Neoperla goguryeo Muranyi & Li 2015

Neoperla goguryeo Murányi & Li, 2015 Figs. 35−39 Material examined. Russia, Far East, Primorsky Krai: 3♂, 7♀, Kabarga River, Ussuri River basin, Amur River basin, 6.08.1999, coll. V. Teslenko; 2♂, 13♀, same place, at light trap, coll. T. Arefina; 1♂, 8♀, same place, 25.07.2003, coll. V. Lyubaretz; 1♂, 53♀, Kabarga River, Ussuri River basin, near bridge, 9.08.2004, coll. X. Semenchenko. Egg. Barrel-shaped (Fig. 35), chorion brown, total length 369−408 μm, equatorial width 204−216 μm (n=5). Anchor umbrella-shaped with a long pedicel (Fig. 36), the anchor surface appeared with polygonal units, globular bodies mainly single, distributed on the whole anchor plate, but denser located in the peripheral area along the anchor edge; at the top, a single globular body is in the center of each hexagonal unit (Figs. 36−37). Collar is sessile with an indistinct flange, wide, and surrounded by three irregular rows of coarse cells: the first row includes elongated trapezoid cells; the second row has pentagonal cells; and the third row is arranged with hexagonal-shaped cells punctured (Figs. 35–37). Сhorion is covered with long and short alternating triplets; ribs thicker and raised near the collar and lid; near the collar, the thickened ribs in each triplet are pointed and slightly tuberculate (Figs. 35−36). Lid is ringed by irregular rows of distinct deep hexagonal FCIs (ca. 40 FCIs visible laterally) with fine punctations on the floors; the walls are raised, thick, and smooth (Figs. 35, 38). Micropyles are situated subequatorial, closer to the anterior pole; each micropyle is located in the median row of a triplet; orifices have a small, semi-oval sperm guide (Figs. 35, 39). Chorionic structure on an external membrane bears scattered single globular bodies, distinctly smaller than globular bodies on the anchor surface (Figs. 35, 38). Comments. This complementary report of the egg is consistent with the original description of the egg of N. goguryeo (Murányi et al. 2015). The egg of N. goguryeo is very similar to that of N. ussurica; both species belong to the Neoperla (Formosita) lushana group, in which the chorion structure of eggs in all known species has triplets (Zwick & Sivec 1980, Zwick 2023). In the collar area, both species are distinguished by thickened ribs in each triplet: on N. goguryeo, the thickened ribs of the triplet are pointed and slightly tuberculate; on the N. ussurica triplets, the thickened ribs in the collar area are smooth. Neoperla ussurica differs also in the shape of the anterior pole, which is significantly narrower than that of N. goguryeo (Figs. 30, 35). The N. ussurica lid has fewer FCI rows than the N. goguryeo lid (Figs. 33, 38). In addition, the collar of N. ussurica is surrounded by two irregular rows of coarse polygonal cells, and the number of rows of such cells in N. goguryeo reaches three (Figs. 31, 37). Distribution. East Asian mainland species with limited distribution in North Korea (Murányi et al. 2015), South Korea (Hwang & Murányi 2020), and in Primorsky Krai of the Russian Far East, in Kabarga River, Ussuri River basin, Amur River basin. The species is recorded here in the Russian Far East for the first time.