Baeoceroxidium micros (Achard, 1923) Achard, 1923

Ogawa, Ryo & Löbl, Ivan, 2013, A revision of the genus Baeocera in Japan, with a new genus of the tribe Scaphisomatini (Coleoptera, Staphylinidae, Scaphidiinae), Zootaxa 3652 (3), pp. 301-326 : 324

Baeoceroxidium micros (Achard, 1923) , comb. nov.

( Figs. 22, 23 , 33, 41–46, 57, 74, 75)

Scaphosoma micros Achard, 1923: 116 ; Miwa & Mitono, 1943: 544. Scaphisoma micros: Nakane, 1955: 56 .

Eubaeocera micros: Löbl, 1969: 335 .

Baeocera micros: Löbl, 1984b: 184 .

Redescription. Body oval, shining. Pronotum and elytra black to dark reddish-brown; basal and apical portion of elytra reddish-brown; frons, clypeus, labrum, antennomeres I and II, tibiae and femora reddish-brown; maxillary palpi, tarsus and antennomeres III–VI yellowish-brown; antennomeres VII–XI dark yellowish-brown; head black. Head, pronotum and elytra sparsely and finely pubescent.

Head with interocular distance about twice as long as eye width. Punctuation sparse and fine. Antennomeres I– VI with a few macrosetae, VII–XI covered with some macrosetae; segments VII, IX and XI each about twice as long as III (Fig. 34).

Pronotum wider than long, widest at base, lateral keel distinct except near basal angles. Punctuation sparse and fine, as on head. Scutellum slightly wider than long, exposed at apex.

Elytra almost as long as wide, widest at basal fourth, lateral margins gradually narrowed apically, minutely serrate at inner part of posterior margin; punctuation evenly sparse and coarse. Sutural striae extending outwards along basal margin to form complete basal stria joined to lateral stria.

Propygidium and pygidium sparsely and finely punctuate; pygidium gradually narrower toward apex, with 2 macrosetae.

Hypomeron impunctate. Mesoventrite sparsely and finely punctuate, as pronotum. Lateral portion of metaventrite sparsely and coarsely punctuate. Mesepimeron about 1.5 times to twice as long as wide. Mesocoxa almost as wide as interspace between mesocoxa or slightly narrower; mesocoxal area narrow. Metepimeron almost as long as wide. Metacoxa about four times as wide as metacoxal process. Metanepisternum about four times as long as wide. Ventrite I sparsely and coarsely punctuate, with row of long basal wrinkles and 2 macrosetae; V with 6 macrosetae, sparsely and finely punctuate, and truncate at apex.

Meso- and metafemora with microsculpture, sparsely and coarsely punctuate.

Male. Aedeagus about 0.33 mm long; parameres symmetrical and enlarged at apex ( Fig. 75 ), with setose; inner sac with a rod-like sclerite ( Fig. 74 ).

Female. Distal gonocoxite normal and setose (Fig. 57); vagina membranous, without robust sclerites; bursa copulatrix not sclerotized.

Measurements (n = 3). Length (PL+EL): 1.63–1.78 mm; width (PW, EW): 0.90–1.01 mm, 1.00– 1.10 mm. PL/PW: 0.67–0.70; EL/EW: 0.98–1.04. HW: 0.43–0.49 mm. ID: 0.25 mm.

Approximate ratio of each antennal length (width) as follows (n = 1); 1.5 (0.7): 1.5 (0.7): 1.0 (0.3): 1.1 (0.3): 1.3 (0.3): 1.1 (0.3): 1.5 (0.5): 1.3 (0.4): 1.5 (0.5): 1.4 (0.5): 1.6 (0.7).

Specimens examined. 131Ƥ, Kamibisei, Memuro, Hokkaido, 25. VIII. 1995, M. Sakai leg.; 13, Hontani, Odamiyama, Ehime Pref., 13. IX. 1994, E. Yamamoto leg. (All preserved in EUMJ).

Distribution. Japan: Hokkaido, Honshu, Shikoku, Kyushu.

Figures

FIGURES 11 – 23. Habitus in lateral view of the Japanese Baeocera, and Baeoceroxidium micros (20, 21) and Baeocera falsata (22, 23). 11, B. frater; 12, B. myrmidon; 13, B. sordida; 14, B. abnormalis; 15, B. caliginosa; 16, B. curtula; 17, B. nakanei; 18, B. takizawai; 19, B. satana; 20, 22, dorsal view; 21, 23, lateral view. Scales: 1.0 mm.

FIGURES 68 – 75. Parameres (68, 69) and aedeagus (70 – 75), dorsal views (68 – 74) and lateral view (75). 68, 70, Baeocera nakanei; 69, 71, B. takizawai; 72, B. satana; 73, B. falsata; 74, 75, Baeoceroxidium micros. Scales: 0.2 mm.