Taxonomy Online - Carboniferous spores part I - Species details


Species name
Torispora securis (Balme) Alpern, Doubinger & Horst, 1973

Description
Monolete miospores. Amb ovoid, subtriangular or irregular. Miospore consists of ovoid to subcircular spore body with a pronounced patinate crassitude either over the distal surface or the distal and lateral surfaces. Monolete mark usually distinct, suture straight or curved; simple; length approximately three-quarters or more of the spore body radius. Suture commonly parallel to the long axis of the spore. Intexine of spore body relatively thin, laevigate. Exoexine thickened over part of the distal surface or at least in part in the equatorial plane to form patinate crassitude which may in some cases overlap a significant part of the spore body on the proximal surface. Profile of crassitude in compressed specimens crescentic or sub-rectangular, surface smooth or finely roughened. Boundary between crassitude and spore body gradational or abrupt.

Other descriptions
Balme, 1952, p. 183. Smith and Butterworth, 1967, pp. 293–294, pl. 24, figs. 31–34

Size
Overall equatorial diameter 26(34)44 µm. Diameter of inner body 15(21)28 µm

Remarks
Smith and Butterworth (1967) did not differentiate Torispora securis, T. granulata Alpern 1959, T. laevigata Bharadwaj 1957 and T. verrucosa Alpern 1958.

Range
Pennsylvanian; Moscovian to Gzhelian [Bolsovian to ?early Autunian]; SL to ?VC biozones (Clayton et al., 1977)

Images

MPK 7092 MPK 7092 Figure 57a
Radwood Borehole, 3008 ft., West Midlands, England; Moscovian [Bolsovian], SL Biozone, Sample C, Specimen MPK 7092. Distal focus showing body protruding from patinate structure. Specimen maximum dimension 30 µm.


MPK 7093 MPK 7093 Figure 57b
Radwood Borehole, 3008 ft., West Midlands, England; Moscovian [Bolsovian], SL Biozone, Sample C, Specimen MPK 7093. Specimen maximum dimension 27 µm.