Taxonomy Online - Carboniferous spores part I - Species details


Species name
Schopfites claviger Sullivan, 1968

Description
Radial, trilete, acamerate or camerate miospores. Amb subcircular or circular. Trilete mark distinct or indistinct, sutures simple, straight, extending almost to the equatorial margin. Intexine thin (1–1.5 µm), indistinctly separated from the exoexine to form indistinct inner body occupying approximately three-quarters of spore diameter. Distal surface and equatorial region of exoexine ornamented with pila, rounded bacula and rare verrucae and coni. Elements 1–5 µm high and 1–3 µm in width (Higgs et al., 1988, quoted mean height and width as 3 µm and 1 µm respectively). Elements are normally discrete, although the density and distribution of the ornament is variable, giving rise to a patchy appearance on individual specimens. Proximal surface of exoexine laevigate. Exine thickness 1–2 µm.

Other descriptions
Sullivan, 1968, p. 121, pl. 25, figs. 9–10. Higgs, Clayton and Keegan, 1988, pp. 59–60, pl. 5, figs. 6–8 and 13

Size
Overall equatorial diameter 40(55)68 µm

Remarks
Although complete morphological intergradation is thought to exist between Schopfites claviger and S. delicatus Higgs 1975, the latter species is distinguished by possessing an ornament of finer sculptural elements that does not include rare coni and verrucae.

Range
Mississippian; late Tournaisian to early Visean; CM–Pu biozones (Higgs et al., 1988).

Images

MPK 7782 MPK 7782 Figure 47a
Mattson Formation, south face of Twisted Mountain, north-west of South Nahanni, Northwest Territories, Canada; Visean, MA Biozone (Playford, 1962), Sample MATT, Specimen MPK 7782. Distal/median focus showing distribution of pila over distal surface. Specimen maximum dimension 41 µm.


MPK 7783 MPK 7783 Figure 47b
Cementstone Group, Bracken Bay, Heads of Ayr, Ayrshire, Scotland; late Tournaisian, CM Biozone, Sample MPA 29832, Specimen MPK 7783. Specimen showing coarse pila and rare coni. Specimen maximum dimension 51 µm.