Encyonema chebalingense sp. nov., a new freshwater diatom species (Cymbellales, Bacillariophyceae) from Guangdong Province, China

During a survey of freshwater diatoms from Mojiang River, Chebaling Nature Preserve in Shaoguan City, Shixing County, Guangdong Province, China, a new Encyonema species, Encyonema chebalingense sp. nov., was discovered. Based on observations with light and scanning electron microscopy, a detailed morphological description of E. chebalingense is here presented. The main features of E. chebalingense include: conspicuously asymmetrical and dorsiventral, semielliptical to semielliptical-lanceolate valves, with a filiform raphe; dorsal margin clearly arched and ventral margin nearly straight or slightly concave; central area on the ventral side formed by 1-2 shorter central striae; and short tectullae projecting within the striae. The new species was compared with some similar species, all of which show similarities to E. chebalingense but differ in features such as dimensions, internal valve structure, stria density and valve shape. This genus is common and abundant in relatively clean waters, and other new species most likely will be recorded in the future from China.

Automated summary

The new species of Encyonema, Encyonema chebalingense sp. nov., was discovered during a survey of freshwater diatoms from Mojiang River in Chebaling Nature Preserve, Shaoguan City, Shixing County, Guangdong Province, China. It is characterized by asymmetrical and dorsiventral valves with a filiform raphe, and a central area on the ventral side formed by 1-2 shorter central striae. Comparison with similar species revealed differences in dimensions, internal valve structure, stria density, and valve shape. This genus is common in clean waters, and more new species are likely to be found in China in the future.