Stenodema sibirica Bergroth, 1914

Namyatova, Anna A., Dzhelali, Polina A. & Konstantinov, Fedor V., 2024, Delimitation of the widely distributed Palearctic Stenodema species (Hemiptera, Heteroptera, Miridae): insights from molecular and morphological data, ZooKeys 1209, pp. 245-294 : 245-294

publication ID	https://doi.org/ 10.3897/zookeys.1209.124766
publication LSID	lsid:zoobank.org:pub:069B4575-16D4-4EC4-804D-AB4618C9AB43
DOI	https://doi.org/10.5281/zenodo.13312358
persistent identifier	https://treatment.plazi.org/id/8C5152D7-023D-578A-80D9-CFF0729FA029
treatment provided by	ZooKeys by Pensoft
scientific name	Stenodema sibirica Bergroth, 1914
status

Treatment

Stenodema sibirica Bergroth, 1914 View in CoL

Figs 1 M View Figure 1 , 2 F View Figure 2 , 6 E – H, I, U View Figure 6 , 10 B, F View Figure 10 , 12 E – G View Figure 12 , 13 View Figure 13

Miris virens lateralis Sahlberg, 1873: 23 View in CoL (original description).

Stenodema lateralis View in CoL : Reuter 1891: 187 (comb. nov.).

Stenodema sibiricum Bergroth, 1914: 183 (new name for junior secondary homonym of Stenodema lateralis (Geoffroy, 1785 )); Carvalho 1959: 306 (catalogue).

Stenodema sibirica View in CoL ; Kerzhner 1988: 99 (key to species); Muminov 1989: 127 (key to species); Vinokurov and Kanyukova 1995: 98 (key to species); Kerzhner and Josifov 1999: 196 (catalogue); Yasunaga 2019: 301 (key to species). 5

Type material examined.

Lectotype of Miris virens lateralis Sahlberg, 1873 : Russia • ♀; Krasnoyarsk Terr., Yeniseysk [Jeniseisk]; 58.45 ° N, 92.18 ° E; no date provided; J. Sahlberg; ( http://id.luomus.fi/GZ.56515 ); ( MZH). GoogleMaps

Diagnosis.

Body length in male 5.8–6.5, in female 6.2–6.8; frons protruding above clypeus base (as in Fig. 1 H, I View Figure 1 ); setae on hemelytron simple; hemelytron brown to dark brown medially and yellow to pale brown along outer margin (Fig. 12 E – G View Figure 12 ); male vertex width / eye ratio 2.1–2.4; labium reaching mesocoxa but not surpassing it (as in Fig. 1 N View Figure 1 ); hind femur only slightly tapering towards apex, without spines; setae on posterior margin of hind femur as dense as on other parts of femur, shorter than half of hind femur (Fig. 2 F View Figure 2 ); hind tibia not curved basally (as in Fig. 2 J View Figure 2 ); swelling on propleura curved (Fig. 1 H View Figure 1 ); antennal segment I length / head width ratio in male 1.0, in female 0.9–1.0; antennal segment I / pronotum lengths ratio 0.8–0.9 in male, 0.8 in female; antennal segment I as wide as or slightly narrower than eye diameter; groove on posterior part of mesopleuron absent (Fig. 1 M View Figure 1 ); paired pits between calli absent (as in Fig. 1 G View Figure 1 ), setae on antennal segment I shorter than antennal segment I width; genital capsule ~ 1.5 × as long as wide, more or less acute apically, with outgrowth near left paramere socket (Fig. 6 T, U View Figure 6 ); right paramere ca 3 × as long as wide, its apical part slightly wider than basal part, its apical process bifurcate, ca 0.1 × as long as rest of paramere (Fig. 6 E, I View Figure 6 ); left paramere with apical process acute at posterior view (Fig. 6 K, P View Figure 6 ), its sensory lobe swollen (Fig. 6 J, M View Figure 6 ); vesica with one large and two small membranous lobes (Fig. 13 View Figure 13 ); dorsal labiate plate slightly longer than wide; sclerotized ring ~ 3 × as wide as long; distance between sclerotized rings ~ 0.3–0.5 × as long as sclerotized ring width (Fig. 10 B View Figure 10 ); posterior wall with sigmoid process between interramal lobes (Fig. 10 F View Figure 10 ).

Distribution.

Stenodema sibirica is known from Siberia, northern China, Mongolia, the Russian Far East, and Korea ( Kerzhner and Josifov 1999).

Notes.

Among the material preserved at ZISP, we found specimens with two types of vesica. They differ in the shape of the membranous lobes and the length of the ridge with sclerotized teeth (cf. Fig. 13 A – C View Figure 13 and Fig. 13 D – F View Figure 13 ). The genital capsule and parameres of specimens with these two types of vesica were very similar (cf. Fig. 6 E – H, U View Figure 6 and Fig. 6 I – L, T View Figure 6 ). We found only two males with the short, sclerotized ridge, and there were no females from the same series. There were no differences in the habitus between the specimens with two types of male genitalia. The lectotype preserved at the Finnish Museum of Natural History is a female, and we refrained from dissecting its genitalia, as it will not provide us with additional information on the issue. Therefore, we treat widespread form as S. sibirica and refrain from making any taxonomic decisions on the two specimens with another type of vesica, as the corresponding species may have been already described from China (see below for comparisons).

Stenodema sibirica is very similar to S. rubrinervis Horváth, 1905 . They have minor differences in the measurements i. e., vertex width / eye diameter ratio in male (2.1–2.4 in S. sibirica and 1.7–2.0 in S. rubrinervis ) and length of antennal segment I (1.8–2.1 in S. sibirica and 2.5–3.0 in S. rubrinervis ) (Table 1 View Table 1 ). The genitalia of those two species are very similar, and vesica of S. rubrinervis also has a long ridge of sclerotized teeth ( Yasunaga 2019: fig. 8 C).