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Gemmichara
Classification
Phylum:
Charophyta
Class:
Charophyceae
Order:
Moellerinales
Superfamily:
Unknown
Family:
Moellerinaceae
Formal Genus Name and Reference:
Gemmichara Z. WANG, 1984, p. 55
Type Species:
^* G. sinensis Z. WANG, 1984, p. 55, pl. I, 1-7, OD
Images
(Click to enlarge in a new window)
Fig. 44,2 a-c . * G. sinensis Wang, upper Permian, a, holotype, lateral view, NIGP PB11279, x50, b, apical view, x60, c, basal view, x50 (Z. Wang, 1984, pl. I,2, 1,5)
Synonyms
Geographic Distribution
Carboniferous (Mississippian)-upper Permian: China
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Mississippian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
0
Ending Date:
251.9
Description
Gyrogonites with 8 to 9 dextrally spiralled cells and no coronula cells, Shape bulbiform, Apical area drawn into an elongated neck, apical pore small or closed, Basal area rounded, basal pore large. [Gemmichara is the youngest known Moellerinales. WANG regarded this genus as the final step in a lineage starting in the Devonian with Moellerina. The lineage is defined by both the decrease in cell number and the closure of the apical pore. The latter feature seems to be linked to the tightness of the spiral cells, which are strongly stretched at the apex. A space (possibly a pore) between the apical ends of the spiral cells is visible on an internal mold of G. sinensis (Z. WANG,
1984, pl. I,3)].
References
Museum or Author Information
Classification
Phylum:
Charophyta
Class:
Charophyceae
Order:
Moellerinales
Superfamily:
Unknown
Family:
Moellerinaceae
Formal Genus Name and Reference:
Gemmichara Z. WANG, 1984, p. 55
Type Species:
^* G. sinensis Z. WANG, 1984, p. 55, pl. I, 1-7, OD
Images
(Click to enlarge in a new window)
Fig. 44,2 a-c . * G. sinensis Wang, upper Permian, a, holotype, lateral view, NIGP PB11279, x50, b, apical view, x60, c, basal view, x50 (Z. Wang, 1984, pl. I,2, 1,5)
Synonyms
Geographic Distribution
Carboniferous (Mississippian)-upper Permian: China
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Mississippian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
0
Ending Date:
251.9
Description
Gyrogonites with 8 to 9 dextrally spiralled cells and no coronula cells, Shape bulbiform, Apical area drawn into an elongated neck, apical pore small or closed, Basal area rounded, basal pore large. [Gemmichara is the youngest known Moellerinales. WANG regarded this genus as the final step in a lineage starting in the Devonian with Moellerina. The lineage is defined by both the decrease in cell number and the closure of the apical pore. The latter feature seems to be linked to the tightness of the spiral cells, which are strongly stretched at the apex. A space (possibly a pore) between the apical ends of the spiral cells is visible on an internal mold of G. sinensis (Z. WANG,
1984, pl. I,3)].