Taxonomy Online - Carboniferous spores part I - Species details


Species name
Raistrickia clavata Hacquebard 1957 emend. Playford, 1964

Description
Radial, trilete, acamerate miospores. Amb rounded to convexly triangular. Trilete mark distinct or obscured by ornamentation; sutures simple, straight, extending up to three-quarters of spore radius. Exine 2–3 µm thick and ornamented with conspicuous discrete, short, club-shaped, baculate processes. Elements 5–10 µm high, 2–4 µm in basal diameter with slightly tapering shafts before expanding into a bulbous or flattened termination 3–7 µm in width. Ornament predominantly developed on distal surface with minor elements on more equatorial portion of proximal surface.

Other descriptions
Hacquebard, 1957, p. 310, pl. 1, fig. 25. Playford, 1964, pp. 24–25, pl. 6, figs. 5–10. Higgs, Clayton and Keegan, 1988, p. 56, pl. 4, fig. 13

Size
Overall equatorial diameter 55(62)94 µm

Remarks
Raistrickia ponderosa Playford 1964 is distinguished from R. clavata by being larger and possessing a thicker, more uniformly sculptured exine and a more constantly circular outline. R. strumosa Playford 1976 possesses a similar style of ornamentation but may differ in possessing more densely distributed processes and by having a thicker exine.

Range
Mississippian; Tournaisian; PC to CM biozones (Higgs et al., 1988)

Images

MPK 7392 MPK 7392 Figure 37a
Horton Bluff Formation, Horton Bluff, Nova Scotia, Canada; Tournaisian, VV Biozone, AD Sub-biozone (Utting et al., 1989), Sample P6400, Specimen MPK 7392. Subcircular specimen split open along line of trilete suture. Distal surface and equatorial portion of proximal exine ornamented with distinctive baculate elements. Elements typically consist of broad base, tapering short shaft and expanded round-topped bulbous termination. Specimen maximum dimension 66 µm.


MPK 7393 MPK 7393 Figure 37b
Horton Bluff Formation, Horton Bluff, Nova Scotia, Canada; Tournaisian, VV Biozone, AD Sub-biozone (Utting et al., 1989), Sample P6400, Specimen MPK 7393. Trilete sutures obscured by ornamentation. Specimen maximum dimension 71 µm.