Paurodontella parapitica n. sp. (Nematoda: Hexatylina, Sphaerularioidea) from Kermanshah Province, Western Iran

Abstract

Paurodontella parapitica n. sp., collected from the rhizosphere of an apple tree in Kermanshah province, western Iran, is described. The new species is characterized by a body length of 505 to 723 mm (females) and 480 to 600 mm (males), lip region continuous by depression; 7 to 8 mm broad, 3 to 4 mm high, stylet length 7 to 9 mm or 1 to 1.3 times the lip region diameter, short postuterine sac of 4 to 6 mm long, lateral fields with five to six incisures; outer incisures crenated and inner incisures weakly crenated, excretory pore situated 90 to 100 mmfrom anterior end; functional males common in the population, with spicules 24 to 26 mmlong. Tail of both sexes similar, almost straight and elongate-conoid. The new species resembles in morphology and morphometrics to four known species of the genus, namely P. apitica, P. minuta, P. myceliophaga, and P. sohailai. The results of phylogenetic analyses based on sequences of D2/D3 expansion region of 28S rRNA gene revealed this genus is polyphyletic in four different clades in Tylenchid.