Radial, trilete, camerate miospores with a bilaterally symmetrical appearance due to presence elliptical saccus-like exoexinal structure. Amb oval to ovoid. Inner body circular to oval with long axis parallel to the long axis of the miospore overall. Trilete mark not always visible; sutures simple, straight extend to, or almost to, inner body margin. Two of the sutures are commonly orientated parallel or nearly parallel to the long axis of the miospore with the third suture at right angles to them. Intexine of inner body relatively thin, laevigate or finely infrapunctate; long axis of inner body approximately three-quarters of miospore long axis, short axis of inner body almost equal in width to the short axis of the miospore. Exoexine thicker than intexine, laevigate to finely infrapunctate.
Kosanke, 1950, p. 53–54, pl. 13, figs. 5–8.
Smith and Butterworth, 1967, pp. 276–277, pl. 23, figs. 2–3
Overall equatorial diameter 52(77)105 µm.
Diameter of inner body 40(59)80 µm
is similar in size to S. campyloptera
(Waltz) Hoffmeister, Staplin & Malloy 1955, but may be distinguished by its more rounded, less elliptical shape and the proportionately larger size of the spore body.
Mississippian to Pennsylvanian; Visean to Bashkirian [Langsettian] (Smith and Butterworth, 1967)
MPK 7276 Figure 50a
Throckley Borehole, 72–75 ft., Northumberland, England; Bashkirian [early Langsettian], RA Biozone, Sample Th 72–75, Specimen MPK 7276. Subcircular inner body with short trilete sutures.
Specimen maximum dimension 77 µm.
MPK 7277 Figure 50b
Argill Shell Bed, Argill Beck, Stainmore, Cumbria, England; Bashkirian [uppermost Langsettian], RA Biozone, Sample ASB, Specimen MPK 7277.
Specimen maximum dimension 80 µm.