Taxonomy Online - Carboniferous spores part I - Species details


Species name
Raistrickia fulva Artüz, 1957

Description
Radial, trilete, acamerate miospores. Amb rounded triangular. Trilete mark distinct, sutures simple, straight, extending two-thirds to three-quarters of spore radius. Distal surface and equatorial portion of proximal surface of exine bears predominantly baculate ornament with infrequent coni and verrucae. Baculae rarely exceed 3 µm in height, basal diameter exceptionally up to 10 µm but commonly less, terminations truncate or apiculate. Density of ornament variable with 15–20 processes commonly protruding at the equator. Exine between processes laevigate; up to 5 µm thick.

Other descriptions
Artüz, 1957, p. 246, pl. 3, fig. 19. Smith and Butterworth, 1967, pp.180–181, pl. 8, figs. 17–20

Size
Overall equatorial diameter 39(52)69 µm

Remarks
Raistrickia irregularis Kosanke 1950 is larger. No other species assigned to the genus Raistrickia has such low, broad-based baculae.

Range
Pennsylvanian; Bashkirian [Kinderscoutian to Duckmantian]; KV to NJ biozones (Clayton et al., 1977)

Images

MPK 7380 MPK 7380 Figure 40a
BGS Offshore Borehole 74/13, 18.07 m, Firth of Forth, Scotland; Bashkirian [Duckmantian], NJ Biozone, Sample CSA 1231, Specimen MPK 7380. Rounded triangular miospore with densely distributed ornament of broad-based low bacula with tapering sides and rounded or multifurcate terminations. Remainder of exine laevigate. Specimen maximum dimension 57 µm.


MPK 7382 MPK 7382 Figure 40b
BGS Offshore Borehole 74/13, 18.07 m, Firth of Forth, Scotland; Bashkirian [Duckmantian], NJ Biozone, Sample CSA 1231, Specimen MPK 7382. Specimen with simple, straight, trilete sutures extending at least three-quarters of spore radius. Larger of the broad-based baculate ornament elements appear to be located at the equatorial margin; elements over remainder of distal surface appear smaller and organised in sub-concentric manner. Specimen maximum dimension 69 µm.