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Porosoma
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sea urchins) - superorder Echinacea
Order:
Phymosomatoida
Family:
Phymosomatidae
Formal Genus Name and Reference:
Porosoma COTTEAU, 1856, p. 648
Type Species:
*Cyphosoma cribrum L. Agassiz, SD MORTENSEN, 1935, p. 474
Images
(Click to enlarge in a new window)
Fig. 295,1a-c. *P. cribrum (Agassiz), Eoc., Fr., 1a,b, test, aboral, oral, X1 (27e), 1c, adoral part of amb, X2.7(27e)
Synonyms
Coptosoma, Microsoma, Euporophyma
Geographic Distribution
Eu., N. Afr., S.Afr., N.Am.
Age Range
Beginning Stage in Treatise Usage:
L. Cret.(Neocom.)
Beginning International Stage:
Berriasian
Fraction Up In Beginning Stage:
0
Beginning Date:
143.1
Ending Stage in Treatise Usage:
Oligo.
Ending International Stage:
Chattian
Fraction Up In Ending Stage:
100
Ending Date:
23.04
Description
Amb plates compound, polyporous, pores in single series only, Apical system small, only ocular I insert, Test of moderate size, low hemispherical
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sea urchins) - superorder Echinacea
Order:
Phymosomatoida
Family:
Phymosomatidae
Formal Genus Name and Reference:
Porosoma COTTEAU, 1856, p. 648
Type Species:
*Cyphosoma cribrum L. Agassiz, SD MORTENSEN, 1935, p. 474
Images
(Click to enlarge in a new window)
Fig. 295,1a-c. *P. cribrum (Agassiz), Eoc., Fr., 1a,b, test, aboral, oral, X1 (27e), 1c, adoral part of amb, X2.7(27e)
Synonyms
Coptosoma, Microsoma, Euporophyma
Geographic Distribution
Eu., N. Afr., S.Afr., N.Am.
Age Range
Beginning Stage in Treatise Usage:
L. Cret.(Neocom.)
Beginning International Stage:
Berriasian
Fraction Up In Beginning Stage:
0
Beginning Date:
143.1
Ending Stage in Treatise Usage:
Oligo.
Ending International Stage:
Chattian
Fraction Up In Ending Stage:
100
Ending Date:
23.04
Description
Amb plates compound, polyporous, pores in single series only, Apical system small, only ocular I insert, Test of moderate size, low hemispherical