Monomacrodon Cushman, 1934

Konishi, Kazuhiko, Chen, Hsuan-Pu & Pham, Nhi Thi, 2022, A taxonomic review of the genus Netelia, subgenus Monomacrodon (Hymenoptera: Ichneumonidae: Tryphoninae), with description of a new species, Raffles Bulletin of Zoology 70, pp. 376-384 : 378

Subgenus Monomacrodon Cushman, 1934

Monomacrodon Cushman, 1934: 2 (as genus). Type species: Monomacrodon bicolor Cushman, 1934 .

Diagnosis. This subgenus can be easily distinguished from any other subgenera of the genus Netelia by possession of a combination of following character states: Lateral carina of scutellum extending to apex of scutellum; hind tarsal claw with the pectination projecting beyond the claw apex; vein 3rs-m of fore wing entirely absent; cell 1A of fore wing without band of setae; hind wing with 3–4 distal hamuli; ovipositor twice as long as apical height of metasoma and the crease separating the epipleurum of third metasomal tergite extending the full length of the tergite. In male genitalia, the paramere is without pad and brace and shoulder of the basivolsella is weak.

Remarks. Among the characteristics enumerated above, the specialised hind tarsal claw is shared by Monomacrodon and Apatagium. Based on this, Gauld (1983) considered Monomacrodon + Apatagium as a monophyletic (holophyletic in Gauld (1983)) group. He listed eight characters as differences between them in the cladogram. Among them, Monomacrodon possesses seven apomorphic and one plesiomorphic character states while the only apomorphy of Apatagium is the absence of the occipital carina. However, in Monomacrodon , the occipital carina is present in N. (M.) bicolor and absent in N. (M.) elumbis . Thus, it is possible that Apatagium is paraphyletic with respect to Monomacrodon . On the other hand, Coronado-Rivera (2009) considered there to be no sister group relationship between Monomacrodon and Apatagium as a result of cladistic analysis based on morphological characters. Further research is needed to clarify taxonomic relationships of the subgenera within the genus Netelia , particularly based on molecular data.