...Fig. 3.— Microphotographs of the oncolitic limestone facies (Lo). A ) Gyrogonite with the apex not ending in a projection, diagnostic of the Porocharoideae subfamily. Scale  =  600 µm. B ) Gyrogonite with a necklike apex (arrow), diagnostic of the Stellatocharoideae subfamily. Scale  =  600 µm...

...Figure 4. Morphometric data of Lychnothmanus vectensis (30 gyrogonites) in the South Gobi area, Junggar Basin. ( 1–4 ) Frequency distributions: ( 1 ) gyrogonite height; ( 2 ) gyrogonite width; ( 3 ) isopolarity index; ( 4 ) number of convolutions. ( 5 ) Dispersion graph of gyrogonite height...

...Fig. 9.— Gastropods in French buhr. A) Planorbid near charophyte gyrogonite (upper left), CMNH 14695G from Duncan Grist Mill, scale bar 1 mm. B–D) High-spired gastropods. B) Latex of specimen from central of three chert millstones exhibited outside of Lanterman's Mill, Youngstown, scale bar...

.... They have antheridia and oogonia as reproductive organs, of which the oogonia secrete calcium carbonate forming gyrogonites, which are commonly fossilized. Maslov (1966) has claimed that only a thin outer layer of the oogonium called the utricle is calcified, but recent research shows that the entire...

...Fig. 4. Graphical analysis of selected gyrogonite populations. ...

...Wenxin Cao; Sha Li; Qiang Li; Thomas A. Stidham; Xiaoqiao Wan; Xijun Ni The published version of this article (Cao et al., 2022 ) contained an incorrect version of Figure 3 in which the images of fossil charophyte gyrogonites were arranged alphabetically rather than numerically and thus did...