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Opissaster

Classification

    Phylum:  
Echinodermata
    Subphylum:  
Echinozoa (sea urchins, holothurians, etc.)
    Class:  
Echinoidea
    Subclass:  
Euechinoidea (sand dollars) - Superorder Atelostomata
    Order:  
Spatangoida
    Suborder:  
Hemiasterina
    Family:  
Hemiasteridae
    Formal Genus Name and Reference:  
Opissaster POMEL, 1883, p. 37
    Type Species:  
*O. polygonalis, OD


Images

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Fig. 445,2. *O. polygonalis, Mio., N.Afr. (Alg.), 2a-c, aboral, oral, lat., X1 (136h)


Synonyms



Geographic Distribution

Medit., India, Carib.


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:  
Plio.
    Ending International Stage:  
Piacenzian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
2.58


Description

Outline ovoid, deep frontal sinus, deeply depressed petals, apical system ethmolytic, with 2 to 4 gonopores




References

Pomel, Auguste, 1883, Classification méthodique et genera des Échinides vivants et fossiles: 131 p., 1 pl ., Adolphe Jourdan (Alger).


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