Taxonomy Online - Carboniferous spores part I - Species details


Species name
Triquitrites sculptilis (Balme) Smith & Butterworth, 1967

Description
Radial, trilete, acamerate miospores. Amb irregularly triangular with more or less straight sides and rounded, flat or lobate apices. Shape dependent on the extent of exine ornamentation. Proximal surface flattened, distal surface inflated hemispherical. Trilete mark distinct to indistinct, sutures simple, straight; extending from two-thirds to the full spore radius. Proximal exine laevigate but distal exine ornamented with irregular pattern of ridges and verrucae. Verrucae variable in size and distribution; frequent fusion occurs between the bases of adjacent elements to produce an ill-defined reticulate pattern. Thickening of the exine at radial apices occurs to produce a variable crassitude. When associated with verrucae, this projects at the equatorial margin. Crassitudes, may in some cases, extend into inter-radial areas. Crassitudes vary from 2–7 µm across when measured along a given radius, and are 10–17 µm in width. Exine moderately thick.

Other descriptions
Balme, 1952, p. 181, text-fig. 1g. Smith and Butterworth, 1967, p. 204, pl. 12, figs. 10–15

Size
Overall equatorial diameter 25(37)45 µm

Remarks
Smith and Butterworth (1967) regarded Triquitrites bucculentus Guennel 1958, and T. coesfeldens Bharadwaj 1957, as forms which fall within the extremes of the range of morphological variation displayed by T. sculptilis.

Range
Pennsylvanian; Moscovian [late Duckmantian to early Asturian] (Smith and Butterworth, 1967)

Images

MPK 7222 MPK 7222 Figure 60a
Shafton Top coal seam, Gate Farm Borehole, Yorkshire Coalfield, England; Moscovian [Bolsovian], SL Biozone, Sample C4, Specimen MPK 7222. Specimen maximum dimension 40 µm.


MPK 7224 MPK 7224 Figure 60b
Shafton Top coal seam, Gate Farm Borehole, Yorkshire Coalfield, England; Moscovian [Bolsovian], SL Biozone, Sample C4, Specimen MPK 7224. Proximal focus demonstrating variable character of radial and inter-radial crassitude. Specimen maximum dimension 43 µm.