Parydra (Chaetoapnaea) hautalai, Stuke, 2025

Parydra (Chaetoapnaea) hautalai spec. nov.

( Figs. 8, 23 View FIGURES 22–25 , 56–61 View FIGURES 56–61 )

Holotype: 1 ♂ with these labels: (1) “Fi, Lapland, Vikajarvi / 1.2 km ene Vikajärvi / (66.625°N 26.219°E) / 21.7.2020 “; (2) „ Holotypus / Parydra hautalai / spec. nov. ♂ / Stuke det. 2024“. The specimen is pinned using a minuten and is in excellent condition. The holotype will be preserved in the collection of the Finnish Museum of Natural History, Helsinki ( MZH). GoogleMaps

Paratypes: 1♂, 11.vi.1951, Ob Rovaniemi, Pisa [66.5°N 25.7°E], det. as P. mitis by Kahanpää, leg. H. Lindberg, coll. MZH GoogleMaps ; 1♂, 15.viii.2022, small lake 15 km n Kuusamo [66.107°N 29.176°E] GoogleMaps ; 1♀, 30.vii.2020, Kymenlaakso, Kotka, Kymijoki [60.501°N 26.878°E] GoogleMaps ; 1♂, 22.vii.2020, Lapland, Alajoki 9.7 km sse Tormänen [68.522°N 27.527°E] GoogleMaps ; 1♂, 22.vii.2020, Lapland, Juutuanvuono 2.8 km e Inari [68.899°N 27.095°E] GoogleMaps ; 1♀, 21.vii.2020, Lapland, Kakslauttanen [68.335°N 27.332°E] GoogleMaps ; 1♀, 20.vii.2020, Lapland, Keijoki 13 km ne Tervola [66.148°N 25.022°E] GoogleMaps ; 1♂, 21.vii.2020, Lapland, Kortteenniska e Torvinen [67.198°N 26.663°E] GoogleMaps ; 3♂♂, 20.vii.2020, Lapland, Ounasjoki n Rovaniemi [66.515°N 25.710°E] GoogleMaps ; 3♂♂ 4♀♀, 21.vii.2020, Lapland, Vikajarvi 1.2 km ene Vikajärvi [66.625°N 26.219°E] GoogleMaps ; 3♂♂ 6♀♀, 21.vii.2020, Lapland, Vuojoki 2.5 km nne Vuojärvi [67.105°N 26.638°E] GoogleMaps ; 1♂, 19.vii.2020, Northern Ostrobothnia, 2.9 km nne Säikkälänperä [64.888°N 25.170°E] GoogleMaps ; 1♂, 27.vii.2020, Northern Ostrobothnia, Irninjoki 2 km nne Seppälä [65.515°N 28.863°E] GoogleMaps ; 1♂, 25.vii.2020, Northern Ostrobothnia, Kuusamo, Perälampi [65.972°N 29.181°E] GoogleMaps ; 1♀, 19.vii.2020, Northern Ostrobothnia, Lonkkapudas 1.7 km ne Pikkarala [64.922°N 25.793°E] GoogleMaps ; 1♂, 27.vii.2020, Northern Ostrobothnia, Mäntylampi 2.8 km n Jämsä [65.896°N 29.786°E]. All paratypes are preserved in the collection PJHS if not mentioned otherwise GoogleMaps .

Description Holotype (♂):

Length about 3.1 mm. Wing length = 2.2 mm. Head height = 0.4 mm.

Head black. Gena-eye-ratio (in lateral view genal height measured at the maximum eye height: eye height) = 0.15. Antenna black. Ocelli black-brown, forming an almost equilateral triangle. Frontal triangle and frontorbital plate subshining, frontal vita densely dusted. Frontal triangle broad, reaching to ptilinal suture. Face straight in lateral view, subshining with silver to golden microtrichia. Ocellar seta and two lateroclinate fronto-orbital setae about as large as inner and outer vertical setae; 1 prominent facial seta with 2 smaller setae below; 5 inconspicuous genal setae. Scutellum without any process. Scutum and scutellum subshining, without any pattern of dusting. Pleurae grey to brown dusted. Two rows of small acrostichal setae. Only prescutellar dorsocentral seta distinct, in front of this 6 setulae that become smaller anteriorly and that may represent additional dorsocentral setae. No prescutellar seta; 2 notopleural setae, anterior one smaller; 1 postalar seta; 1 large apical and 1 smaller sublateral scutellar setae; 1 small seta at posterior margin of anepisternum. Wing brown infuscate with conspicuous white spots anterior and posterior to crossveins dm-cu and crossvein r-m and slightly darker brown around veins and crossveins. Veins dark brown. Knob of haltere black to dark brown and stem of haltere brown. Legs with tarsi black. Legs grey dusted except for the posterior surface of hind leg which is mainly shining. Coxae with black to brown setulae only. Middle coxa with an outstanding black seta, middle tibia without any obvious setae or setulae. Hind femur with a row of inconspicuous brown setulae posteroventrally. Hind tibia in the apical half with long ventral setae. Hind margin of tergite 4 and entirety of tergite 5 with long setulae that are distinctly longer than maximum diameter of hind tibia. Tergite III–IV-ratio (length tergite 3 medially: length tergite 4 medially) = 0.8. Tergite IV–Vratio (length tergite 4 medially: length tergite 5 medially) = 0.5. Sternites 3–4 as Fig. 61 View FIGURES 56–61 , sternite 5 not recognised due to lacking sclerotization or being fused with the hypandrium. Sternites 3–4 equally sclerotised. Sternites with scattered, inconspicuous setulae only. Epandrium as Fig. 60 View FIGURES 56–61 : without obvious characters. Subepandrial plate not developed. Hypandrium as shown in Fig. 57 View FIGURES 56–61 . Postgonite as shown in Fig. 56 View FIGURES 56–61 : base almost triangular with a distinct long, narrow tip. Phallus as shown in Figs. 56 and 58 View FIGURES 56–61 : narrow and with distinct apical notch in dorsal view; with characteristic upcurved tip in lateral view. Phallus apodeme as shown in Figs. 56 and 58 View FIGURES 56–61 : fused with phallus, short, broad at its junction with phallus. Lateral arms of phallus apodeme triangular in dorsal view ( Fig. 56 View FIGURES 56–61 ).

Variation: Freshly emerged specimens have almost hyaline wings.

Females: Agreeing with the description of the holotype with the exception of the genus specific characters of the postabdomen. Tergite 6 can usually be seen in dried specimens and is about half as long as tergite 5.

Diagnosis: The main characters of P. hautalai are (i) the uniformly dusted scutum without medial or submedial dusting stripes or dusting spots at transverse suture, (ii) its small size with wing length 2.0– 2.4 mm, (iii) black legs, (iv) subshining face clearly contrasting with the strong dusting on the frontal vita and (v) typically strongly brown infuscated wing without separated spots apically at media m and radius r 2+3. In male specimens (vi) tergite 5 is clearly longer than tergite 4 and both have obvious long setulae. The male terminalia are unique with (vii) the phallus narrow in dorsal view and obviously upcurved in lateral view and (viii) the postgonite with a triangular base and an elongated narrow tip.

Derivatio nominis: The species is dedicated to the Finish photographer Hannu Hautala (1941–2023) who lived in Kuusamo. His magnificent Book “Kuukkelin maa” came to my attention when I was sixteen and motivated me to visit Finland to experience the great nature around Kuusamo.

Distribution: So far P. hautalai is only recorded from Finland ( Fig. 111 View FIGURES 109–112 ) where it is widely distributed. Due to the confusion with other Parydra species it may turn out to be more widely distributed and occur outside of Finland.

Biology: Specimens were swept from fens, shores of lakes and sparsely to densely vegetated riverbanks. Existing records are from June to August. However, this only reflects the collecting activity of the author.