Taxonomy Online - Carboniferous spores part I - Species details


Species name
Kraeuselisporites echinatus Owens, Mishell & Marshall, 1976

Description
Radial, trilete, camerate, zonate miospores. Amb rounded triangular to subcircular. In lateral compression proximal surface low, pyramidal; distal surface hemispherical. Trilete mark distinct, sutures straight, extending to margin of inner body, accompanied and obscured by elevated, flexuous folds of the exoexine, up to 8 µm high in the polar region but decreasing in height to the equatorial margin. Intexine thin, forming rounded triangular to subcircular inner body. Exoexine extended in the equatorial plane to produce strongly bizonate zona up to 25 µm wide. Exoexine thicker over distal surface of inner body and extending into the inner part of the zona, outer part of zona thinner and weakly striated. Two exine layers normally closely adpressed but minor separation may occur in the equatorial plane and over the more equatorial portions of the distal surface. Exoexine surface finely infrapunctate, distal surface bears distinctive ornament of large pointed coni and spinae with expanded bases; height of elements 4–14 µm, basal diameter 2–7 µm. Elements variable in distribution with maximum concentration usually occurring on the inner thicker zone of the zona close to the margin of the spore body.

Other descriptions
Owens, Mishell and Marshall, 1976, pp. 148–153, pl. 1, figs. 1-6, pl. 2, fig. 1

Size
Overall equatorial diameter 74(104)147 µm. Maximum equatorial diameter of inner body 54(71)82 µm

Remarks
Kraeuselisporites ornatus (Neves) Owens, Mishell & Marshall 1976, differs by possessing an ornament of apparently smaller, delicate coni and spinae. Kraeuselisporites scorpius Balme & Hassell 1962, described from the Upper Devonian of the Canning Basin, Western Australia is distinguished by possessing a narrower flange and a more densely distributed ornament of shorter, stouter, broad-based coni, spinae and irregular baculae.

Range
Mississippian to Pennsylvanian; late Visean to Bashkirian [Marsdenian]; VF to KV biozones (Clayton et al., 1977, and unpublished information)

Images

MPK 7056 MPK 7056 Figure 28a
Shales below Peasah Wood Limestone, Mousegill Beck, Stainmore, England; Serpukhovian [Arnsbergian], SO Biozone, Sample M18, Specimen MPK 7056. Distal ornament consists of coarse discrete spinose elements on both body and zona, with tendency for highest concentration in polar region. Specimen maximum dimension 120 µm.


MPK 7057 MPK 7057 Figure 28b
Shales below Faraday House Sill, Argill Beck, Stainmore, Cumbria, England; Serpukhovian [Pendleian], NC Biozone, Sample NC, Specimen MPK 7057. Note ornament of long slender spinae with maximum concentration of elements developed adjacent to the boundary between inner body and zona. Only a limited number of small elements are developed on the zona. Specimen maximum dimension 113 µm.