Caudal alae is absent in

Caudal alae is absent in Meloidogyne sp.
Meloidogyne incognita, also known as the southern root-nematode or cotton root-knot nematode is a plant-parasitic roundworm in the family Heteroderidae. It typically incites large, usually irregular galls on roots as a result of parasitism.
Caudal alae are cuticular extensions on either side of or surrounding, the male cloaca and it is not present in meloidogyne spcies.
Females of M. incognita are pear-shaped with no posterior protuberance. Their stylet ranges from 15 - 16 µm long, and knobs are rounded and offset. Perineal pattern is oval to rounded, typically with a high dorsal arch, striae usually wavy, and lateral field absent or weakly demarcated.