Taxonomy Online - Carboniferous spores part I - Species details


Species name
Grandispora spinosa Hoffmeister, Staplin & Malloy, 1955

Description
Radial, trilete, camerate miospores. Amb circular, subcircular or rounded triangular, outline of inner body more or less conformable and occupying two-thirds to four fifths of the spore diameter. Trilete mark distinct or obscured by folding, sutures straight, extending at least three-quarters of the inner body radius, commonly accompanied by elevated flexuous folds of the exoexine that extend decreasing in height to the equatorial margin of spore. Intexine thin, laevigate, forms well-defined inner body with independent compression folds indicating major separation of the two exine layers. Exoexinal body wall 1–2.5 µm thick; exoexine infrapunctate, ornamented over entire distal surface and equatorial portion of proximal surface with sharply pointed coni and spinae, many of which may have bulbous bases. Elements with bulbous bases more commonly located in the polar regions with simple, sharply-pointed coni and spinae at the equator. Elements 2–8 µm high (commonly 2–5 µm) and 2–4 µm in basal diameter. Exoexine commonly folded due to compression.

Other descriptions
Hoffmeister, Staplin and Malloy, 1955, pp. 388–389, pl. 39, figs. 10 and 14. Sullivan and Marshall, 1966, p. 280, pl. 4, fig. 5

Size
Overall equatorial diameter 80(105)165 µm. Diameter of inner body 62(89)107 µm

Remarks
Distinguished from Grandispora echinata Hacquebard 1957, by its larger size and ornament of more widely spaced, bulbous-based spinae and coni.

Range
Mississippian; late Visean to Serpukhovian [Arnsbergian]; VF to SO biozones (Clayton et al., 1977; Turner et al., 1994)

Images

MPK 7130 MPK 7130 Figure 20a
Shales below Faraday House Sill, Argill Beck, Stainmore, Cumbria, England; Serpukhovian [Pendleian], NC Biozone, Sample LCS, Specimen MPK 7130. Extensively folded camerate miospore. Inner body subcircular with indication that simple trilete sutures extend to equator of body. Exoexinal body thin-walled, extensively folded with suggestion of limbate margin. Exoexine bears ornament of stout, bulbous-based coni, many of which project at equator. Specimen maximum dimension 163 µm.


MPK 7131 MPK 7131 Figure 20b
Shales below Holme Wood Marine Band, Mousegill Beck, Stainmore, Cumbria, England; Serpukhovian [Arnsbergian], TK Biozone, Sample M21, Specimen MPK 7131. Specimen with relatively large inner body. Inner body extensively folded independently of exoexine. Equatorial margin of exoexine limbate. Exoexine ornamented with scattered, stout conate elements on distal surface. Specimen maximum dimension 125 µm.