Taxonomy Online - Carboniferous spores part I - Species details


Species name
Schulzospora ocellata (Horst) Potonié & Kremp, 1956

Description
Radial, trilete, camerate miospores with a bilateral appearance due to the presence of an elliptical saccus-like exoexinal structure. Amb oval to subcircular, body oval to subcircular. Trilete mark distinct to indistinct; sutures simple, straight, extending between two-thirds and almost the full body radius. Exoexine infrapunctate with a narrow dark zone often occurring where the saccus overlies the equatorial margin of the spore body. Longest axis of the inner body usually oblique to the long axis of the miospore, rarely at right angles to it. Folding infrequent.

Other descriptions
Horst, 1955, p. 195, p1. 21, figs. 40a and b. Smith and Butterworth, 1967, pp. 275–276, pl. 23, fig. 6

Size
Overall equatorial diameter 61(90)130 µm. Diameter of inner body 56(66)77 µm

Remarks
Smith and Butterworth (1967) considered this to be the largest of the species of Schulzospora. The specimens illustrated here fall at the smaller end of the size range quoted by them. The characteristic used to distinguish the species is the obliquity of the inner body within the saccus-like exoexinal structure. Morphological intergradation, is however, known to occur with Schulzospora campyloptera (Waltz) Hoffmeister, Staplin & Malloy 1955. Schulzospora rara Kosanke 1950 has a rounder, less elongated overall outline than Schulzospora ocellata.

Range
Mississippian; late Visean to Serpukhovian [Arnsbergian]; NC to SO biozones (unpublished information, and Varker et al., 1990)

Images

MPK 7180 MPK 7180 Figure 49a
Shales below Hurlet Limestone, Upper Sedimentary Group, Hurlet Borehole, 160.70 m; Visean, VF Biozone, Sample MPA 9162, Specimen MPK 7180. Long axis of the body oblique to short axis of miospore overall. Trilete mark distinct; sutures simple, straight, extending approximately to half the body radius. Specimen maximum dimension 76 µm.


MPK 7181 MPK 7181 Figure 49b
Coal above Lower Stonesdale Limestone, Coldkeld Beck, Stainmore, Cumbria, England; Serpukhovian [Pendleian], NC Biozone, Sample CB21, Specimen MPK 7181. Note marked obliquity of inner body within saccus-like exoexinal structure, and dark margin of inner body. Specimen maximum dimension 61 µm.