Status of Batakomacrus Kolarov (Hymenoptera: Ichneumonidae: Orthocentrinae), with new generic combinations and description of a new species

Abstract

Batakomacrus Kolarov, 1986 is redefined and Orthocentrus flaviceps Gravenhorst, 1829 and O. caudatus Holmgren, 1858 transferred to Batakomacrus (both new combinations); B. crassicaudatus Kolarov, 1986 is proposed as a junior synonym of B. caudatus syn. nov., and B. noyesi n.sp. is described from English and Scottish specimens. Keys to the species of Batakomacrus and to the genera of the Orthocentrus genus-group are provided. The extendable metasoma and ovipositor of Batakomacrus are illustrated and the possible phylogenetic significance of some character states are discussed. A preliminary phylogenetic analysis of representative Orthocentrus group species provides some evidence for the monophyly of all genera in the Orthocentrus group except for Stenomacrus, which is evidently paraphyletic as currently defined. Orthocentrus daucus Gauld, 1984 and O. excalibur Gauld, 1984 are transferred to Stenomacrus (both new combinations). Batakomacrus probably represents a rather basal clade within the Orthocentrus group but the character evidence for this is weak.