Home Plot Diversity Curves Tree of Life About Admin Login

Welcome to the Treatise on Invertebrate Paleontology!

Please enter a genera name to retrieve more information.

Search By:
and Class
and Order

Whitfieldella

Classification

    Phylum:  
Brachiopoda
    Class:  
Rhynchonellata
    Order:  
Athyridida
    Superfamily:  
Meristelloidea
    Family:  
Meristellidae
    Formal Genus Name and Reference:  
Whitfieldella Hall & CLARKE, 1893, p. 58
    Type Species:  
Atrypa nitida HALL, 1843, Table 14, 5, OD (note that the figure on p. 12 is erroneously numbered as 13 when it should be 14, see Hall figure explanations)


Images

(Click to enlarge in a new window)

Fossil Image
Fig. 1066, 2a-s. *W. nitida (Hall), Silurian, New York, USA, $a-e$, lectotype, dorsal, ventral, lateral, anterior, and posterior views, AMNH 31290, Hall collection, x3$, $f$ - $h$, dorsal, ventral, and posterior views, AMNH 40799, Hall collection, x1$ (Alvarez & Brime, 2000), $i-r$, transverse serial sections 2.9, $3.1, 3.5, 4.6, 7.5, 7.6, 8.1, 8.4, 9.3, 10.5 \\mathrm{~mm}$ from ventral umbo, GSC 98796 (adapted from Jin, Caldwell, & Norford, 1993), s, lateral view showing jugum (Glass, 1882).


Synonyms



Geographic Distribution

south-central USA, Tadzhikistan, southwestern China (Guizhou), Ashgill; North America, Europe, Siberia, southern China, Silurian; North America, ?Lochkovian.


Age Range

    Beginning Stage in Treatise Usage:  
Upper Ordovician (Ashgill)
    Beginning International Stage:  
Katian
    Fraction Up In Beginning Stage:  
66.7
    Beginning Date:  
447.72
    Ending Stage in Treatise Usage:  
Silurian, Lower Devonian (?Lochkovian)
    Ending International Stage:  
Lochkovian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
412.4


Description

Biconvex, elongate trigonal to subpentagonal, with or without faint sulcus on both valves, lateral branches of jugum originating at approximately midlength of dorsal valve, vertical or projecting backward at high angle.




References



Museum or Author Information

AMNH, GSC, Alvarez & Brime, 2000, adapted from Jin, Caldwell, & Norford, 1993, Glass, 1882