Aloconota hydrosmectoides Lee and Ahn, 2017

Lee, Seung-Gyu & Ahn, Kee-Jeong, 2017, A taxonomic study of Korean Aloconota Thomson (Coleoptera: Staphylinidae: Aleocharinae) with descriptions of five new species, Journal of Natural History 51 (25 - 26), pp. 1531-1556 : 1538-1542

Aloconota hydrosmectoides Lee and Ahn sp. nov.

( Figure 1 (c), 3(a – f), 4(a – h))

Description

Length 2.5 mm. Body ( Figure 1 (c)) surface glossy and densely pubescent with fine microsculpture. Body reddish brown to dark brown; antennomere 11 bicolour, paler at apex; head and abdominal segments V – VIII slightly darker than other parts; legs yellowish brown. Head ..Quadrate, approximately 1.0 – 1.1 times as long as wide, widest across eyes, about as wide as pronotum; eyes large and distinctly prominent, about 1.5 – 1.6 times as long as temples; gular sutures moderately separated, diverged basally; infraorbital carina absent; cervical carina complete. Antennae ( Figure 5 (a)) long and slender; antennomeres 1 – 3 elongate, 1 longest, 2 slightly longer than 3, 4 – 10 more or less dilated apically, 11 about as long as 1, slightly shorter than preceding two combined. Mouthparts. Labrum ( Figure 4 (a)) distinctly transverse, emarginate in anterior margin, with Ε- sensillum and eight macrosetae on each side of midline; epipharynx ( Figure 4 (b)) with several sensilla, including two lateral sensory rows on each side of midline; β- and γ- sensilla very short. Mandibles ( Figure 4 (c,d)) about 1.7 times as long as basal width; right one ( Figure 4 (c)) with internal tooth, internal margin slightly serrulate; prostheca composed of three portions. Galea and lacinia of maxilla ( Figure 4 (e)) very long and slender; lacinia composed of nine spines in distal comb region, isolated spines absent; maxillary palpomere 1 smallest, 2 about 3.0 – 3.2 times as long as wide, 3 slightly longer than 2, about 3.1 – 3.3 times as long as wide, 4 digitiform and relatively short, filamentous sensilla reaching to basal half. Prementum ( Figure 4 (f)) with two medial setae moderately widely separated; two basal pores moderately separated, about 3.0 – 4.0 times width of basal pore; several medial pseudopores, a few lateral pseudopores, one setal pore and about three or four real pores present on each side of midline; labial palpomere 1 largest, about 1.8 – 2.0 times as long as wide, γ- setula contiguous with b-seta, 2 shortest, about 1.4 – 1.6 times as long as wide, 3 parallel-sided and about as long as 1, about 3.0 – 3.5 times as long as wide. Mentum ( Figure 4 (f)) trapezoidal, anterior margin emarginate; v-seta short, closer to u-seta than w-seta. Thorax. Pronotum ( Figure 5 (b)) subquadrate, approximately 1.1 times as wide as long, widest in apical fourth, narrow apically, pubescence directed anteriorly in midline; hypomera fully visible in lateral aspect. Metanotal scutum with four to seven setae on each side of midline. Mesocoxal cavities narrowly separated; mesoventral process distinctly pointed at apex, shorter than isthmus and metaventral process combined; length ratio of mesoventral process, isthmus and metaventral process 13: 7: 9. Elytra slightly wider than pronotum; elytron approximately 1.6 times as long as wide, postero-lateral margin almost straight; pubescence directed posteriorly and postero-laterally; hind wings fully developed, flabellum composed of six or seven setose lobes. Legs. Slender and long, with pubescence and macrosetae; tibiae with different length of two spurs at apex; tarsal formula 4-5-5, length ratio of tarsomeres 24: 25: 27: 63 (protarsus); 34: 37: 37: 34: 61 (mesotarsus); 55: 46: 45: 42: 69 (metatarsus); one empodial seta present. Abdomen. Parallelsided; surface glossy and densely pubescent, with transversely imbricate microsculpture; macrochaetal arrangement of tergites II – VI 01-12-12-12-13; male tergite VII ( Figure 5 (c)) without tubercles; male tergite VIII with four macrosetae on each side of midline, posterior margin ( Figure 5 (d)) truncate; male sternite VIII with seven macrosetae on each side of midline, posterior margin subtriangularly convex, with long marginal setae; posterior margin of female tergite VIII similar to male ’ s; female sternite VIII with six macrosetae on each side of midline, posterior margin similar to male ’ s, with long and short marginal setae, minute setae present in median region. Aedeagus. Median lobe ( Figure 5 (e,f)) narrowly ovate, narrow and convergent apically in ventral aspect; apical process slightly bent in lateral aspect. Apical lobe of paramerites ( Figure 5 (g)) with four setae; a-seta longest, the other setae short and subequal in length, c- and d-setae positioned apically. Spermatheca. S-shaped; bursa large and dilated apically, with flat umbilicus; duct thick and recurved ( Figure 5 (h)).

Type material

Holotype, ♂, labelled as follows: ‘ KOREA: Gyeongbuk Prov., Ulreung-gun, Seo-myeon, Namyang-ri , Namyang-stream, N 37°28′33.36″ E 130°51′03.21″ 101 m, 18 IX 2014, IS Yoo, JS Lee ’ ( CNUIC). Paratypes, 27 exx. (total): 3 exx., same data as holotype ( CNUIC); 18 exx., same data as former except for ‘ N 37°27′58.04″ E 130°50′17.45″ ’ ( CNUIC); 6 exx., Daejeonsi, Dong-gu, Secheon-dong, Mt Sikjangsan , 36°19′29.27 ” N, 127°29′01.74 ” E, 103 m, 12 August 2014, IS Yoo, JS Lee, under fine sandy ground near stream ( CNUIC).

Remarks

This species is similar to A. brunnea sp. nov., but can be distinguished by the characters provided in the key and by the different shape and structure of the aedeagus and spermatheca. Most specimens have been collected near streams with other Aloconota species.

Etymology

Name derived from the Greek hydro (water) + smektes (one who washes) + oides (resemblance).

Figures

Figure 1. Habitus (a) Aloconota brunnea sp. nov., 2.3 mm; (b) Aloconota elongata, 4.0 mm; (c) Aloconota hydrosmectoides, 2.7 mm; (d) Aloconota impressa sp. nov., 3.0 mm; (e) Aloconota parviocularis sp. nov., 2.5 mm; (f) Aloconota sulcifrons, 4.5 mm; (g) Aloconota tuberculata sp. nov., 2.8 mm.

Figure 4. Mouthparts of Aloconota hydrosmectoides sp. nov. (a) Labrum (dorsal aspect); (b) epipharynx (ventral aspect); (c) right mandible (dorsal aspect); (d) left mandible (ventral aspect); (e) left maxilla (ventral aspect); (f) labium (ventral aspect).

Figure 5. Aloconota hydrosmectoides sp. nov. (a) Antenna; (b) pronotum; (c) male abdominal tergite VII (dorsal aspect); (d) male abdominal tergite VIII (dorsal aspect); (e) median lobe of aedeagus (lateral aspect); (f) median lobe of aedeagus (ventral aspect); (g) paramere (lateral aspect); (h) spermatheca. Scales = 0.1 mm.