Baeocera sordida Löbl, 1984

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 : 316

Baeocera sordida Löbl, 1984

( Figs. 4 , 13 , 26, 51, 64, 79, 80)

Baeocera sordida Löbl, 1984b: 183

Diagnosis. Antennomere XI about twice as long as III. Elytral punctuation sparse and fine. Mesocoxal area slightly broadened. Lateral portion of metaventrite sparsely and coarsely punctuate. Ventrite I sparsely and finely punctuate. Distal gonocoxite elongate and tapering apically. Parameres symmetrical.

Redescription. Body oval, shining. Pronotum and elytra black to dark reddish-brown; frons, clypeus, labrum, tibiae and femora reddish-brown; maxillary palpi, tarsi and antennomeres I–IV yellowish-brown; antennomeres V– XI dark yellowish-brown; head black. Head, pronotum and elytra sparsely and finely pubescent.

Head with interocular distance about twice as eye width. Punctuation sparse and fine. Antennomeres I–VI with a few macrosetae, VII–XI covered with some macrosetae; XI about twice as long as III (Fig. 26).

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

Elytra almost as wide as long, widest at basal fourth, lateral margins gradually narrowed apically, minutely serrate at inner part of posterior margin. Elytral punctuation sparse and fine ( Fig. 80 ). Sutural striae extending outwards along basal margin to form complete basal stria joined to lateral striae.

Propygidium and pygidium sparsely and finely punctuate; pygidium weakly concave, with 2 macrosetae.

Hypomeron impunctuate. Mesoventrite sparsely and finely punctuate, as pronotum. Lateral portion of metaventrite sparsely and coarsely punctuate. Mesepimeron about twice as long as wide. Mesocoxa about twice as wide as interspace between mesocoxa; mesocoxal area moderately broadened. Metepimeron almost as long as wide. Metacoxa about twice as wide as metacoxal process. Metanepisternum about four times as long as wide. Ventrite I with 4 macrosetae, sparsely and finely punctuate; V with 8 macrosetae, sparsely and finely punctuate, and concave at middle portion of apex.

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

Male. Aedeagus about 0.36 mm long; parameres symmetrical; inner sac with rod-like sclerites ( Fig. 64 ).

Female. Distal gonocoxite elongate and tapering apically (Fig. 51); vagina membranous, without robust sclerites; bursa copulatrix not sclerotized.

Measurements (n = 18). Length (PL+EL): 1.56–1.96mm; width (PW, EW): 0.79–1.03 mm, 0.85–1.13 mm. PL/PW: 0.75–0.83; EL/EW: 0.98–1.09. HW: 0.36–0.44 mm. ID: 0.15–0.21 mm.

Approximate ratio of each antennal length (width) as follows (n = 1); 1.8 (0.9): 1.6 (0.9): 1.0 (0.4): 1.2 (0.4): 1.4 (0.4): 1.2 (0.4): 1.5 (0.6): 1.3 (0.5): 1.6 (0.7): 1.7 (0.8): 2.0 (0.9).

Specimens examined. 1 ex., Sandankyo, Aki, 5. V. 1969, unknown leg.; 1 ex., Mt. Shiratsue, Ehime Pref., 19. VII. 1972, S. Kinoshita leg.; 1 ex., Banshodani near Tsuchigoya, Ehime Pref., 18. VII. 1981, K. Sasagawa leg.; 1Ƥ, Mt. Saragamine, Shigenobu-Town, Ehime Pref., 5. VI. 1999, H. Nakanishi leg.; 1Ƥ, 1ex., Namakusa-rindo, Odamiyama, Ehime Pref., 25. X. 1994, E. Yamamoto leg.; 1Ƥ, 1ex., Yoshinogawa, Oda-cho, Ehime Pref., 2. IX. 1993, M. Kawanabe leg.; 1Ƥ, Mt. Saragamine, Toon-City, Ehime Pref., alt. 1100–1270 m, 5. VII. 2008, Y. Yamauchi leg.; 1Ƥ, Mt. Takanawa, Ehime Pref., 24. V. 1974, Y. Notsu leg.; 13, Mt. Saragamine, Kumakogen-cho, Ehime Pref., 7. VI. 2008, T. Ichiyanagi leg.; 131Ƥ, Komeno-Town, Matsuyama-City, Ehime Pref., 7. V. 2009, S. Matsuo leg.; 1Ƥ, University Forest of Ehime University, The second forest group, Komeno-Town, Matsuyama- City, 30. V. 2009, R. Ogawa leg.; 1 ex., Yokono, Nishidani, Yanadani-mura, Ehime Pref., in bamboo litter, 16. X. 1993, M. Sakai leg.; 1Ƥ, Mt. Takashiro, Tokushima Pref., alt. 1500–1550 m, 17. VII. 1988, M. Sakai leg.; 1 ex., Kami-oriwatari, Yusuhara-cho, Kochi Pref., in litter, 14. VI. 1997, M. Sakai leg.; 1 ex., Mt. Tsurugi (Minokoshi), Higashi-iyayama-mura, Tokushima Pref., alt. 1400–1500 m, dieback of Fagus crenata , 6. VIII. 2004, T. Kurihara leg.; 13, Mt. Tatera, Tsushima Is., Nagasaki Pref., 5. V. 1978, A. Oda leg. (All preserved in EUMJ).

Distribution. Japan: Honshu, Shikoku, Kyushu.

Figures

FIGURES 2 – 10. Habitus in dorsal view of the Japanese Baeocera. 2, B. frater; 3, B. myrmidon; 4, B. sordida; 5, B. abnormalis; 6, B. caliginosa; 7, B. curtula; 8, B. nakanei; 9, B. takizawai; 10, B. satana. Scales: 1.0 mm.

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 76 – 83. SEM photographs. 76, Meso- and metaventrites; 77, labium and maxillae in ventral view (left) and mandible in dorsal view (right); 78, prothoracic corbiculum; 79, ctenidium of profemur; 80, 81, punctuations of elytra; 82, inner surface of elytra; 83, intersegmental membrane. 76 (left), Baeocera caliginosa; 76 and 77 (right), 78, 81, 83, B. nakanei; 77 (left), 82, B. abnormalis; 79, 80, B. sordida.

FIGURES 62 – 67. Aedeagus, dorsal view. 62, Baeocera frater; 63, B. myrmidon; 64, B. sordida; 65. B. abnormalis; 66, B. caliginosa; 67, B. curtula. Scales: 0.2 mm.