Acmopolynema, Ogloblin, 1946

Huber, John T., Read, Jennifer D. & Triapitsyn, Serguei V., 2020, Illustrated key to genera and catalogue of Mymaridae (Hymenoptera) in America north of Mexico, Zootaxa 4773 (3), pp. 1-411 : 17

ACMOPOLYNEMA Ogloblin, 1946

( Figs 1–30 )

Acmopolynema Ogloblin, 1946: 286 . Type species: Stichothrix bifasciatipennis Girault, 1908 , by original designation.

Grangeriella Soyka, 1956b: 17 . Type species: Grangeriella indochinensis, 1956 , by original designation. Synonymy by Hayat & Anis, 1999b: 297.

Neonarayanella Husain & Farooqi, 1996: 83 . Type species: Maidliella orientalis Narayanan, Subba Rao & Kaur, 1960 , by original designation. Synonymy by Hayat & Anis, 1999b: 297.

Baburia Hedqvist, 2004: 235 . Type species: Baburia narendrani Hedqvist, 2004 , by original designation. Synonymy by Triapitsyn & Berezovskiy, 2007: 6.

Diagnosis. Body length 760–2500 μm. Face with torulus separated from transverse trabecula by about twice its own diameter ( Figs 2 , 13 ); propleura abutting medially anterior to prosternum ( Fig. 21 ); propodeum with V- shaped median carinae ( Figs 8 , 19, 23 ); fore wing usually with dark transverse bands ( Figs 1 , 7a ), sometimes without ( Fig. 7b ) and with some discal setae (especially on dark bands when present) modified, with enlarged bases; petiole distinctly longer than wide ( Figs 9 , 12 , 24–26 ), ventrally with longitudinal suture, and apparently attached to gs 1 ( Figs 11, 12 , 29 ).

Discussion. Acmopolynema belongs to the Polynema group of genera as defined and keyed by Triapitsyn & Berezovskiy (2007). Among the nine other Nearctic genera of the Polynema group ( Caraphractus , Cnecomymar , Eustochus , Kalopolynema , Mymar , Neomymar , Palaeoneura , Polynema , Stephanodes ), Acmopolynema is unique in having the propodeal carinae V- shaped. Acmopolynema species with clear wings, e.g., A. immaculatum Schauff , are most likely to be confused with Polynema species. The largest Nearctic species of Mymaridae , A. varium (Girault) at 2.5 mm in length, is classified in Acmopolynema .

Nearctic hosts. Cercopidae , Cicadellidae , Hemiptera : Orthoptera : Oecanthidae .

Important references. Schauff (1981) and Fidalgo (1989) treated the Nearctic and Neotropical faunas, respectively. Yoshimoto (1990) attempted to divide the Western Hemisphere species into species groups and keyed the groups. Although only slightly relevant to the Western Hemisphere fauna, Triapitsyn & Berezovskiy (2007) provided a useful key to Polynema -group genera and treated the Oriental and Australasian species.

Figures

FIGURE 1. Acmopolynema varium (Girault), habitus. USA, Virginia, Montgomery Co., 8 km N. Blacksburg, 1–17.viii.1987, CNC Hymenoptera Team. Scale bar=2000 μm.

FIGURES 2–5. Acmopolynema spp., head except 6. 2, A. sema Schauff, anterior; 3, A. sema Schauff, posterior; 4a, A. varium (Girault), lateral; 4b, A. varium, lateral (internal) showing ocular apodeme; 5, A. varium, dorsal; 6, antennae, lower image medial surface, upper image lateral surface. Scale bars=200 μm.

FIGURES 7, 8. Acmopolynema spp. 7a, A. varium (Girault), wings; 7b, A. immaculatum Schauff, wings; A. sema Schauff, mesosoma, dorsal. Scale bars: 7=500 μm; 8=200 μm.

FIGURES 9, 10. Acmopolynema spp. 9, A. varium (Girault), mesosoma + petiole, lateral; 10a, A. sema Schauff, gaster, dorsal; 10b, A. sema Schauff, ovipositor seen through gaster. Scale bars:=200 μm.

FIGURES 11, 12. Acmopolynema varium (Girault). 11a, metasoma, lateral; 11b, ovipositor; 12, male metasoma, lateral and genitalia, dorsal. Scale bars=200 μm.

FIGURES 13–18. Acmopolynema sp., head. 13, anterior; 14, posterior; 15, lateral; 16, dorsal; 17, ventral; 18, mouthparts. Scale bars=50 μm.

FIGURES 19–26. Acmopolynema sp., mesosoma or petiole. 19, dorsal; 20, lateral; 21, ventral; 22, anterior; 23, scutellum–propodeum, dorsal; 24, petiole, lateral; 25, petiole, dorsal; 26, petiole, ventral. Scale bars=100 μm.

FIGURES 27–30. Acmopolynema sp., metasoma. 27, dorsal; 28, ventral; 29, lateral; 30, apex of gaster, lateral. Scale bars: 27–29=100 μm; 30=20 μm.