Jomonlithus littoralis Inouye & Chihara, 1983

Ignatenko, Marina & Yatsenko-Stepanova, Tatyana, 2023, Coccolithophores in the algal flora from South Urals (Russia) with the description of a new Hymenomonas species, Phytotaxa 609 (1), pp. 55-64 : 58

Jomonlithus littoralis Inouye & Chihara ( Figs. 5–7 )

The diameter of the coccolith-bearing cell is 10.5–12.0 µm. The surface of the cell is covered by small oval-shaped coccoliths (muroliths), 1.07–1.39 × 0.77–0.92 µm; rim width 0.11–0.17 µm, rim height 0.2–0.29 µm. The coccolith structure corresponds to the description of Probert et al. (2014) to that which is composed of an organic base plate scale with a lightly calcified rim made up of small rectangular inner and outer sub-elements.

This species was observed from a backwater of the Ural River and Zhetykol Lake (see Table 2 ).

Figures

FIGURES 2–7. Coccolithophores from the reservoirs of the steppe zone of the South Urals (SEM). Figs. 2–4: Hymenomonas roseola. Figs. 5–7: Jomonlithus littoralis. The arrows mark the preserved areas of the organic basal plate. Scale bars: 2, 6–5 µm, 3, 4, 7–2 µm, 5–1 µm.