Dolichosoma (Dolichomorphus) femorale Morawitz, 1861

Miao, Jialin, Liu, Haoyu, Tong, Junbo & Yang, Yuxia, 2024, First record of the genus Dolichosoma Stephens (Coleoptera, Dasytidae) from China, with two newly-recorded species, Biodiversity Data Journal 12, pp. e 129639-e 129639 : e129639-

Dolichosoma (Dolichomorphus) femorale Morawitz, 1861

Dolichosoma femorale Morawitz, 1861 - Morawitz 1861: 317 (type locality: Russia); Kiesenwetter 1863: 644; Kiesenwetter 1867 b: 137, 139; Schilsky 1894 a: 235; Schilsky 1894 b: n. 45; Schilsky 1897: n. 34 X; Fiori 1908: 240; Porta 1929: 123; Pic 1937: 108; Kaszab 1955: 117; Kaszab 1977: 59; Majer 1986 a: 127; Majer 1986 b: 313; Lohse 1992: 22; Liberti 1995: 21; Majer 2005: 157.

Psilothrix (subg. Dolichomorphus) rufimanus Fiori, 1905 - Fiori 1905: 81; Pic 1937: 108.

Materials

Type status: Other material. Occurrence: recordedBy: Shuyong Wang; individualCount: 2; sex: 2 males; lifeStage: adult; occurrenceID: 273F628A-99C9-5F6A-AA49-FA3AD34115BB; Location: country: China; stateProvince: Xinjiang; county: Qinghe; locality: Ertai ; verbatimElevation: 940 m; Event: year: 1960; month: 7; day: 2; Record Level: institutionID: Institute of Zoology, Chinese Academy of Sciences; institutionCode: IZAS

Type status: Other material. Occurrence: recordedBy: Chunpei Hong; individualCount: 1; sex: 1 male; lifeStage: adult; occurrenceID: 7FC79093-0AD9-54A3-B7E2-1FEBBF9AC5A9; Location: country: China; stateProvince: Xinjiang; county: Manas; locality: Shihezi ; verbatimElevation: 415–550 m; Event: year: 1957; month: 6; day: 7; Record Level: institutionID: Institute of Zoology, Chinese Academy of Sciences; institutionCode: IZAS

Type status: Other material. Occurrence: recordedBy: Guang Wang; individualCount: 1; sex: 1 female; lifeStage: adult; occurrenceID: 702EE07E-F4D9-5539-AC0F-DD73E85FEE24; Location: country: China; stateProvince: Xinjiang; county: Manas; locality: Shihezi ; verbatimElevation: 460–510 m; Event: year: 1957; month: 6; day: 7; Record Level: institutionID: Institute of Zoology, Chinese Academy of Sciences; institutionCode: IZAS

Type status: Other material. Occurrence: recordedBy: Chunpei Hong; individualCount: 1; sex: 1 female; lifeStage: adult; occurrenceID: E76D42B8-3215-5563-B2F0-9B0305815DB9; Location: country: China; stateProvince: Xinjiang; county: Manas; verbatimElevation: 385 m; Event: year: 1957; month: 6; day: 9; Record Level: institutionID: Institute of Zoology, Chinese Academy of Sciences; institutionCode: IZAS

Type status: Other material. Occurrence: recordedBy: Shijun Ma, Kailing Xia, Yonglin Chen; individualCount: 1; sex: 1 female; lifeStage: adult; occurrenceID: 08FE7711-C5DF-58DA-BF1B-0EA590223610; Location: country: China; stateProvince: Xinjiang; county: Barkol; Event: year: 1955; month: 6; day: 28; Record Level: institutionID: Institute of Zoology, Chinese Academy of Sciences; institutionCode: IZAS

Description

Male (Fig. 1 A). Body slender, length 3.7–4.7 mm, width 0.8–1.0 mm.

Body green with strong metallic lustre. Antennae yellow, antennomeres 1 and 8–11 more or less darkened. Tibiae and tarsi yellow, tarsomeres more or less darkened. Body densely and coarsely punctate on surface, densely covered with rather short and recumbent whitish pubescence and scattered with a few erected black setae on head, pronotum and elytra.

Head width across eyes as wide as pronotum. Antennae serrate and quite short, extending to posterior margin of pronotum when inclined, antennomeres 2–10 triangular and nearly as long as wide, subequal in length, 11 fusiform and pointed at apices. Ultimate palpomere large and securiform, about 4.0 times longer and 1.5 times wider than the penultimate palpomere, with inner edge obviously angled near base.

Pronotum as long as wide, widest near middle, with anterior margin feebly arcuate, lateral margins moderately arcuate, posterior margin nearly straight, anterior and posterior angles widely rounded.

Elytra parallel-sided, round at apices, 3.2–3.3 times longer than wide at humeri, 3.8–4.0 times longer than pronotum.

Tarsal claws (Fig. 2 A – C) asymmetrical in the structure, each protarsal outer claw provided with a well-developed and large basal appendicle, while moderately large on inner claw; mesotarsal outer claw with a moderately large basal appendicle, while reduced on inner claw; metatarsal outer claw without basal appendicle, while weakly developed on inner claw.

Ultimate abdominal ventrite (Fig. 3 A) 1.4–1.6 times as wide as long, largely and trapezoidally emarginate in middle of posterior margin, membranous behind the middle emargination, rounded at apices of posterior-lateral angles, present with short central process at anterior margin, surface covered with long black setae along lateral margins. Pygidium (Fig. 3 B) 1.0–1.2 times longer than wide, feebly narrowed posteriorly, hardly emarginate in middle of posterior margin, shallowly and roundly emarginate in middle of anterior margin, with antero-lateral angles feebly protruding, surface covered with short black setae in centre and very long black setae along lateral margins. Aedeagus: tegmen (Fig. 3 C) nearly elliptic, strongly narrowed basally and pointed at base, parallel-sided, shortly bilobed and lateral lobes covered with a few long setae; median lobe (Fig. 3 D) strongly bent dorsally, with apical limb at an angle of 90 ˚ with basal limb, apical limb clearly longer than basal limb, strongly narrowed apically and pointed at apex; internal sac (Fig. 3 C – D) short, fitted with two lines of large black spines. Spiculum gastrale (Fig. 3 F) Y-shaped.

Female (Fig. 1 B). Similar to male, but body larger, 4.4–4.7 mm in length, width 1.0– 1.1 mm; head width across eyes narrower than pronotum, eyes smaller, antennae slightly shorter, ultimate maxillary palpomere with inner edge widely rounded. Pronotum feebly wider than long. Ultimate abdominal ventrite (Fig. 4 A) longer, strongly narrowed posteriorly, present with longer central process at anterior margin. Pygidium (Fig. 4 B) strongly narrowed posteriorly, nearly straight at anterior margin, with antero-lateral angles obviously protruding. Ovipositor (Fig. 4 C) stout and membranous, gonostylus feebly long and nearly cylindrical, transverse coxital baculus long and arched, baculus oblique and nearly as long as transverse coxital baculus.

Diagnosis

This species is the sole member of the subgenus Dolichomorphus ; it can be distinguished from all other species of Dolichosoma by the pronotum nearly as long as wide or transverse; elytra densely covered with short and recumbent whitish pubescence and scattered with a few erected blackish setae on surface; and the ultimate maxillary palpomere extremely large (about 4.0 times longer and 1.5 times wider than the penultimate palpomere) and securiform; pro- and mesotarsal claws (Fig. 2 A – C) provided with moderately or well-developed basal appendicles.

Distribution

China (Xinjiang, Fig. 8 ), Italy, Croatia, Greece, Bulgaria, Ukraine, Russia (throughout the temperate zone of country from Saint Petersburg to Vladivostok), Kyrgyzstan, Uzbekistan, Kazakhstan, Mongolia, Hungary and other Palearctic countries.

Figures

Figure 1. Habitus of Dolichosoma (Dolichomorphus) femorale Morawitz, 1861, dorsal view: A male; B female. Scale bars: 1.0 mm.

Figure 2. Male tarsal claws of Dolichosoma species, frontal views: A, B, C D. (Dolichomorphus) femorale Morawitz, 1861; D, E, F D. (Dolichosoma) lineare (Rossi, 1794). A, D protarsal claws; B, E mesotarsal claws; C, F metatarsal claws. Scale bars: 0.1 mm.

Figure 3. Dolichosoma (Dolichomorphus) femorale Morawitz, 1861, male: A ultimate abdominal ventrite (apical sternite), ventral view; B pygidium (apical tergite), dorsal view; C tegmen, ventral view; D median lobe, ventral view, E median lobe, lateral view; F spiculum gastrale, ventral view. Scale bars: 0.2 mm.

Figure 4. Dolichosoma (Dolichomorphus) femorale Morawitz, 1861, female: A ultimate abdominal ventrite (apical sternite), ventral view; B pygidium (apical tergite), dorsal view; C ovipositor, ventral view. Scale bars: 0.2 mm.

Figure 8. Distribution map of Dolichosoma species in China.