sloping anteriorly from posterior vertex, beaked over periproct, ambulacra sunken, frontal one deeply depressed, posterior petals 0.3 to 0.5 as long as anterior pair, apical system ethmolytic with 2 to 4 gonopores