Taxonomy Online - Carboniferous spores part I - Species details


Species name
Tripartites trilinguis (Horst) Smith & Butterworth, 1967

Description
Radial trilete miospores. Amb triangular, sides highly concave, apices rounded, giving trifoliate appearance. Trilete mark distinct, sutures simple, straight; extending half to two-thirds of spore radius. Exine extended laterally in the equatorial plane to form prominent rounded plicated or corrugated auriculae in the radial positions. Thickness of auriculae up to 6 µm, width 24–32 µm. Inter-radial areas deeply incised, narrow, occupied by markedly reduced inter-radial crassitude. Proximal exine laevigate but distal exine bears small well-spaced grana on the radial apices in an arc-shaped pattern between the ends of the trilete sutures and the inner margin of the auriculae. Exine of spore body thin.

Other descriptions
Horst, 1955, p. 176, pl. 23, figs. 55–56. Smith and Butterworth, 1967, pp. 208–209. p1. 13, figs. 6–9

Size
Overall equatorial diameter 32(44)51 µm

Remarks
Tripartites trilinguis differs from T. vetustus in possessing more laterally expanded auriculae producing a markedly trifoliate appearance, and in possessing an arcuate distribution of grana between the ends of the trilete sutures and the inner margin of the auriculae. T. trilinguis also lacks the characteristic plications of the auriculae which characterise T. vetustus.

Range
Mississippian; ?late Visean to early Serpukhovian [early Arnsbergian]; ?VF to TK biozones (Clayton et al., 1977, Owens et al., 1977)

Images

MPK 7559 MPK 7559 Figure 58a
Shales below Faraday House Sill, Argill Beck, Stainmore, Cumbria, England; Serpukhovian [Pendleian], NC Biozone, Sample LCS, Specimen MPK 7559. Note auriculae wrapped around radial apices and extending significant distance into inter-radial areas. Inter-radial areas concave with narrow crassitudes connecting the auriculae. Specimen maximum dimension 51 µm.


MPK 7566 MPK 7566 Figure 58b
Shales above Faraday House Sill, Argill Beck, Stainmore, Cumbria, England; Serpukhovian [Pendleian], NC Biozone, Sample MPA 31161, Specimen MPK 7566. Note auriculae wrapped around radial apices and extending significant distance into inter-radial areas. Trilete mark distinct, sutures simple, straight, extending to equatorial margin. Specimen maximum dimension 34 µm.