Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Paracyclas
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Lucinacea
Family:
Mactromyidae
Formal Genus Name and Reference:
Paracyclas HALL, 1843
Type Species:
*P. elliptica (=Lucina proavia GOLDFUSS, 1840), OD
Images
(Click to enlarge in a new window)
Fig. E15,5. P. marginata (MAURER), Ger.; 5a,b, LV hinges, enl. (Chavan after Maurer)
Synonyms
Geographic Distribution
N. Am. - Eu.
Age Range
Beginning Stage in Treatise Usage:
Dev.
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
Dev.
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Ovate, beaks low, surface with concentric ribs, RV hinge apparently with 2 oblique superposed rounded tubercles separated by sockets, superior one smaller than inferior, flat area in front of them and possibly linear anterior lateral, broad and long ligament depression, anterior muscle scars elliptical
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Lucinacea
Family:
Mactromyidae
Formal Genus Name and Reference:
Paracyclas HALL, 1843
Type Species:
*P. elliptica (=Lucina proavia GOLDFUSS, 1840), OD
Images
(Click to enlarge in a new window)
Fig. E15,5. P. marginata (MAURER), Ger.; 5a,b, LV hinges, enl. (Chavan after Maurer)
Synonyms
Geographic Distribution
N. Am. - Eu.
Age Range
Beginning Stage in Treatise Usage:
Dev.
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
Dev.
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Ovate, beaks low, surface with concentric ribs, RV hinge apparently with 2 oblique superposed rounded tubercles separated by sockets, superior one smaller than inferior, flat area in front of them and possibly linear anterior lateral, broad and long ligament depression, anterior muscle scars elliptical