Nigma is a genus of cribellate araneomorph spiders in the family Dictynidae, and was first described by Pekka T. Lehtinen in 1967. They have a wide distribution, including Eurasia, North America, and Northern Africa. N. walckenaeri is one of the biggest members of the Dictynidae, growing up to long. They are translucent green and sometimes have red or black markings on the abdomen.
it contains fourteen species:
Nigma conducens (O. Pickard-Cambridge, 1876) â€“ North Africa