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Pygaster
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea - superorder Diadematacea
Order:
Pygasteroida
Family:
Pygasteridae
Formal Genus Name and Reference:
Pygaster J. L. R. AGASSIZ, 1836, p. 18
Type Species:
Clypeus semisulcatus Phillips, 1829, SD SAVIN, 1905, p. 187
Images
(Click to enlarge in a new window)
Fig. 269,1a-c, 270,1. *P. semisulcatus (Phillips), U. Oxford., Eng., 269,1a,b, aboral, oral, X0.7 (172), 269,1c, lat., X1.1 (172), 270,1a, adoral portion of ambulacrum, enl. (81), 270,16 , apical system, X2.5 (172).-Fig. 269,1d. P. trigeri Cotteau, Bathon., Fr., cross section of tooth, X45 (131).
Synonyms
Macropygus, ?Echinoclypus, Megapygus
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
M. lur.(Bajoc.)
Beginning International Stage:
Bajocian
Fraction Up In Beginning Stage:
0
Beginning Date:
170.9
Ending Stage in Treatise Usage:
U. Cret.(Cenoman.)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Medium-sized, more or less depressed, apical system in contact with periproct, but genital 5 missing, and genital 3 with oculars II, III, and IV excluded, pore pairs uniserial throughout, or very weakly triserial adorally, elongated pits in transverse sutures of adoral interambulacral plates
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea - superorder Diadematacea
Order:
Pygasteroida
Family:
Pygasteridae
Formal Genus Name and Reference:
Pygaster J. L. R. AGASSIZ, 1836, p. 18
Type Species:
Clypeus semisulcatus Phillips, 1829, SD SAVIN, 1905, p. 187
Images
(Click to enlarge in a new window)
Fig. 269,1a-c, 270,1. *P. semisulcatus (Phillips), U. Oxford., Eng., 269,1a,b, aboral, oral, X0.7 (172), 269,1c, lat., X1.1 (172), 270,1a, adoral portion of ambulacrum, enl. (81), 270,16 , apical system, X2.5 (172).-Fig. 269,1d. P. trigeri Cotteau, Bathon., Fr., cross section of tooth, X45 (131).
Synonyms
Macropygus, ?Echinoclypus, Megapygus
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
M. lur.(Bajoc.)
Beginning International Stage:
Bajocian
Fraction Up In Beginning Stage:
0
Beginning Date:
170.9
Ending Stage in Treatise Usage:
U. Cret.(Cenoman.)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Medium-sized, more or less depressed, apical system in contact with periproct, but genital 5 missing, and genital 3 with oculars II, III, and IV excluded, pore pairs uniserial throughout, or very weakly triserial adorally, elongated pits in transverse sutures of adoral interambulacral plates