Cephalobyrrhus japonicus Champion, 1925

Yoshitomi, Hiroyuki, 2019, Revision of the genus Cephalobyrrhus of Japan and Taiwan (Coleoptera, Limnichidae), ZooKeys 817, pp. 61-72 : 63-67

Cephalobyrrhus japonicus Champion, 1925 Figs 1B, 2 A–D, F, 3 H–N, 5 A–B Japanese name: Oome-hoso-chibidoromushi

Cephalobyrrhus japonicus : Champion 1925: 176; Satô 1966: 62; Pütz 1991: 132; 1998: 352.

Specimens examined.

[Honshu] Tokyo Met. 15 exs. (SEHU), Nippara, 24.VI.1969, H Takizawa leg.; 26 exs. (SEHU), Takao-san, 20.VI.1969, H Takizawa leg. Chiba Pref. 3 exs. (EUMJ), Orikisawa, Kimitsu-shi, 12.VI.2013, A Saito leg. Kanagawa Pref. 3 exs. (EUMJ), Miyanoshita, 1.VI.1895; 1 ex. (EUMJ), Yokohama. Yamanashi Pref. 3 exs. (EUMJ), Koganezawa-rindo, 29.VI.1975, S Tsuyuki leg.; Nagano Pref. 1 ex. (EUMJ), Shimajima, 22.VII.1967, M Tomokuni leg. Aichi Pref. 2 exs. (EUMJ), Hongu-san, 15.VI.1991, M Satô leg. Mie Pref. 1 ex. (EUMJ), Hirakura, Misugi-mura, 14.VII.1993, N Kanie leg.; 1 ex. (EUMJ), same loc., 19.VI.1955, Z Naruse leg.; 1 ex. (EUMJ), same loc., 24.VIII.1956, M Satô leg. Gifu Pref. 1 ex. (EUMJ), Suhara, 24.V.1955, K Ohbayashi leg.; 1 ex. (EUMJ), Uchibami-dani, Itadori-mura, 1.VII.1973, Y Hori leg.; 4 exs. (EUMJ), Wara-gawa, 24.VIII.1967, M Satô leg. Tottori Pref. 1 ex. (EUMJ), Daisenji, Daisen, 8.VII.1971, S. Hisamatsu leg. [Shikoku] Ehime Pref. 1 ex. (EUMJ), Fukumi-gawa, 20.VI.1986, S Hisamatsu leg.; 1 ex. (EUMJ), Ishizuchi-san, 16-17.VII.1977, M Tomokuni leg.; 1 ex. (EUMJ), Koguchi, 26.VII.1958, M Miyatake leg.; 1 ex. (EUMJ), Komenono, Matsuyama-shi, 4.VII.1978, Y Seiyama leg.; 2 exs. (EUMJ), same loc., 14.VI.1978, Y Seiyama leg.; 1 ex. (EUMJ), same loc., 4.VII.1974, Y Notsu leg.; 1 ex. (EUMJ), same loc., 13.VI.1976, Y Notsu leg.; 1 ex. (EUMJ), same loc., 23.VI.1977, A Oda leg.; 1 ex. (EUMJ), same loc., 28.VI.1970, M Sakai leg.; 1 ex. (EUMJ), Matsubagawa, 8.VII.1961, M Miyatake leg.; 1 ex. (EUMJ), Myojingamori, 26.VI.1966, S Hisamatsu leg.; 3 exs. (EUMJ), Oda-cho, 10.VII.1983, E Yamamoto leg.; 1 ex. (EUMJ), Odamiyama, 21.VII.1993, M Sakai leg.; 1 ex. (EUMJ), same loc., 27.VI.1972, M Sakai leg.; 1 ex. (EUMJ), same loc., 16.VIII.1972, M Sakai leg.; 2 exs. (EUMJ), same loc., 1-2.VII.1995, N Ohbayashi leg.; 1 ex. (EUMJ), same loc., 18.V.1986, E Yamamoto leg.; 1 ex. (EUMJ), same loc., 19.VII.1993, K Okada leg.; 14 exs. (EUMJ), Ohnogahara, 4.VII.1977, A Oda leg.; 2 exs. (EUMJ), same loc., 11.VII.1965, N Ohbayashi leg.; 3 exs. (EUMJ), same loc., 28.V.1980, A Sakai leg.; 4 exs. (EUMJ), same loc., 6.VII.1979, Y Seiyama leg.; 1 ex. (EUMJ), same loc., 14.VII.1981, M Kotani leg.; 3 exs. (EUMJ), same loc., 14.VII.1981, K Sasagawa leg.; 17 exs. (EUMJ), Omogokei, 26.VI.1951, M Miyatake leg.; 3 exs. (EUMJ), same loc., 15-17.VI.1956, M Miyatake leg.; 6 exs. (EUMJ), same loc., 12-13.VI.1954, S Hisamatsu leg.; 3 exs. (EUMJ), same loc., 19.VI.1955, M Miyatake leg.; 2 exs. (EUMJ), same loc., 26.VI.1955, S Hisamatsu leg.; 6 exs. (EUMJ), same loc., 2.VII.1978, A Oda leg.; 8 exs. (EUMJ), same loc., 29.VI.1963, M Miyatake leg.; 7 exs. (EUMJ), same loc., 21.VII.1979, M Satô leg.; 3 exs. (EUMJ), same loc., 17.VII.1977, A Oda leg.; 1 ex. (EUMJ), same loc., 20.VI.1981, K Sasagawa leg.; 1 ex. (EUMJ), same loc., 14.VII.1981, K Sasagawa leg.; 4 exs. (EUMJ), same loc., 18.VI.1986, T Nagata leg.; 1 ex. (EUMJ), same loc., 12.VI.1959, M Miyatake leg.; 23 exs. (EUMJ), Oonaru, Omogo, 13-14.VI.1998, T. Kan et al. leg.; 2 exs. (EUMJ), Saragamine, 26-27.VI.1959, M Satô leg.; 1 ex. (EUMJ), Shiraitono-taki, 30.VI.1978, I Amano leg.; 3 exs. (EUMJ), Shiratsue, 10-11.VI.1972, M Sakai leg.; 1 ex. (EUMJ), same loc., 19.VI.1966, S Hisamatsu leg.; 1 ex. (EUMJ), Sugitate, Matsuyama-shi, 14.VI.1955, Y Wake leg.; 1 ex. (EUMJ), Wakayama, Kumakogen-cho, 28.VI.2009, K Hashimoto leg. Kagawa Pref. 1 ex. (EUMJ), Daisenzan, Kotonami-cho, 9.VI.2002, Y Kamite leg. Tokushima Pref. 1 ex. (EUMJ), Mimune, Higashi-iya, 2-3.VIII.1969, S Kinoshita leg.; 2 exs. (EUMJ), Takashiro-yama, 17.VII.1988, M Sakai leg.; 1 ex. (EUMJ), same loc., 18.VII.1978, A Oda leg.; 1 ex. (EUMJ), same loc., 18.VII.1978, M Tomokuni leg.; 9 exs. (EUMJ), Tsurugi, 11-12.VII.1976, S Hisamatsu et al. leg. Kochi Pref. 11 exs. (EUMJ), Kage, 11.VI.1971, M Tomokuni leg.; 5 exs. (EUMJ), Kamioriwatari, Yusuhara, 14-15.VI.1997, M Sakai leg.; 5 exs. (EUMJ), Kuroson, 21.VI.1999, M Sakai leg.; 1 ex. (EUMJ), same loc., 15.VII.1953, E Edashige leg.; 3 exs. (EUMJ), Shimooriwatari, Yusuhara, 14-15.VI.1997, N Ohbayashi leg.; 15 exs. (EUMJ), Tebako-yama, 9-11.VI.1960, M Miyatake leg. [Kyushu] Fukuoka Pref. 3 exs. (EUMJ), Hikosan, 7.VII.1957, M. Miyatake leg.; 5 exs. (EUMJ), same loc., 12.VII.2002, J Ogawa leg.; 1 ex. (EUMJ), Ukiha-cho, 18.VII.1956, N Gyotoku leg. Nagasaki Pref. 1 ex. (EUMJ), Sasuna, Kamiagata, 22.VI.2002, T Kurihara leg.; 1 ex. (EUMJ), same loc., 16.VII.2000, J Ogawa leg. Kumamoto Pref. 2 exs. (EUMJ), Hagi, Izumi-mura, 4.V.1988, K Ishida leg.; 1 ex. (EUMJ), same loc., 3.V.1988, K Ishida leg.; 5 exs. (EUMJ), Ichibusa, Mizukami-mura, 8.VI.1967, S Hisamatsu leg.; 4 exs. (EUMJ), same loc., 11.VI.1972, S Hisamatsu leg.; 1 ex. (EUMJ), Nabenodaira, Takamori, 18.VII.1968, S Kinoshita leg. Oita Pref. 2 exs. (EUMJ), Kozubaru, 9-11.VII.1968, S Kinoshita leg.; 2 exs. (EUMJ), Kurodake, Naoiri-gun, 16.VI.1979, S Nagai leg.; 4 exs. (EUMJ), Kyusuikei, Kusu-gun, 16.VI.1979, S Nagai leg. Miyazaki Pref. 1 ex. (EUMJ), Ebino-kogen, Ebino-cho, 14.VII.2002, J Ogawa leg.; 1 ex. (EUMJ), Shiraiwa-yama, Higashi-usuki, 19.VII.1968, S Kinoshita leg.; 27 exs. (EUMJ), Sobo-san, 6.VII.1980, Y Seiyama leg. Kagoshima Pref. 4 exs. (SEHU), Yakushima, 7.VI.1969, K Kushigemati leg.

Description.

Adults. For full description see Pütz (1991). Antennae (Fig. 2F) long; approximate ratio of each antennomere (n = 1) as 1.85: 1.08: 1.38: 1.08: 1.38: 1.23: 1.23: 1.08: 1.00: 1.00: 1.38. PW/PL 1.51-1.90 (1.68); EL/EW 1.43-1.68 (1.56); EL/PL 2.85-3.76 (3.23); EW/PW 1.15-1.30 (1.23); TL/EW 1.94-2.15 (2.04).

Male. Sternite VIII (Fig. 3K) membranous, transverse. Sternite IX (Fig. 3L) with long lateral struts. Aegeagus about 0.6 mm; phallobase subparallel-sided, with straight basal projection; parameres relatively wide, curved interiorly and rather pointed at apices, 0.42 times as long as phallobase; median lobe straight in sides, obtuse at apex, 0.78 times as long as parameres.

Female. Spiculum ventral (Fig. 3M) long, as long as ovipositor. Ovipositor (Fig. 3N) well sclerotized, long; coxite sharply pointed at apices; approximate ratio of coxite and baculus (n = 1) as 1.0: 3.9.

Measurements of adults (unsexed; n = 20). TL 2.38-4.02 (3.04) mm; PW 0.95-1.65 (1.21) mm; PL 0.50-1.00 (0.72) mm; EL 1.88-3.02 (2.32) mm; EW 1.20-1.95 (1.49) mm.

Distribution.

Japan (Honshu, Shikoku, Kyushu, Tsushima, Yakushima).

Remarks.

This record is the first of this species from Tsushima.

Biological notes.

This species lives in natural forests (particularly in the Japanese beech tree zone, above ca. 1,000 m elevation) near a small stream (Fig. 5A, B). The adults were observed on the surface of rocks and fallen rotten wood during the daytime, and were sometimes attracted to light. Overwintering probably occurs in the larval stage. Immature stages are unknown.