Four known species of Crassolabium Yeates,1967 from East Azarbaijan province, Iran

In order to identify free-living nematodes in East Azarbaijan province, several soil samples were collected from rhizosphere of the vegetations at different areas during 2016 and 2017. The nematodes were extracted using classic nematology techniques, and fixed and transferred to pure glycerin. Microscopic slides from the nematodes were prepared and the nematodes identified based on morphological and morphometric characteristics. Using the Identification key provided by Pena Santiago and Sibano (2008) and other related publications As a result, three species, Crassolabium saccatum,Crassolabium ettersbergense and Crassolabium himalum from Arasbaran forests and Crassolabium pumilum from Roodghat– Sufiyan were identified, which are new reports for Iran nematode fauna. The genus Crassolabium belongs to the family Qudsianematidae and characterized by 0.6- 2.1 mm body length, lip region more or less offset, odontostyle moderately long, female genital system amphidelphic, vulva transverse, rarely longitudinal, 3 to 18 ventromedian supplements, tail similar in both sexes, short, rounded or convex-conoid. Crassolabium saccatum differs from C. diversum by lip region morphology (more or less offset vs strongly offset) and lower V value (49-51 vs 54-59). Crassolabium ettersbergense similar to C. parvulum but is separated with lip region shape (strongly offset vs not offset). Differences between Crassolabium himalum and C. neohimalum are as shorter body length (1.07-1.35 vs 1.32-1.47 mm), longer tail (25-27 vs 22-26 μm) and symmrtrical lip region. Crassolabium pumilum is separated from C. medianum by absence pars refrengense vaginae and lacking saccate bodies on tail.

کلیدواژه ها:

Arasbaran forests ، Roodghat and Qudsianematidae