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Heterodiadema
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sea urchins) - superorder Echinacea
Order:
Hemicidaroida
Family:
Hemicidaridae
Formal Genus Name and Reference:
Heterodiadema COTTEAU, 1864, p. 75
Type Species:
*Hemicidaris libyca Desor, 1846, p. 338, SD Lambert & THIÉRY, 1910, p. 180
Images
(Click to enlarge in a new window)
Fig. 286,1. *H libycum (Desor), Turon., N.Afr., 1a-c, test aboral, lat., oral, X1; 1d,e, amb, amb detail, X2, X4;
1f-h, spines, X4 (27a)
Synonyms
Geographic Distribution
S.Eu.-N.Afr.-Tex.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Cenoman.)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
U.Cret.(uron.)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Test low, hemispherical, or higher, apical system caducous, produced posteriorly, ambs with trigeminate plates, spines small, but with distinct collar
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sea urchins) - superorder Echinacea
Order:
Hemicidaroida
Family:
Hemicidaridae
Formal Genus Name and Reference:
Heterodiadema COTTEAU, 1864, p. 75
Type Species:
*Hemicidaris libyca Desor, 1846, p. 338, SD Lambert & THIÉRY, 1910, p. 180
Images
(Click to enlarge in a new window)
Fig. 286,1. *H libycum (Desor), Turon., N.Afr., 1a-c, test aboral, lat., oral, X1; 1d,e, amb, amb detail, X2, X4;
1f-h, spines, X4 (27a)
Synonyms
Geographic Distribution
S.Eu.-N.Afr.-Tex.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Cenoman.)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
U.Cret.(uron.)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Test low, hemispherical, or higher, apical system caducous, produced posteriorly, ambs with trigeminate plates, spines small, but with distinct collar