Taxonomy Online - Carboniferous spores part I - Species details


Species name
Spelaeotriletes giganteus Loboziak & Clayton, 1988

Description
Radial, trilete, camerate miospores. Amb convexly rounded triangular to almost circular. Trilete mark distinct; sutures straight, commonly accompanied by elevated folds which extend, decreasing in height, almost to the equatorial margin of the spore where they fuse with curvaturae perfectae which are invaginated in radial positions. Exine slightly thickened at the equatorial margin to form limbus. Exoexine scabrate to punctate; irregularly ornamented on the distal surface, at the equatorial margin and around the curvaturae with mixed rounded elements which are typically grana but may include sparse verrucae. Apiculate and biform elements are rare. Ornament reduced or absent in the contact areas. Intexine of inner body thin, laevigate; inner body rarely distinct, occupies one-third to one half of the spore diameter, attached to exoexine on proximal surface only.

Other descriptions
Loboziak and Clayton, 1988, p. 131, pl. 23, figs. 1–5

Size
Overall equatorial diameter 105(142)171 µm

Remarks
Spelaeotriletes giganteus is distinguished from all other representatives of the genus by its large size and fine irregular ornament.

Range
Mississippian; Visean to Serpukhovian; SG to RT biozones (Loboziak and Clayton, 1988).

Images

MPK 7254 MPK 7254 Figure 54a
North-east Libya; Mississippian, early Visean, SG Biozone, PO Sub-biozone (Loboziak and Clayton, 1988), Sample 9396, Specimen MPK 7254. Intexine indistinct, obscured by thicker exoexine. Exoexine surface scabrate and ornamented with grana, coni and widely spaced verrucae. Ornament projects at equatorial margin. Specimen maximum dimension 105 µm.


MPK 7255 MPK 7255 Figure 54b
North-east Libya; Mississippian, early Visean, SG Biozone, PO Sub-biozone (Loboziak and Clayton, 1988), Sample 9396, Specimen MPK 7255. Anomalous specimen showing very coarse verrucose elements some of which tend towards baculae in form. Well-developed curvatural ridges ornamented with lines of discrete verrucae. Specimen maximum dimension 133 µm.