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Pholadella
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Anomalodesmata
Order:
Pholadomyoida
Superfamily:
Pholadomyacea
Family:
Grammysiidae
Formal Genus Name and Reference:
Pholadella HALL, 1869, p. 63
Type Species:
P. newberryi, SD HALL, 1885
Images
(Click to enlarge in a new window)
Fig. F3,1l. ·P. newberryi, L.Miss.(Waverly.), USA (Ohio); LV ext., X1 (379)
Synonyms
Cercomyopsis, Grammysiopsis
Geographic Distribution
L.Dev.(Coblenz.), Ger., L.Miss., E.USA, M.Penn.- U.Penn., C.USA; U.Carb., USSR(Urals
Age Range
Beginning Stage in Treatise Usage:
L.Dev.
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
U.Penn.
Ending International Stage:
Gzhelian
Fraction Up In Ending Stage:
100
Ending Date:
298.89
Description
Shell elongate, gibbous, beaks about 0.25 distance behind anterior margin, umbones and umbonal ridge prominent, anterior end rounded or obliquely truncate, laterally compressed posterior truncate, broad, lateral sulcus extending directly downward from beaks to ventral indentation, surface marked by strong concentric undulations which may be confined to anterior part of shell, distinct costae originating at umbo extend across central or greater portion of shell body, leaving anterior and cardinal area free of radial ornamentation, cardinal margin marked by broad ligament groove, lunule and escutcheon well defined, hinge, pallial and adductor impressions unknown
References
Hall, James, 1869, Preliminary notice of the lamellibranchiate shells of the upper Helderberg, Hamilton and Chemung groups, with oth- ers from the Waverly sandstones: pt. 2, 97 p., N.Y. State Museum (Albany).
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Anomalodesmata
Order:
Pholadomyoida
Superfamily:
Pholadomyacea
Family:
Grammysiidae
Formal Genus Name and Reference:
Pholadella HALL, 1869, p. 63
Type Species:
P. newberryi, SD HALL, 1885
Images
(Click to enlarge in a new window)
Fig. F3,1l. ·P. newberryi, L.Miss.(Waverly.), USA (Ohio); LV ext., X1 (379)
Synonyms
Cercomyopsis, Grammysiopsis
Geographic Distribution
L.Dev.(Coblenz.), Ger., L.Miss., E.USA, M.Penn.- U.Penn., C.USA; U.Carb., USSR(Urals
Age Range
Beginning Stage in Treatise Usage:
L.Dev.
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
U.Penn.
Ending International Stage:
Gzhelian
Fraction Up In Ending Stage:
100
Ending Date:
298.89
Description
Shell elongate, gibbous, beaks about 0.25 distance behind anterior margin, umbones and umbonal ridge prominent, anterior end rounded or obliquely truncate, laterally compressed posterior truncate, broad, lateral sulcus extending directly downward from beaks to ventral indentation, surface marked by strong concentric undulations which may be confined to anterior part of shell, distinct costae originating at umbo extend across central or greater portion of shell body, leaving anterior and cardinal area free of radial ornamentation, cardinal margin marked by broad ligament groove, lunule and escutcheon well defined, hinge, pallial and adductor impressions unknown
References
Hall, James, 1869, Preliminary notice of the lamellibranchiate shells of the upper Helderberg, Hamilton and Chemung groups, with oth- ers from the Waverly sandstones: pt. 2, 97 p., N.Y. State Museum (Albany).