World Review and Keys to Genera of the Subfamily Inostemmatinae with Reassignment of the Taxa to the Platygastrinae and Sceliotrachelinae (Hymenoptera: Platygastridae)

Abstract The subfamily Inostemmatinae is considered a symplesiomorphic assemblage and the genera currently classified here are reassigned either to the subfamily Platygastrinae or the Sceliotrachelinae. Forty-one genera are treated, of which 15 are classified in the Platygastrinae, viz . Acerotella Masner, Aceroteta Kozlov and Masner, Allostemma gen.nov., Almargella gen.nov., Annettella gen.nov., Inostemma Haliday, Iphitrachelus Walker, Isostasius Foerster, Magellanium gen.nov., Metaclisis Foerster, Orseta gen.nov., Proplatygaster Kieffer, Rao gen.nov., Sacespalus Kieffer, and Zelostemma gen.nov. Twenty-six genera are classified in the subfamily Sceliotrachelinae, viz. Afrisolia gen.nov., Aleyroctonus gen.nov., Alfredella gen.nov., Allotropa Foerster, Amitus Haldeman, Aphanomerella Dodd, Aphanomerus Perkins, Austromerus gen.nov., Calomerella gen.nov., Errolium gen.nov., Fidiobia Ashmead, Helava gen.nov., Isolia Foerster, Nanomerus gen.nov., Neobia gen.nov., Oligomerella gen.nov., Parabaeus Kieffer, Platygastoides Dodd, Platystasius Nixon, Plutomerus gen.nov., Pseudaphanomerus Szelényi, Pulchrisolia Szabo, Sceliotrachelus Brues, Tetrabaeus Kieffer, Zelamerus gen.nov., and Zelandonota gen.nov. The following extant taxa are described: Afrisolia obesa gen.nov., sp.nov. ♀ (South Africa), Aleyroctonus pilatus gen.nov., sp.nov. ♀ ♂ (Java), Alfredella tasmanica gen.nov., sp.nov. ♀ ♂ (Australia), Allostemma fuscum gen.nov., sp.nov. ♀ ♂ (Chile), Almargella cristata gen.nov., sp.nov. ♀ ♂ (Chile), Annettella gracilis gen.nov., sp.nov. ♀ ♂ (New Zealand), Austromerus grandis gen.nov., sp.nov. ♀ ♂ (Australia), Calomerella scutellata gen.nov., sp.nov. ♀ (USA, Canada), Errolium piceum gen.nov., sp.nov. ♀ (New Zealand), Helava alticola gen.nov., sp.nov. ♀ ♂ (Colombia, Venezuela, Peru), Magellanium furviceps gen.nov., sp.nov. ♂ (Chile), Nanomerus spinulus gen.nov., sp.nov. ♀ (Chile), Neobia badia gen.nov., sp.nov. ♀ (Venezuela, Colombia, Ecuador, Trinidad [W.I.]), Oligomerella donnae gen.nov., sp.nov. ♀ (Australia), Orseta ornate gen.nov., sp.nov. ♀ ♂ (Canada), Plutomerus gen.nov. for Platygastoides indicus Mukerjee ♀ (India, Nepal), Rao pselaphus gen.nov., sp.nov. ♀ ♂ (Australia), Zelamerus amicorum gen.nov., sp.nov. ♀ ♂ (New Zealand), Zelandonota kiwi gen.nov., sp.nov. ♀ ♂ (New Zealand), and Zelostemma gen.nov. for Eurytoma oleariae Maskell ♀ ♂ (New Zealand). Fahringeria Kieffer is considered junior synonym of Fidiobia Ashmead; Nasdia Nixon and Platytropa Kozlov are considered junior synonyms of Allotropa Foerster. The above 41 genera are keyed, with separate keys to world genera and genera of America north of Mexico; with generic diagnoses, taxonomic remarks, distribution, biology, bibliography, and list of species described since Kieffer (1926). Higher classification and relationships of the above genera are discussed. Eighty-one plates with 258 figures (line drawings and micrographs) are included.