Taxonomy Online - Carboniferous spores part I - Species details


Species name
Cingulizonates capistratus (Hoffmeister, Staplin & Malloy) Staplin & Jansonius, 1974

Description
Radial, trilete, cingulate miospores. Amb convexly rounded triangular with rounded or roundly pointed apices. Trilete mark distinct to obscure, sutures straight, simple or accompanied by low, narrow. thickened labra, extending to equatorial margin of inner body. Intexine thin, laevigate, forming rounded triangular inner body. Exoexine normally closely adpressed to intexine and extended in the equatorial plane to form differentially thickened cingulum. Minor separation may exist in the equatorial plane between the intexine and exoexine. Cingulum bizonate, consisting of narrow, thick, inner zone and wider, thin, outer zone. Thin outer zone divisible into two components: an inner section containing a large number of radially orientated elongate vacuoles separated by narrow walls, and an outer part that is weakly striated and may bear an ornament of small coni. Cingulum approximately half spore radius in width.

Other descriptions
Smith and Butterworth, 1967, pp. 261–262, pl. 21, figs. 5–6

Size
Overall equatorial diameter 41(51)60 μm

Remarks
Radiizonates aligerens (Knox) Staplin & Jansonius 1964 differs in having longer trilete rays and a wider cingulum which has more prominent radiating struts separating internal vacuoles.
Brindley and Spinner (1989) noted the onset of common Cingulizonates cf. capistratus sensu Smith and Butterworth 1967 at a level within the NC Biozone, which they considered to coincide with the Visean–Namurian boundary in sequences of the Midland Valley of Scotland, northern England and Northern Ireland. However, Owens et al. (2004) have shown that the onset of common C. cf. capistratus occurs within the late Visean [Brigantian].

Range
(Cingulizonates cf. capistratus sensu Smith & Butterworth 1967) Mississippian; late Visean to early Serpukhovian [early Arnsbergian]; Cc to TK biozones (Owens et al., 2004).

Images

MPK 6958 MPK 6958 Figure 6a
Lower Limestone Group, Tirfergus Glen, Machrihanish, Argyll, Scotland; Serpukhovian [Pendleian], NC Biozone, Sample MPA 33341, Specimen MPK 6958. Specimen maximum dimension 60 μm.


MPK 6960 MPK 6960 Figure 6b
Lower Limestone Group, Tirfergus Glen, Machrihanish, Argyll, Scotland; Serpukhovian [Pendleian], NC Biozone, Sample MPA 33341, Specimen MPK 6960. Note more extensive development of vacuoles, several of which extend almost to the equatorial margin. Cingulum distal surface has small coni. Trilete mark indistinct; sutures appear to extend to the body margin. Specimen maximum dimension 60 μm.