Taxonomy Online - Carboniferous spores part I - Species details


Species name
Murospora parthenopia Neves & loannides, 1974

Description
Radial, trilete, cingulate miospores. Amb rounded triangular with concave, rarely straight sides, and variably rounded apices. Spore body rounded triangular with concave sides and rounded apices. Trilete mark distinct, sutures simple, straight, sometimes open, extending to equatorial margin of spore body. Exoexine extended in the equatorial plane to produce equatorial cingulum of variable width, expanded in the apical regions to form thickened valvae, 3–15 µm high and 9–20 µm wide. Inner margin of thickening may transgress onto the spore body on the distal surface; outer margin smooth or indented owing to minor fluting. Inter-radially, cingulum is variable in form, sometimes the same width as valvae but not thickened; or alternatively narrow to almost absent. Distal surface of spore body may develop rudimentary thickened kyrtome-like structures. Exine laevigate.

Other descriptions
Neves and loannides, 1974, pp. 77–78, pl. 6, figs. 14–15

Size
Overall equatorial diameter 26(34)50 µm

Remarks
Neves and loannides (1974) considered this species to be synonymous with specimens recorded as Triquitrites coesfeldens by Bharadwaj and Venkatachala (1961).

Range
Mississippian; late Visean; NM Biozone (DP to ME sub-biozones) (Clayton et al., 1978)

Images

MPK 7166 MPK 7166 Figure 35a
Shales below Cove Lower Marine Band, Cove Harbour, Berwickshire, Scotland; Visean, NM Biozone, Sample MPA 18247, Specimen MPK 7166. Proximal focus showing well-defined inner body with slightly concave or convex sides and rounded apices. Trilete mark simple, sutures extending to body margin. Cingulum of variable width but expanded in apical region to form valvae-like structures. Specimen maximum dimension 42 µm.


MPK 7177 MPK 7177 Figure 35b
Shales below Cove Lower Marine Band, Cove Harbour, Berwickshire, Scotland; Visean, NM Biozone, Sample MPA 18247, Specimen MPK 7177. Abnormal variant with thick, uniformly wide cingulum but also showing tendency for extra thickening and incipient valvae development in radial positions. Specimen maximum dimension 47 µm.