A new species Synura morusimila sp. nov. was described from Great Xing’an Mountains, China. The colonies, scales and stomatocysts were observed using light, scanning and transmission electron microscopy. This Synura has two scale types on the same cell: spineless caudal scales and spine-bearing body scales. The caudal scales are ovate to obovate with small pores in the back of the scale. The body scales are characterized by cylindrical spine and the irregular reticulum on the base of the spine. The colony is large and oblong in shape with stomatocysts in it. The stomatocyst of Synura morusimila was named Stomatocyst 55, which is also new to science.
