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Hemipneustes
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sand dollars) - Superorder Atelostomata
Order:
Holasteroida
Family:
Holasteridae
Formal Genus Name and Reference:
Hemipneustes AGASSIZ, 1836, p. 183
Type Species:
*Spatangus radiatus Lamarck, 1840, p. 331 ( = *Spatangus striatoradiatus LESKE, 1778, p. 234), OD
Images
(Click to enlarge in a new window)
Fig. 417,1. *H. striatoradiatus (Leske), Senon., Fr., 1 a, b, aboral, oral, X0.5 (142)
Synonyms
Geographic Distribution
Eu., N.Afr., Madag., India.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Senon.)
Beginning International Stage:
Coniacian
Fraction Up In Beginning Stage:
0
Beginning Date:
89.39
Ending Stage in Treatise Usage:
U.Cret.(Maastricht.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Ambulacrum III sunken, pores small, round, paired ambulacra subpetaloid, anterior pore series small, round, posterior pore series with inner pore small, round, and outer pore elongate, peristome semilunar, labrum well marked, prominent phyllodes, plastron of large, cuneiform, alternating plates, no fascioles
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sand dollars) - Superorder Atelostomata
Order:
Holasteroida
Family:
Holasteridae
Formal Genus Name and Reference:
Hemipneustes AGASSIZ, 1836, p. 183
Type Species:
*Spatangus radiatus Lamarck, 1840, p. 331 ( = *Spatangus striatoradiatus LESKE, 1778, p. 234), OD
Images
(Click to enlarge in a new window)
Fig. 417,1. *H. striatoradiatus (Leske), Senon., Fr., 1 a, b, aboral, oral, X0.5 (142)
Synonyms
Geographic Distribution
Eu., N.Afr., Madag., India.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Senon.)
Beginning International Stage:
Coniacian
Fraction Up In Beginning Stage:
0
Beginning Date:
89.39
Ending Stage in Treatise Usage:
U.Cret.(Maastricht.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Ambulacrum III sunken, pores small, round, paired ambulacra subpetaloid, anterior pore series small, round, posterior pore series with inner pore small, round, and outer pore elongate, peristome semilunar, labrum well marked, prominent phyllodes, plastron of large, cuneiform, alternating plates, no fascioles