Family of wasps
Signiphoridae (historically also known as Thysanidae) is a small family of parasitic wasps in the superfamily Chalcidoidea. The roughly 80 species are placed in four genera.
Diagnosis.
The Signiphoridae range in size from . They are usually black, brown, or yellowish, occasionally with salmon pink or white details, but never metallic. Cuticle sculpturing is very light when compared to families such as the Eurytomidae or Chalcididae.
The main diagnostic characteristics are: 
Habitat.
"Chartocerus" and "Thysanus" have cosmopolitan distributions. The only formal record for "Clytina" is from Eastern Europe. "Signiphora", which represents more than half of the known species, is primarily Neotropical.
Biology.
Most species have been reared in association with scale insects, mealybugs, aphids, psyllids and flies (chamaemyiids, gall-making chloropids, and drosophilid predators of scale insects. They can be either parasitoids or hyperparasitoids. While parasitoids contribute to control populations of other insects, hyperparasitoids can disrupt systems under biological control.
Systematics and classification.
Woolley (1988) made several changes in the classification at genus and species level after a phylogenetic analysis of the family. The available generic names in this group are "Signiphora" Ashmead, "Thysanus" Walker, "Chartocerus" Motschulsky, "Clytina" Erdös, "Neosigniphora" Rust, "Kerrichiella" Rozanov, "Rozanoviella" Subba Rao, "Xana" Kurdjumov, "Matritia" Mercet, "Signiphorina" Nikol'skaya and "Neocales" Risbec. The four last names are under synonymy or considered as subgenera in "Chartocerus". "Rozanoviella" and "Kerrichiella" are synonymized under "Signiphora". "Neosigniphora" is synonymized under "Thysanus". Hence, currently only four genera are valid. Subfamilies are not recognized.
Signiphoridae are believed to be most closely related to azotine aphelinids.
References.
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