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- Pteroloma pallidum Eschscholtz, 1829: 7.
- Lyrosoma ovipenne Lewis, 1893 (synonymy by Schawaller 1998)
- Lyrosoma suturale Lewis, 1893 (synonymy by Schawaller 1998)
- Lyrosoma chujoi Mroczkowski, 1959 (synonymy by Schawaller 1998)
- Lyrosoma ituropense Hlisnikovsky, 1964 (synonymy by Schawaller 1998)
KOREA: Gangwon Prov.: 1>1+, Goseong-gun, Hyeonnae-myeon, Daejin-harbor, 38°29'59.1"N, 128°25'46.2"E 9 m, 29 V 2012, IS Yoo, JH Song, seaweeds on seawall; 1> (dissected), Sokcho-si, Daepo-dong, Oeongchi-beach, 38°11'01.3"N, 128°36'31.9"E 21 m, 28 V 2012, IS Yoo, JH Song, under seaweeds; RUSSIA: 15>15+ (1>1+ on slide, 8>7+ in 80% EtOH), Kamchatka, Petropavlovsk-kamchatsky, Avacha Bay, 53°01'26.4"N, 158°38'31.3"E, 25 VII 2011, KJ Ahn, IS Yoo, under debris on seashore; 2>2+ (7+ in 80% EtOH), Kamchatka, Petropavlovsk-kamchatsky, Rescue Bay, 52°49'31.8"N, 158°35'51.1"E, 27 VII 2011, KJ Ahn, IS Yoo, seaweeds on rocky shore; 1+ (in 80% EtOH), Kamchatka, Petropavlovsk-kamchatsky, Rescue Bay, 52°49'31.8"N, 158°35'51.1"E, 27 VII 2011, KJ Ahn, IS Yoo, seaweeds on sandy beach; JAPAN: 44>54+ (1>1+ on slide, 24>30+ in 80% EtOH), Hokkaido, Oshima, Minami-kayabe, Ofuna, 42°00'01.9"N, 140°52'55.4"E, 7 VI 2012, KJ Ahn, IS Yoo, decaying seaweeds/starfish on seawall; 1>, Hokkaido, Akkeshi, Tokotan, 15 VI 1994, K. J. Ahn, on rock crevice in high tide; 3>18+, Hokkaido Prov., Nemuro City, Hamamatsu, 26 IX 2000, H.-J. Kim, M.-J. Jeon, under stones.
Body (Fig. 1) general carabid-shape, yellowish brown to reddish brown, surface glossy with microsculpture. Male. BL: 4.3–5.1 mm. Head as long as wide or slightly wider than long (HL/HW: 0.94–1.00); eyes medium and prominent, separated by about 5 times of eye width; eye about 0.8 times as long as temple; short setae present between facets, shorter than facet diameter; vertex of head without pale mounds; epistomal suture indistinct; epicranial suture more or less Y-shaped; dorsal surface with rather dense isodiametric microsculpture, ventral surface with transverse microsculpture. Antenna filiform, about 3 times as long as HW, antennomere 2 shortest, 3 and 11 longest, 4–7 similar in shape and length, 9–10 with dense sensilla in apical grooves, 9–11 very weakly clubbed. Labrum (Fig. 2) transverse; anterior margin deeply and broadly emarginate; anterior and each anterolateral margin distinctly membranous and transparent; 4–6 long setae and single very long seta present on membranous part of each side of midline; 3–4 spinose setae present on each anterolateral region of membranous part; anterior margin of membranous part with dense micro setae; sclerotized part with two setae on each side of midline and one seta on each anterior corner; surface of sclerotized part with many pores scattered sparsely. Mandibles (Fig. 3) symmetrical, inner regions without tooth; broad at base and pointed at apex; dorsal and ventral surface with many pores on medial area. Maxilla (Fig. 4) with 4 palpomeres; palpomeres 2–4 with distinct setae. Labium (Fig. 5) with 3 palpomeres; palpomeres 1–2 with long setae, last palpomere asetose; ligula caudal fin-like shape and bilobed, each lobe with 7–10 long setae on subapical region; ligula with many pores on medial and subapical regions of each lobe; paraglossa broadly developed, anterior margin with many setae densely distributed. Mentum trapezoidal narrowing apically; anterior margin straight; single long seta present on each anterolateral region; many pores scattered sparsely and microsculpture transverse. Submentum with many pores, short setae present sparsely. Pronotum broad cordiform, wider than long (PL/PW: 0.81–0.84); pronotum widest near anterior third; anterior corners round, posterior corners angled; pronotum without mid-basal fovea; disc with shallow and broad medial-longitudinal depression. Elytra oval and convex, gradually increased to posteriorly in convexity; longer than wide (EL/EW: 1.41–1.59); each elytron with 9 striae; intervals as wide as width of first antennomere, weakly convex and impunctate, dense isodiametric microsculpture present; basal lateral margin weakly serrate; epipleura without distinct punctures. Hind wings absent. Mesoventrite glabrous and sculptured strongly; mesoventral process sharp, contiguous to metaventral process. Metaventrite covering many setae sparsely, metaventral process sharp. Pro- and mesotarsi dilated, tarsomere 1?4 with numerous setae ventrally. Metatarsi simple and long; last tarsomere about 1.8 times as long as tarsomere 4. Tarsal claws simple, basal part with very feeble tooth; two empodial setae present, as long as tarsal claws. Abdominal sternites covering many setae, surface with dense isodiametric microsculpture. Aedeagus (Figs 7–10) without paramere; median lobe long and slender, middle part of apex slightly protruded (Fig. 9); structure of internal sac as in Figs 8 and 10. Female. BL: 4.6–5.2 mm. Basically not differ to male. Pro- and mesotarsi not dilated. Sternite VIII (Fig. 6) with posterior margin emarginate narrowly, a few setae present on marginal region; spiculum ventrale broad, deeply emarginate anteriorly.
Korea (new record), Russia (Kamchatka, Kuriles, Magadan, Sakhalin) and Japan (Hokkaido, Honshu), Figure 11.
- Yoo, I; Sikes, D; Ahn, K; 2013: A redescripton of Lyrosoma pallidum (Eschscholtz) and distributional range extension of Lyrosoma Mannerheim (Coleoptera, Agyrtidae) ZooKeys, 329: 23-32. doi
- Schawaller W (1998) Revision of the genus Lyrosoma Mannerheim, 1853 (Coleoptera, Agyrtidae). Entomologische Blatter 94: 127-133.