Taxonomy Online - Carboniferous spores part I - Species details


Species name
Spelaeotriletes balteatus (Playford) Higgs, 1975

Description
Radial, trilete, camerate miospores. Amb rounded triangular to subcircular. Trilete mark distinct to obscure; sutures, when seen, extend to margin of ill-defined inner body, straight and accompanied by narrow sinuous exoexinal folds which extend to or almost to equatorial margin. Ends of exoexinal folds fuse laterally with curvaturae which are more or less coincident with equatorial margin except in radial positions where minor invagination occurs. Intexine often barely perceptible; forms ill-defined inner body, which occupies approximately half miospore diameter with outline conformable with equatorial margin. Exoexine thicker than intexine. Proximal surface laevigate except at the radial margins. Distal surface densely and uniformly ornamented with small, wide-based spinae up to 3 µm in height together with infrequent coni and grana. Elements may be discrete or may be basally fused to form low rugulae or cristae. Equatorial margin of exoexine thickened due to presence of curvatural ridges.

Other descriptions
Playford, 1962, p. 657, pl. 95, figs. 4–6. Sullivan, 1964, p. 376 Higgs, 1975, p. 400, pl. 6, fig. 10. Higgs, Clayton and Keegan, 1988, p. 73, p1. 13, figs. 1–3

Size
Overall equatorial diameter 42–102 µm. Diameter of inner body 30–62 µm

Remarks
Spelaeotriletes obtusus Higgs 1975 is similar but is distinguished by having a non-apiculate ornament. Aratrisporites saharaensis Loboziak, Clayton & Owens 1986 is smaller and, although possessing similar exoexinal ornamentation, is readily distinguished by its monolete suture.

Range
Mississippian; Tournaisian; BP to CM biozones (Higgs et al., 1988). May extend into the Visean in the Rhadames Basin of Western Libya (Loboziak and Clayton, 1988).

Images

MPK 7117 MPK 7117 Figure 52a
Sample 9379, north-east Libya; Carboniferous, late Visean, SG Biozone, OA Sub biozone (Loboziak and Clayton, 1988), Specimen MPK 7117. Distal ornament mainly discrete coni, spini and baculae that project at equatorial margin. Specimen maximum dimension 67 µm.


MPK 7123 MPK 7123 Figure 52b
Sample 9379, north-east Libya; Carboniferous, late Visean, SG Biozone, OA Sub biozone (Loboziak and Clayton, 1988), Specimen MPK 7123. Specimen maximum dimension 69 µm.