Platystethynium, Ogloblin, 1946

Triapitsyn, Serguei V., Dominguez, Chrysalyn, Ortis, Giacomo & Uliana, Marco, 2024, A remarkable new species of Platystethynium Ogloblin (Hymenoptera: Mymaridae) with apterous females from Italy, Journal of Natural History 58 (45 - 48), pp. 2207-2217 : 2209-2210

Key to species of Platystethynium

(subgenus Platystethynium ) in the Old World, females

1 Head in dorsal view at least as long as wide; body strongly flattened ( onomarchicidum species group); F3 without mps .................................................................................................... 2

– Head in dorsal view wider than long; body at most a little flattened ( Figure 4 (a)) ( triclavatum species group) (Europe); F3 with mps ...................................................................... ................................................. P. (Platystethynium) triclavatum ( Donev and Huber 2002)

2(1) F5 much larger than F6 ( Triapitsyn 2018, p. 161, fig. 105); macropterous ( Figure 4 (a)); ovipositor at least about 1.8 times length of metatibia and notably exserted beyond apex of gaster (Oriental region) ........................................................................................................... ........................................................... P. (Platystethynium) onomarchicidum Ogloblin 1946

F5 almost as large as F6 ( Figure 2 (b)); apterous ( Figures 2 (c) and 3(a–c)); ovipositor ( Figure 1 (b)) about 0.9 times length of metatibia and not exserted beyond apex of gaster (Europe) .............................................. P. (Platystethynium) apteron Triapitsyn , sp. n.

Figures

Figure 1. Platystethynium (Platystethynium) apteron, holotype female: (a) slide; (b) habitus in dorsal view.

Figure 2. Platystethynium (Platystethynium) apteron, female: (a) head in dorsoventral view (holotype); (b) antenna (holotype); (c) habitus in dorsolateral view (dry-mounted paratype).

Figure 4. (a) Platystethynium (Platystethynium) triclavatum, habitus of female in lateral view (molecular voucher specimen in ethanol from Monte Venda, Euganean Hills, Veneto, Italy); (b, c) opposite sides of the two Tettigoniidae eggs with exit holes of parasitoids found in the same soil sample together with the type series of P. (Platystethynium) apteron: a lighter and narrower egg of Eupholidoptera schmidti on the left and a darker and wider egg of Barbitistes vicetinus on the right.