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Ketmenia
Classification
Phylum:
Arthropoda
Subphylum:
Crustacea (superclass)
Class:
Branchiopoda
Subclass:
Calmanostraca
Order:
Kazacharthra
Family:
Ketmeniidae
Formal Genus Name and Reference:
Ketmenia CHERNYSHEV, 1940
Type Species:
*K. schultzi, OD
Images
(Click to enlarge in a new window)
Fig. 45,5. *K. schultzi, Ketmen Mts., 5a, elongated abdomen and telson, × 2 (25, 97); 56, shield, ×1.25 (25,97)
Synonyms
Geographic Distribution
USSR(SE.Kazakh.)
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Lias.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
L.Jur.(Lias.)
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Anterior margin of shield rectilinear or slightly recurved, posterior margin largely concave, spines developed on posterior lateral margins. Flattened, subtriangular bulge with equal sides on median portion of shield. Large, flat telson shaped like truncated ellipse, with spines on lateral margin and on posterior margins of dorsal and ventral surfaces
References
Museum or Author Information
Classification
Phylum:
Arthropoda
Subphylum:
Crustacea (superclass)
Class:
Branchiopoda
Subclass:
Calmanostraca
Order:
Kazacharthra
Family:
Ketmeniidae
Formal Genus Name and Reference:
Ketmenia CHERNYSHEV, 1940
Type Species:
*K. schultzi, OD
Images
(Click to enlarge in a new window)
Fig. 45,5. *K. schultzi, Ketmen Mts., 5a, elongated abdomen and telson, × 2 (25, 97); 56, shield, ×1.25 (25,97)
Synonyms
Geographic Distribution
USSR(SE.Kazakh.)
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Lias.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
L.Jur.(Lias.)
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Anterior margin of shield rectilinear or slightly recurved, posterior margin largely concave, spines developed on posterior lateral margins. Flattened, subtriangular bulge with equal sides on median portion of shield. Large, flat telson shaped like truncated ellipse, with spines on lateral margin and on posterior margins of dorsal and ventral surfaces