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Asmussia
Classification
Phylum:
Arthropoda
Subphylum:
Crustacea (superclass)
Class:
Branchiopoda
Subclass:
Diplostraca
Order:
Conchostraca
Suborder:
Spinicaudata
Superfamily:
Cyzicoidea
Family:
Asmussiidae
Subfamily:
Asmussiinae
Formal Genus Name and Reference:
Asmussia PACHT, 1849
Type Species:
*A. membranacea, OD
Images
(Click to enlarge in a new window)
Fig. 51,1. *A. membranacea, Dev., Livonia, left valve, ×12 (53)
Synonyms
Posidonomya, Estheria, Erisopsis, Orthothemos, Loxomicroglypta, Cyclograpta, Levenkia, Glyptoasmussia, Loxopolygrapta, Loxomegaglypta
Geographic Distribution
Eu. (G. Brit.-USSR), Asia(China), N. Am.(USA)
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.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Carapace subovate, hinge line straight, beak subcentral, number of concentric growth lines variable, ranging from 13 to 30 or more, interspaces bearing reticulate pattern
References
Pacht, Raimund, 1849, Der devonische Kalk in Livland; Ein Beitrag zur Geognosie der Ostseeprovinzen: 52 p. (Dorpat).
Museum or Author Information
Classification
Phylum:
Arthropoda
Subphylum:
Crustacea (superclass)
Class:
Branchiopoda
Subclass:
Diplostraca
Order:
Conchostraca
Suborder:
Spinicaudata
Superfamily:
Cyzicoidea
Family:
Asmussiidae
Subfamily:
Asmussiinae
Formal Genus Name and Reference:
Asmussia PACHT, 1849
Type Species:
*A. membranacea, OD
Images
(Click to enlarge in a new window)
Fig. 51,1. *A. membranacea, Dev., Livonia, left valve, ×12 (53)
Synonyms
Posidonomya, Estheria, Erisopsis, Orthothemos, Loxomicroglypta, Cyclograpta, Levenkia, Glyptoasmussia, Loxopolygrapta, Loxomegaglypta
Geographic Distribution
Eu. (G. Brit.-USSR), Asia(China), N. Am.(USA)
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.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Carapace subovate, hinge line straight, beak subcentral, number of concentric growth lines variable, ranging from 13 to 30 or more, interspaces bearing reticulate pattern
References
Pacht, Raimund, 1849, Der devonische Kalk in Livland; Ein Beitrag zur Geognosie der Ostseeprovinzen: 52 p. (Dorpat).