Mallomonas minuscula sp. nov. is described from Vietnam based on silica-scale morphology studied by means of transmission and scanning electron microscopy. This species belongs to the Mallomonas mangofera complex and is characterized by small scales with large polygonal papillae on the shield, raised wide arms on the anterior submarginal rib with small papillae, and a small "window" in the angle of the posterior submarginal rib. Scales of Mallomonas minuscula were found in nine localities from six provinces of Central and Southern Vietnam. The distributions and habitat conditions of the new species are summarized.
Mallomonas gusakovii sp. nov. is described from Vietnam based on silica-scale morphology studied by means of transmission and scanning electron microscopy. This species belongs to section Quadratae and is characterized by large and broad scales of three types with an internal reticulation, V-shaped rib and a forward projecting wing. Different types of the V-shaped rib in taxa from section Quadratae are discussed. Scales of Mallomonas gusakovii were found only in two sites in Phu Quoc Island, Southern Vietnam.
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