Back
Hashenia
From Williams et al., 2017:
[Hashenia, Yu Jingxian and Zhang Wangping, 1980, p. 107.
Type Species: Hashenia reticulata, Yu Jing-xian and Zhang Wang-ping, 1980 (pl.2, fig.1)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Yu Jing-xian and Zhang Wang-ping, 1980]: (Translation: Chen et al., 1988, p. 16):
Description:
Cysts 4 to 6-sided in outline, endocyst enclosed by a periphragm which is 3 µm to 4 µm wide, paracingulum discernible, a weakly developed apical horn is present.
Archeopyle apical.
-----------------------------------
Chen et al., 1988, p. 16:
Remarks:
The description of this monotypic genus, together with the illustration of the holotype (Yu Jingxian and Zhang Wangping, 1980, pl. 2, fig. 1), lead us to believe that Hashenia and Canningia are congeneric. According to Yu Jingxian and Zhang Wangping, 1980, the range of Hashenia is Late Cretaceous (Turonian to Maastrichtian). Therefore, recognition of Hashenia as a junior synonym of Canningia extends the Last Appearance Datum of the latter genus from the base of the Campanian into the Maastrichtian.
[Hashenia, Yu Jingxian and Zhang Wangping, 1980, p. 107.
Type Species: Hashenia reticulata, Yu Jing-xian and Zhang Wang-ping, 1980 (pl.2, fig.1)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Yu Jing-xian and Zhang Wang-ping, 1980]: (Translation: Chen et al., 1988, p. 16):
Description:
Cysts 4 to 6-sided in outline, endocyst enclosed by a periphragm which is 3 µm to 4 µm wide, paracingulum discernible, a weakly developed apical horn is present.
Archeopyle apical.
-----------------------------------
Chen et al., 1988, p. 16:
Remarks:
The description of this monotypic genus, together with the illustration of the holotype (Yu Jingxian and Zhang Wangping, 1980, pl. 2, fig. 1), lead us to believe that Hashenia and Canningia are congeneric. According to Yu Jingxian and Zhang Wangping, 1980, the range of Hashenia is Late Cretaceous (Turonian to Maastrichtian). Therefore, recognition of Hashenia as a junior synonym of Canningia extends the Last Appearance Datum of the latter genus from the base of the Campanian into the Maastrichtian.