Mallomonas cattiensis E.S. Gusev, H. Doan-Nhu & L. Nguyen-Ngoc, 2015

Gusev, Evgeniy S., Doan-Nhu, Hai & Nguyen-Ngoc, Lam, 2015, Mallomonas cattiensis, sp. nov. (Synurales, Chrysophyceae), a new species from Viet Nam, Phytotaxa 221 (2), pp. 188-192 : 189

publication ID

https://doi.org/ 10.11646/phytotaxa.221.1.9

DOI

https://doi.org/10.5281/zenodo.13633654

persistent identifier

https://treatment.plazi.org/id/03EC87A1-ED27-5042-F4B4-FAB1FED09FCB

treatment provided by

Felipe

scientific name

Mallomonas cattiensis E.S. Gusev, H. Doan-Nhu & L. Nguyen-Ngoc
status

sp. nov.

Mallomonas cattiensis E.S. Gusev, H. Doan-Nhu & L. Nguyen-Ngoc , sp. nov. ( Figs 2–22 View FIGURES 2–22 )

Cells dimensions unknown. Scales are tripartite, thick. Base plate with small pores. A patch of pores is in the angle of the V-rib ( Figs 6, 17–18 View FIGURES 2–22 ). Body scales with or without dome, oblong-oval 4.9–6.6 × 2.7–3.4 μm. Shield with 9–13 transverse ribs connected by struts, with a single row of pores between them and with 1–3 depressions ( Figs 7, 10, 13 View FIGURES 2–22 ). Dome with ribs ( Figs 2, 5, 8–10 View FIGURES 2–22 ). V-rib acute ( Figs 7–10 View FIGURES 2–22 ), continuous with the anterior submarginal rib ( Fig. 19 View FIGURES 2–22 ). Anterior flange with thick secondary layer in form of lobate structures (7–10). Proximal border wide, covering the posterior flange and often overlapping the V-rib. Caudal scales with stout spines ( Figs 14–17 View FIGURES 2–22 ), 3.5–3.6 × 2.0–2.3 μm. Apical scales are short and asymmetric, 4.1–4.5 × 2.0–2.5 μm ( Figs 11, 13 View FIGURES 2–22 ). Cysts unknown.

Type: — VIET NAM. Dong Nai Province: Ta Lai reservoir in Cat Tien National Park. 11° 23’ 16” N, 107° 21’ 03” E, E. S. Gusev, 10 th March 2014, SEM stub TL1/2014 (holotype IBIW!, see Fig. 10 View FIGURES 2–22 , sample TL1 10.03.2014, in collection E.S. Gusev. Isotype: SEM stub TL1, sample TL1 10.03.2014, in DMP collection at Oceanographic Museum, Institute of Oceanography, Viet Nam)

Distribution and habitat:— This species was found in the type locality and in a forest stream (11° 23’ 32” N, 107° 22’ 11” E) in Cat Tien National park.

Etymology:— Epithet “cattiensis ” refers to the fact that the species was first found in Cat Tien National Park ( Viet Nam).

Observations: Mallomonas cattiensis was found in a Ta Lai reservoir with pH=6.4, low conductivity values (37 μS cm-1) and high temperature (30 °C). Scales of this species were quite abundant in the samples from the reservoir, 4–6 per TEM grid.

IBIW

I. D. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences

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