Quadrastichus erythrinae Kim, 2004, (quadra=four, stichus=line, erythrinae=of erythrina) is a small parasitoid wasp belonging to the family Eulophidae, but also a secondary phytophage by way of inducing galls on the leaves, stems, petioles and young shoots of various Erythrina species. Q. erythrinae was identified in 2004 in Erythrina galls collected in Singapore, Mauritius and Réunion. Eurytoma is a genus of wasps belonging to the family Eurytomidae of which some are parasitoids of Quadrastichus species; a parasitoid from the Eulophidae is Aprostocetus exertus.