Leiodes rhaetica (Erichson, 1845)

Hoshina, Hideto, 2012, Review of the tribes Sogdini and Leiodini from Japan and North Chishima Islands. Part II. Genera Hydnobius and Leiodes (Coleoptera: Leiodidae), Acta Entomologica Musei Nationalis Pragae (suppl. 1) 52, pp. 1-168 : 141-143

33. Leiodes rhaetica (Erichson, 1845)

Japanese name: Tairiku-ô-tamakinokomushi ( Figs. 96–97 )

Anisotoma rhaetica Erichson, 1845: 57 .

Liodes rhaetica: REITTER (1885) : 105.

Leiodes rhaetica: HATCH (1929) : 19; DAFFNER (1983): 78 (redescription); BARANOWSKI (1993): 50 (redescription); PERREAU (2004): 198 (catalogue).

Leiodes rhaeticus: LAFER (1989a) : 322 (key to species of Leiodes in Russian Far East).

See HATCH (1929) and DAFFNER (1983) for ädditional synonymy and references.

Type locality. Austria, Tirol.

Specimens examined. NORTH CHISHIMA ISLANDS: 1 ♂, Araido Island, 21.vii.1931, K. Koba et al. leg. ( NSMT). The name of the second collector is not readable because of the damage of label.

Diagnosis of male (based on the above examined specimen). Head dark brown; pronotum and elytra a little dark brown; antennomeres 1–6 and 8 brown; remaining antennomeres a little dark brown.

Body 2.5–4.0 mm long, ca. 1.9× as long as wide ( Fig. 96A ). Head distinctly and densely punctate, bearing some large punctures ( Fig. 96A ); antennomeres 1–4 each longer than wide; antennomeres 5 and 11 each about as long as wide; remaining antennomeres each wider than long; antennomere 11 oval ( Fig. 96C ). Pronotum simply and very feebly curved at posterior margin, distinctly punctate, punctation similar to that on head ( Fig. 96A ). Elytra not transversely strigose; each elytron with nine rows of punctures, bearing small number of large punctures and moderate number of very fine punctures between rows ( Fig. 96D ); row 9 invisible in dorsal view, subhumeral row as long as ca. 1/3 of elytra in length ( Fig. 96B ); rows composed of puncture larger than those of pronotum ( Fig. 96A ); sutural stria fine, reaching from apex to ca. apical half of elytral length. Metathoracic wings fully developed. Mesoventrite without distinct excavation between median carina and transverse carina ( Fig. 96E ); median carina of mesoventrite low ( Fig. 96E ). Protibiae gradually widening from base towards apex ( Fig. 97C ); tarsomeres 2–4 of protarsi and mesotarsi expanded ( Fig. 97A ); metafemur bearing some tiny crenellations at posterior margin ( Fig. 97B ), with a large dorsal projection posteroapically ( Fig. 97D ); metatibiae distinctly curved inwards ( Fig. 97B ). Abdominal sternite 8 weakly curved ( Fig. 97E ); aedeagus as shown in Figs. 97 F–G.

Female. Not examined.

Differential diagnosis. The present species is similar to Leiodes furva (Erichson, 1845) inhabiting Europe and Russia in having extremely short parameres of the aedeagus, but may be distinguished by the median lobe of the aedeagus which is rounded apically in the dorsal view ( Fig. 97F ). In contrast, the median lobe is protuberant apically in L. furva .

Distribution. Europe, Russia, Mongolia ( DAFFNER 1983), North Chishima Islands (Araido Is.), and Alaska (BARANOVSKI 1993). New to North Chishima Islands.

Figures

Fig. 96. Leiodes rhaetica (Erichson, 1845). A – body, dorsal view; B – ditto, lateral view; C – antenna; D – elytral punctures; E – mesoventrite, lateral view. Scale I: 1 mm for A and B; II: 0.5 mm for C; III: 0.5 mm for E.

Fig. 97. Leiodes rhaetica (Erichson, 1845). A – male fore leg, ventral view; B – male hind leg, ventral view; C – male protibia, dorsal view; D – male metafemur, dorsal view; E – male abdominal sternite 8; F – aedeagus, dorsal view; G – ditto, lateral view. Scale I: 1 mm for A; II: 1 mm for B; III: 0.2 mm for C; IV: 0.2 mm for D; V: 0.2 mm for E; VI: 0.5 mm for F and G.