|male Megadictyna thilenii from New Zealand|
|7 genera, 27 species|
They are small to medium-sized spiders found in small sheet webs close to the ground in eucalypt forests. In most cases the cephalothorax and legs are uniformly red and the abdomen black, for which these species are sometimes called the red and black spider.
The family Nicodamidae was established by Eugène Simon in 1898, for his newly described species Nicodamus dimidiatus (now Dimidamus dimidiatus). Mark Harvey published a major review of the family in 1955. At the time of the review, only two genera were accepted, Nicodamus from Australia and New Guinea, and Megadictyna from New Zealand. Based on a morphological cladistic analysis, Harvey divided the family into two subfamilies, Nicodaminae and Megadictyninae, and erected seven new genera. In 1967, Lehtinen had proposed that Megadictynidae constituted a separate family, but this was not accepted by Harvey. On the basis of molecular phylogenetic analysis, Dimitrov et al. re-established Megadictynidae in 2017, reducing Nicodamidae to seven genera.
- Ambicodamus Harvey, 1995 – Australia
- Dimidamus Harvey, 1995 – Australia, New Guinea
- Durodamus Harvey, 1995 – Australia
- Litodamus Harvey, 1995 – Australia
- Nicodamus Simon, 1887 – Australia
- Novodamus Harvey, 1995 – Australia
- Oncodamus Harvey, 1995 – Australia
The species of this family are only present in Australia and New Guinea.
- "Family: Nicodamidae Simon, 1897 (family detail)", World Spider Catalog, Natural History Museum Bern, retrieved 2017-08-15
- Simon, E. (1897), "Description d'arachnides nouveaux", Annales de la Société Entomologique de Belgique (in Latin), 41: 8–17
- Harvey, M.S. (1995), "The systematics of the spider family Nicodamidae (Araneae: Amaurobioidea)", Invertebrate Taxonomy, 9 (2): 279–386
- "Family Nicodamidae Simon, 1897", World Spider Catalog, Natural History Museum Bern, retrieved 2017-08-15
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