Description of Heterodera microulae sp. n. (Nematoda: Heteroderinae) from China – a new cyst nematode in the Goettingiana group

A new cyst-forming nematode, sp. n., was isolated from the roots and rhizosphere soil of in China. Morphologically, the new species is characterized by lemon-shaped body with an extruded neck and obtuse vulval cone. The vulval cone of the new species appeared to be ambifenestrate without bullae and a weak underbridge. The second-stage juveniles have a longer body length with four lateral lines, strong stylets with rounded and flat stylet knobs, tail with a comparatively longer hyaline area, and a sharp terminus. The phylogenetic analyses based on ITS-rDNA, D2-D3 of 28S rDNA, and sequences revealed that the new species formed a separate clade from other species in group, which further support the unique status of sp. n. Therefore, it is described herein as a new species of genus ; additionally, the present study provided the first record of group in Gansu Province, China.