Hymenura Townes, 1965

Kikuchi, Namiki, 2021, The first record of Hymenura Townes, 1965 (Hymenoptera: Ichneumonidae) from Japan, Zootaxa 5040 (2), pp. 296-300 : 296

Genus Hymenura Townes, 1965

Hymenura Townes , in Townes et al. 1965: 603. Type species: Neopyga nigra Heinrich, 1930 . Original designation.

Diagnosis: This genus can be distinguished from the other genera of Ichneumoninae by the following combination of character states: clypeus flat, with apical margin slightly concave ( Figs 2A–C ); mandible evenly arched, with single tooth and a small impression indicating the position of the obsolescent lower tooth ( Figs 2A, D ); gena weakly bulging behind eye in dorsal view ( Fig. 2E ); scutellum highly elevated ( Fig. 2F ); propodeum with a full set of distinct carinae ( Fig. 2E ); propodeum without long apophysis ( Fig. 2F ); propodeal spiracle elongate ( Figs 2E, F ); gastrocoelus and thyridium distinct, wider than the inter-thyridial interval ( Fig. 3A ); apical margin of female T5 weakly and T6–7 strongly concave ( Fig. 3B ).

Remarks: By comparing Japanese specimens and previous descriptions (Jeong and Lee, 2008; Tereshkin, 2009), the Japanese specimens of Hymenura nigra ( Heinrich, 1930) show some small differences with previous descriptions, with these differences appearing to be continuous in nature, and simply intraspecific variation. An example of this is a white mark on hind tarsus; usually developed on 2 nd to 4 th tarsomeres, but some specimens completely lack the mark, e. g. KPM-NK 55272.

Figures

FIGURE 2. Hymenura nigra, female from Isa City, Kagoshima Pref. [KPM-NK 55274] (A, D–G), Yakushima Is. (B) and Chichibu City, Saitama Pref. (C). A–C, head in frontal view; D, right mandible in mesal view, an arrow pointing “a small impres- sion indicating the position of the obsolescent lower tooth”; E, head and mesosoma in dorsal view; F, mesosoma in profile; G, wings. Scales = 0.5 mm (A–C), 0.1 mm (D), 1.0 mm (E–G).

FIGURE 3. Hymenura nigra, female rom Kagoshima Pref. [KPM-NK 55274] (A, B) and Toyama Pref. [KPM-NK 55273] (C). A, postpetiole and T2 in dorsal view; B, apical part of metasoma in dorsal view; C, metasomal sternites in ventral view. Scales = 0.5 mm (A, B), 1.0 mm (C).