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Astartella
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Crassatellacea
Family:
Astartidae
Subfamily:
Astartinae
Formal Genus Name and Reference:
Astartella HALL, 1858
Type Species:
A. vera Hall, 1858, SD MILLER, 1889
Images
(Click to enlarge in a new window)
Fig. E65,2a,b. *A. vera, Penn., USA, 2a, b, RV ext., both valves dorsal, X1 (Hall, 1858). -- Fig. E65,2c,d. A. concentrica (Conrad), Penn., USA (Mo.), 2c d, LV and RV hinges, X1.3 (Girty, 1927). [See also Fig. E75,2.]
Synonyms
Geographic Distribution
Eu.-N.Am.-?Australia
Age Range
Beginning Stage in Treatise Usage:
U.Carb.(Penn.)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Transversely rhomboidal to ovate, thick, rather small, laterally truncated. Surface with concentric furrows and distant lamellae. Cordiform impressed lunule. Valves margin crenulate. RV hinge with narrow, trigonal 3b, oblique 5b, and marginal laterals, LV hinge with 2 partly fused as hook with raised (AII) lunular margin, 4b, strong, broad and oblique, and PII elongate. Scars small.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Crassatellacea
Family:
Astartidae
Subfamily:
Astartinae
Formal Genus Name and Reference:
Astartella HALL, 1858
Type Species:
A. vera Hall, 1858, SD MILLER, 1889
Images
(Click to enlarge in a new window)
Fig. E65,2a,b. *A. vera, Penn., USA, 2a, b, RV ext., both valves dorsal, X1 (Hall, 1858). -- Fig. E65,2c,d. A. concentrica (Conrad), Penn., USA (Mo.), 2c d, LV and RV hinges, X1.3 (Girty, 1927). [See also Fig. E75,2.]
Synonyms
Geographic Distribution
Eu.-N.Am.-?Australia
Age Range
Beginning Stage in Treatise Usage:
U.Carb.(Penn.)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Transversely rhomboidal to ovate, thick, rather small, laterally truncated. Surface with concentric furrows and distant lamellae. Cordiform impressed lunule. Valves margin crenulate. RV hinge with narrow, trigonal 3b, oblique 5b, and marginal laterals, LV hinge with 2 partly fused as hook with raised (AII) lunular margin, 4b, strong, broad and oblique, and PII elongate. Scars small.