Mallomonas skvortsovii E.S. Gusev, H. Doan-Nhu, L. Nguyen-Ngoc & D. Kapustin, 2016

Gusev, Evgeniy S., Doan-Nhu, Hai, Nguyen-Ngoc, Lam & Kapustin, Dmitry A., 2016, Two new species of the genus Mallomonas from the Cat Tien National Park (Viet Nam): Mallomonas distinguenda and Mallomonas skvortsovii, Phytotaxa 273 (1), pp. 59-64 : 62

Mallomonas skvortsovii E.S. Gusev, H. Doan-Nhu, L. Nguyen-Ngoc & D. Kapustin sp. nov. ( Figs 17–20 )

Cells dimensions unknown. Scales are large, tripartite. Dome large, with parallel ribs (up to 10), more easily observed with TEM. Body scales suboval, 6.0–6.7 × 3.2–3.5 μm. Apical scale is slightly asymmetrical, 5.4 × 3.0 μm. Proximal border wide, with internal struts. Posterior flange narrow and smooth.Anterior flange with papillae. V-rib is prominent, wide, with internal struts. There is a one single pore at the base of the V-rib. Anterior submarginal rib is absent. Shield with densely and regularly arranged in distinct rows papillae. Papillae are placed in the angles of meshes of the internal reticulation, visible only on TEM images. Cysts and bristles unknown.

Type: — VIET NAM. Dong Nai Province: Dak Lua swamp in Cat Tien National Park . 11°30’43” N, 107°22’56” E, 10 th of March 2014, leg. E.S. Gusev, sample DL2/3, 10.03.2014, in collection E.S. Gusev. Holotype designated here: Fig. 17 (herbarium IBIW!). Distribution and habitat:— This species was only found at the type locality.

Etymology:— Named in honor of Boris V. Skvortsov (1896–1980) for his contribution to world phycological research.

Observations: Mallomonas skvortsovii was found in a Dak Lua swamp with pH=5.2, temperature 24°C and low conductivity values (10 μS cm-1). Scales of this species were very rare in the sample, 1 scale per 4 TEM grids.

Figures

FIGURES 17–21. Mallomonas skvortsovii sp. nov. Figs 17–18. Body scales, TEM. Fig. 19. Apical scale, TEM. Figs 20–21. Body scales, SEM. Scale bars: Figs. 17–18: 2 μm; Figs 19–21: 1 μm.