Mennerius sp. B

Ovechkina, Maria N., Jordan, Richard W. & Mostovski, Mike B., 2017, On the validity, synonymy and distribution of some Lapideacassaceae (Haptophyta), Phytotaxa 308 (1), pp. 111-111 : 111

Mennerius sp. B cf. M. bispinosus (Perch-Nielsen in Perch-Nielsen & Franz, 1977) ( Figure 1D )

Scampanella bispinosa Perch-Nielsen in Perch-Nielsen & Franz, 1977: 853, pl. 6, figs 12–14.

Material examined:— Sample 3001/46, Korsun’ Fm., Subzone CC23 b, Lower Maastrichtian ; Bolshevik quarry [52.06°N 47.43°E], Vol’sk , Saratov Region, Russian Federation .

Description:—Proximal tier missing, distal tier consists of high thin elements, possibly with perforations. Apical cone conical; at least one short subaxial apical spine, which at most is as long as distal tier.

Note:—This specimen possibly represents a true M. bispinosus , which is positioned in such a way that its second apical spine is obscured.

Figures

FIGURE 1. Some Late Cretaceous representatives of the genus Mennerius. A. M. longus, Turonian, Ukraine; 48a, holotype. B. M. morosus, Turonian, Ukraine; 49a, holotype. C. Mennerius sp. A cf. M. bispinosus, Campanian, Ukraine. D. Mennerius sp. B cf. M. bispinosus, Lower Maastrichtian, Russia. E. M. cornutus, Lower Maastrichtian, Russia. F. Mennerius sp. A., Cenomanian, Israel. Scale bars 5 μm. (Figures 1A, 1B after Luljeva (1967); Figure 1C after Matveev (2015); Figures 1D–F, crossed nicols)