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Agassizia
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sand dollars) - Superorder Atelostomata
Order:
Spatangoida
Suborder:
Hemiasterina
Family:
Schizasteridae
Formal Genus Name and Reference:
Agassizia AGASSIZ & DESOR, 1847, p . 20 [nom . correct. pro Agassisia VALENCIENNES in Du PETIT- THOUARS, 1846, pI. 1 (incorrect orig. spelling)]
Type Species:
*A. scrobieulata; OD
Images
(Click to enlarge in a new window)
Fig. 457,1. *A. (A.) scrobiculata, Rec., Medit., 1a, b, aboral, lat., X1(1), 1c, apical system, XIO; ld, detail of anterolateral petal, X10 (1e,d,136i)
Synonyms
Geographic Distribution
N.Am., Medit., Persian Gulf
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:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Egg-shaped, with ethmolytic apical system showing 4 gonopores and fused genital plates; frontal ambulacrum flush, petals slightly sunken and curiously modified; in anterior petals anterior plate row bearing tiny tube feet which emerge through microscopic pores, whereas pores of posterior plate row are normally developed; posterior petals much shorter and may be normal or similarly modified.
References
Museum or Author Information
Classification
Phylum:
Echinodermata
Subphylum:
Echinozoa (sea urchins, holothurians, etc.)
Class:
Echinoidea
Subclass:
Euechinoidea (sand dollars) - Superorder Atelostomata
Order:
Spatangoida
Suborder:
Hemiasterina
Family:
Schizasteridae
Formal Genus Name and Reference:
Agassizia AGASSIZ & DESOR, 1847, p . 20 [nom . correct. pro Agassisia VALENCIENNES in Du PETIT- THOUARS, 1846, pI. 1 (incorrect orig. spelling)]
Type Species:
*A. scrobieulata; OD
Images
(Click to enlarge in a new window)
Fig. 457,1. *A. (A.) scrobiculata, Rec., Medit., 1a, b, aboral, lat., X1(1), 1c, apical system, XIO; ld, detail of anterolateral petal, X10 (1e,d,136i)
Synonyms
Geographic Distribution
N.Am., Medit., Persian Gulf
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:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Egg-shaped, with ethmolytic apical system showing 4 gonopores and fused genital plates; frontal ambulacrum flush, petals slightly sunken and curiously modified; in anterior petals anterior plate row bearing tiny tube feet which emerge through microscopic pores, whereas pores of posterior plate row are normally developed; posterior petals much shorter and may be normal or similarly modified.