Taxonomy Online - Carboniferous spores part I - Species details


Species name
Cheiledonites major Doubinger, 1957

Description
Pollen grains with oval or fusiform outline. Specimens characterised by well-developed furrow which extends almost the complete length of the grain. Furrow sometimes contorted by folding, or accompanied on either side by thickened lip-like folds. Remainder of exine also folded with axes of irregular folds parallel to long axis of grain. Exine surface finely infrapunctate.

Other descriptions
Doubinger, 1957, pp. 125–133, fig. 3

Size
Length of grain 35–42 μm Width of grain 18–20 μm.

Remarks
Few formal descriptions of this species exist. The specimens described by Doubinger (1957) were recovered from Stephanian B sediments from Decazeville, France. The material documented in the present study is from Stephanian C–D sediments in north-west France, and appears to be closely comparable to Doubinger’s material in all but one respect, size. The present specimens have a maximum length of 120 µm.
The longitudinal furrow bordered by narrow folds distinguishes this species from representatives of the genus Entylissa. Cheiledonites potoniei Doubinger 1957, also described from Stephanian B sediments from Decazeville, France is distinguished by its smaller size.

Range
Late Pennsylvanian to Permian; late Kazimovian [late Stephanian A (Barruelian)] to ?Early Permian; ST Biozone (Clayton et al., 1977)

Images

MPK 7705 MPK 7705 Figure 4a
Littry, north-west France; Gzhelian [Stephanian C–D], NBM Biozone, Sample NBM, Specimen MPK 7705. Elongate, ovoid miospore or pollen grain with distinct longitudinal folds. Inner body appears to be present. Specimen maximum dimension 86 μm.


MPK 7712 MPK 7712 Figure 4b
Littry, north-west France; Gzhelian [Stephanian C–D], NBM Biozone, Sample NBM, Specimen MPK 7712. Specimen maximum dimension 89 μm.