Pelecinellidae is a small family of chalcidoid wasps, formerly treated as the subfamily Leptofoeninae within Pteromalidae.

They, like many small chalcidoids, are brilliantly metallic.

The subfamily contains three genera; Nefoenus, Doddifoenus (with four species[2]) and Leptofoenus (with five extant species).

[3] The species Doddifoenus wallacei is the largest known chalcidoid wasp, reaching nearly 5 cm (2.0 in) in length (including the ovipositor).

[4] The first pelecinellid species known from the fossil record, Leptofoenus pittfieldae, was described in 2009 by Michael S. Engel from a specimen found in Dominican amber.