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Gissarina
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Athyridida
Suborder:
Athyrididina
Superfamily:
Retzielloidea
Family:
Retziellidae
Formal Genus Name and Reference:
Gissarina MENAKOVA & NIKIFOROVA , 1986, p. 71
Type Species:
Parazyga ? argensis NIKIFOROVA, 1949, p. 19; OD
Images
(Click to enlarge in a new window)
Fig. 1077, 7a–s. *G. argensis (NIKIFOROVA); a–d, holotype, dorsal, ventral, lateral, and anterior views, TsNIGRA 4/8639, ×2 (Nikiforova, 1949; photographs courtesy of T. L. Modzalevskaya); e–j, transverse serial sections showing umbonal regions 0.2, 0.55, 0.80, 0.95, 1.00, 1.45 mm from ventral umbo, distance from ventral umbo to first section approximate, TsNIGRA 19/6228; k–q, transverse serial sections showing cardinalia and brachidium 0.6, 1.2, 1.5, 2.25, 3.50, 4.90, 5.30 mm from ventral umbo, distance from ventral umbo to first section approximate, TsNIGRA 20/6228 (adapted r–s, ventral and lateral views of reconstructed jugum (Menakova & Nikiforova, 1986).
Synonyms
Geographic Distribution
Tajikistan
Age Range
Beginning Stage in Treatise Usage:
Silurian (Prídolí)
Beginning International Stage:
Pridoli
Fraction Up In Beginning Stage:
0
Beginning Date:
422.73
Ending Stage in Treatise Usage:
Silurian (Prídolí)
Ending International Stage:
Pridoli
Fraction Up In Ending Stage:
100
Ending Date:
419
Description
Similar to Retziella but sulcus may develop in both valves; delthyrium covered by deltidial plates; septalium and median septum extremely short or absent.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Athyridida
Suborder:
Athyrididina
Superfamily:
Retzielloidea
Family:
Retziellidae
Formal Genus Name and Reference:
Gissarina MENAKOVA & NIKIFOROVA , 1986, p. 71
Type Species:
Parazyga ? argensis NIKIFOROVA, 1949, p. 19; OD
Images
(Click to enlarge in a new window)
Fig. 1077, 7a–s. *G. argensis (NIKIFOROVA); a–d, holotype, dorsal, ventral, lateral, and anterior views, TsNIGRA 4/8639, ×2 (Nikiforova, 1949; photographs courtesy of T. L. Modzalevskaya); e–j, transverse serial sections showing umbonal regions 0.2, 0.55, 0.80, 0.95, 1.00, 1.45 mm from ventral umbo, distance from ventral umbo to first section approximate, TsNIGRA 19/6228; k–q, transverse serial sections showing cardinalia and brachidium 0.6, 1.2, 1.5, 2.25, 3.50, 4.90, 5.30 mm from ventral umbo, distance from ventral umbo to first section approximate, TsNIGRA 20/6228 (adapted r–s, ventral and lateral views of reconstructed jugum (Menakova & Nikiforova, 1986).
Synonyms
Geographic Distribution
Tajikistan
Age Range
Beginning Stage in Treatise Usage:
Silurian (Prídolí)
Beginning International Stage:
Pridoli
Fraction Up In Beginning Stage:
0
Beginning Date:
422.73
Ending Stage in Treatise Usage:
Silurian (Prídolí)
Ending International Stage:
Pridoli
Fraction Up In Ending Stage:
100
Ending Date:
419
Description
Similar to Retziella but sulcus may develop in both valves; delthyrium covered by deltidial plates; septalium and median septum extremely short or absent.