Nigma

{{Short description|Genus of spiders}}

{{About|the spider|the DC Comics supervillain|Riddler|the Cypriot cargo ship|SS Nigma}}

{{Automatic taxobox

| taxon = Nigma

| image = Nigma_walckenaeri_1.jpg

| image_caption = N. walckenaeri

| image2 = Nigma flavescens 1a.jpg

| image2_caption = N. flavescens

| authority = Lehtinen, 1967

| type_species = N. flavescens

| type_species_authority = (Walckenaer, 1830)

| subdivision_ranks = Species

| subdivision = 14, see text

}}

Nigma is a genus of cribellate araneomorph spiders in the family Dictynidae, and was first described by Pekka T. Lehtinen in 1967.{{cite journal| last=Lehtinen| first=P. T.| year=1967| title=Classification of the cribellate spiders and some allied families, with notes on the evolution of the suborder Araneomorpha.| journal=Annales Zoologici Fennici| pages=199–468| volume=4}} 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 {{convert|5|mm}} long. They are translucent green and sometimes have red or black markings on the abdomen.{{cite web| title=Genus Nigma| publisher=BugGuide| accessdate=2019-06-01| url=https://bugguide.net/node/view/403548}}