Colon (Myloechus) shini Park and Hoshina

Park, Sun- Jae, Hoshina, Hideto & Ahn, Kee- Jeong, 2005, Descriptions Of Two New Species Of The Genus Colon Herbst (Coleoptera: Leiodidae: Coloninae) From Korea And Japan, The Coleopterists Bulletin 59 (4), pp. 407-413 : 411-413

Colon (Myloechus) shini Park and Hoshina new species

( Figs. 2 , 4 , 6, 8, 10, 12, 14, 16, 18)

Description. Length about 2.8–3.2 mm. Body almost concolorous, reddish brown to dark brown. Body about 2.3 times as long as wide ( Fig. 2 ), with dense, yellowish pubescence on dorsum. Head with seta bearing punctures sparser and finer than on pronotum, weakly microreticulate. Occiput without occipital carina, glabrous, strongly microreticulate. Antenna club ( Fig. 4 ) with 4-articles, antennomeres 1–5 longer than wide and other antennomeres wider than long, antennomere 2 as long as 3, antennomere 11 pentagonal and weakly pointed at apex. Clypeus almost straight on anterior margin. Labrum hexagonal, slightly emarginated at apex. Mentum (Fig. 8) emarginate at apex. Mandible with blunt incisor tooth, and with or without a small and blunt median tooth at apical one third, smooth molar lobe present. Galea (Fig. 6) with proximal sclerite bearing 3 long and blunt setae, lacinia with 1 large and blunt seta at apex. Pronotum with scattered large and small seta bearing punctures, weakly microreticulate. Elytra little wider than pronotum, with large and small seta bearing punctures and without longitudinal striae, sutural stria distinct and slightly curved, not microreticulate. Prosternum weakly pubescent, strongly microreticulate. Mesosternum with mesosternal carina, less pubescent, microreticulate. Metasternum densely pubescent, large seta bearing punctures absent laterally, weakly microreticulate. Tarsal formula 5- 5- 5 in both sexes. Protibia ( Fig. 10 ) with many blunt setae at apex, protarsus dilated in both sexes. Metafemur (Fig. 12) with a long and slender projection at apex in male, serrated along lower margin in male, metatibia straight in both sexes. Abdomen with 4 visible sternites in female and 5 visible sternites in male, intersegmental membranes between sternites long and with a brick-wall surface pattern. Aedeagus ( Figs. 14 and 16 ) stout. Parameres relatively short, triangular in dorsal aspect, thin in lateral aspect, some large setae present at base dorsally, abundant long setae present ventrally. Basal bulb moderately emarginated at dorsal apex, oval and nearly curved laterally. Spermatheca (Fig. 18) tubular and slender at base, expanded apically.

Type Series. Holotype, ♂, labeled as follows: ‘ KOREA: Gangwon Prov., Mt. Odaesan, Waljeongsa 22 VIII–20 X 2000, K.-J. Ahn and U.-S. Hwang, ex FIT; Holotype, Colon ( Myloechus ) shini Park and Hoshina, Desig. S.-J. Park and H. Hoshina 2004.’ deposited in CNUIC, Daejeon. Paratypes, 8; 1♂, labeled as follows: ‘ KOREA: Gangwon Prov., Pyeongchang-gun, Jinbu-myeon, Dongsan-ri , Mt. Odaesan , Sangwonsa , 22 VI 2001, S.-J. Park, ex sifting’ ; 3♂♂, 3♀♀, ‘ KOREA: Gangwon Prov., Pyeongchang-gun, Jinbu-myeon, Dongsan-ri , Mt. Odaesan , Sangwonsa , IX 15–XI 14 2001, K.-J. Ahn, C.-W. Shin ex FIT’ ; 1♂, JAPAN ‘ Odamiyama, Ehime Pref., Shikoku, 9–11 X 1993, I. Okamoto’ (Japanese specimen, deposited in Fukui University, Fukui).

Distribution. Korea and Japan.

Remarks. This new species is similar to C. (M.) appendiculatum Sahlberg, but is distinguished from it by having the striking projection of the male metafemur without setae (Fig. 12). Colon (M.) appendiculatum has a projection with some apical setae. Colon (M.) shini is also close to C. (M.) itoi Hisamatsu, but can be distinguished by its body length of 2.8–3.2 mm, male metafemur relatively weakly curved (Fig. 12), and aedeagus relatively short in dorsal aspect ( Fig. 14 ). In contrast, C. (M.) itoi has body length of 1.8–2.7 mm, male metafemur with a projection curved sharply and posteriorly, and aedeagus relatively slender in dorsal aspect.

Etymology. Named for Mr. C.-W. Shin who collected the specimens.

Figures

Figs. 1–2. Habitus photo. 1) Colon (Myloechus) koreanus, 2.7 mm; 2) C. (M.) shini, 3.2 mm.

Figs. 3–4. Antenna, dorsal aspect. 3) Colon (Myloechus) koreanus; 4) C. (M.) shini. 5–6. Maxilla, dorsal aspect. 5) C. (M.) koreanus; 6) C. (M.) shini. 7–8. Mentum, ventral aspect. 7) C. (M.) koreanus; 8) C. (M.) shini. Scale bars ¼ 0.1 mm.

Figs. 9–10. Protibia, ventral aspect. 9) Colon (Myloechus) koreanus; 10) C. (M.) shini. 11–12. Metafemur, ventral aspect. 11) C. (M.) koreanus; 12) C. (M.) shini. Scale bars ¼ 0.1 mm.

Figs. 13–16. Aedeagus. 13) Colon (Myloechus) koreanus, dorsal aspect; 14) C. (M.) shini, dorsal aspect; 15) C. (M.) koreanus, lateral aspect, arrows indicate dorsal regions; 16) C. (M.) shini, lateral aspect. Figs. 17–18. Spermatheca, lateral aspect. 17) Colon (Myloechus) koreanus; 18) C. (M.) shini. Scale bars ¼ 0.1 mm.