Taxonomy Online - Carboniferous spores part I - Species details


Species name
Kraeuselisporites ornatus (Neves) Owens, Mishell & Marshall, 1976

Description
Radial, trilete, cingulizonate, camerate miospores. Amb rounded triangular to subcircular, in lateral profile proximal surface flattened, low or pyramidal; distal surface hemispherical. Trilete mark distinct, sutures straight, extending to, or almost to, the equatorial margin of spore body, accompanied by elevated flexuous folds of the exoexine which extend decreasing in height to the margin. Exine composed of two layers. Intexine, thin, forms rounded triangular to subcircular inner body. Exoexine normally closely adpressed to the intexine but displays limited separation in the equatorial region. Exoexine extends to form bizonate cingulum. Maximum thickness of the exoexine developed over the distal surface and in the region of the cingulum adjacent to inner body margin. Outer zone of cingulum thinner and wider; sometimes appears weakly striated. Distal surface of exoexine ornamented with sharply pointed coni and spinae. Elements 2–10 µm high (commonly 3–5 µm) with the longest most slender elements located close to the junction of the body and cingulum.

Other descriptions
Neves, 1961, p. 269, pl. 33, fig. 3. Owens, Mishell and Marshall, 1976, pp. 153–154, pl. 2, figs. 2–4

Size
Overall equatorial diameter 76–110 µm

Remarks
Kraeuselisporites ornatus is distinguished from K. echinatus Owens, Mishell & Marshall 1976, by its smaller overall size and its proportionately smaller ornament of shorter, more slender coni and spinae.

Range
Mississippian to Pennsylvanian; Serpukhovian to Bashkirian [Arnsbergian to Langsettian]; SO to RA biozones (Clayton et al., 1977)

Images

MPK 7690 MPK 7690 Figure 30a
Shales below Gastrioceras cumbriense Marine Band, Waters Farm Borehole (14.50 m), England; Bashkirian [Yeadonian]], (G1) FR Biozone, Sample MPA 18197, Specimen MPK 7690. Median focus showing well-defined inner body surrounded by wide, striated zona. Distal surface bears ornament of sharply pointed spinae; elements appear to be rare on the zona. Minor evidence of separation between intexine and exoexine in the equatorial plane. Specimen maximum dimension 78 µm.


MPK 7693 MPK 7693 Figure 30b
Shales above Mousegill Marine Band, Argill Beck, Stainmore, Cumbria, England; Bashkirian [Kinderscoutian], (R1), KV Biozone, Sample A25, Specimen MPK 7693. Distal focus showing spinose ornament concentrated in distal polar region. Largest elements near to distal pole, equatorial elements mainly coni. Specimen maximum dimension 92 µm.