Georissus (Neogeorissus) satoi, Yasuda & Yoshitomi, 2022

Yasuda, Kohei & Yoshitomi, Hiroyuki, 2022, Revision of the genus Georissus (Coleoptera, Hydrophiloidea, Georissidae) of Japan, European Journal of Taxonomy 817 (1), pp. 111-142 : 133-139

Georissus (Neogeorissus) satoi sp. nov.

urn:lsid:zoobank.org:act:DF948D8E-140F-4235-A1EE-41ED5B81A389

[Japanese name: Satô-marudoromushi]

Figs 2G , 5I , 6I , 7I , 8I , 9H , 10F , 11D, H ; Table 2

Diagnosis

This species is easily distinguished from other Japanese species of Georissus by the dark reddish body and body shape; elytra projecting laterally; granules on elytra projecting and forming serration. This species resembles G. lateralis Delève, 1969 and G. calculus Delève, 1967 , and is distinguished from them by more arcuate in lateral margins of parameres ( Delève 1967b, 1969). Georissus smetanai Fikáček, 2012 , leaf litter inhabiting species described from Sabah, Malaysia is also similar to G. satoi sp. nov., but the granulation on the pronotum is different (Fikáček 2012).

Etymology

This species name is dedicated to the late Dr Masataka Satô, who made a great contribution to entomology in Japan.

Material examined

Holotype JAPAN – Okinawa: Ishigaki-jima • 1ex.; Yonehara ; 20 Oct. 1998, K. Takahashi leg.; EUMJ.

Paratypes JAPAN – Shikoku : Kagawa Pref. • ♂; Takamatsu-shi , Nishiueda-machi ; 20 Apr. 2020; Y. Waki leg.; EUMJ. – Okinawa: Ishigaki-jima • 3 ex.; Buzama-dake ; 17 Oct. 1998; K. Takahashi leg.; EUMJ • 1 ex.; Omoto-tunnel ; 11 Dec. 1998; K. Takahashi leg.; EUMJ • 1 ex.; Banna-dake ; 22 Oct. 1998; K. Takahashi leg.; EUMJ • 2 ex.; Yonehara ; 5 Dec. 1998; K. Takahashi leg.; EUMJ • 3 ex.; Urazoko-rindo ; 27 Sep. 1998; K. Takahashi leg.; EUMJ • 1 ex.; Yonehara ; 17 Oct. 1998; K. Takahashi leg.; EUMJ. – Okinawa: Iriomote-jima • 1 ex.; Taketomi-cho , Sonai-dake ; 10 May 2012; T. Yoshida leg.; EUMJ .

Description

COLORATION ( Fig. 2G ). Dark red, weakly shining. Body surface often covered with white substance.

HEAD ( Fig. 6I ). Clypeus uneven, bearing large granules in median portion, and small granules; slr consisted of granules, granulation of anterior portion dense, in contrast to posterior portion sparse; smb consisted of granules and large tubercles, narrowing posteriorly; lsa with small indistinct granules at anterior portion.

PRONOTUM ( Fig. 7I ). Relatively large, widest at the middle; anterior margin crenellated; smlg relatively wide, granulation sparse, bearing a few small pits. The first half of anterior portion provided with granules densely, in contrast to the last half bearing pits sparsely. Posterior portion strongly convex than anterior potion; cd rhomboid and large, surrounded by granules; sdp oblong oval, larger than cd, surrounded by granules sparsely; slr strongly developed, with large granules; pg relatively wide and short, not reaching median portion of sdp; sdn well developed, provided with many teeth.

ELYTRA. Widest at the middle, slightly wider than pronotum in basal margin; suture and all intervals slightly elevate, regularly bearing distinct granules; granulation projecting and forming serration; punctures distinct and regular. Humeral bulges indistinct. Lateral ridges on each elytron highly elevate, bearing distinct granules. Hind wings not developed.

ABDOMEN ( Fig. 8I ). Lateral margin of ventrites uniformly narrowing posterior. Ventrite 1 with large and sparse granules; serial small bulges arising at anterior margin of ventrite 1 and forming ridge. Granulation of ventrites 2–5 distinct and sparse.

MALE GENITALIA ( Fig. 9H ). Aedeagus 0.35 mm long. Parameres shorter than phallobase, their basal portions combined as wide as anterior portion of phallobase; lateral margins slightly curved at median portion; internal margins slightly bulbous at basal portion. Median lobe longer than parameres, widening basally, angular at apex; basal struts long. Phallobase about 2.5 times as long as wide, slightly widening posteriorly; posterior portion with large basal foramen.

FEMALE GENITALIA. Latero-tergites 8 ( Fig. 10F ) forming obtuse angle; apex strongly incurved. Setae of gonostylus long. Spermatheca ( Fig. 11H ) elongated oval, constricted at basal portion. Bursal sclerite ( Fig. 11D ) large and almost symmetrical, slightly sclerotized.

Biological notes

This species was collected from leaf litter (T. Yoshida pers. comm.).

Distribution

Japan: Shikoku (Kagawa Pref.), Okinawa (Ishigaki-jima, Iriomote-jima) ( Fig. 13 ).

Figures

Fig. 2. Dorsal view of Georissus spp. A. G. (G.) canalifer Sharp, 1888. B. G. (G.) babai Satô, 1970. C. G. (Ni.) granulosus Satô, 1972. D. G. (Ne.) japonicus Satô, 1972. E. G. (Ne.) kurosawai Nakane, 1963. F. G. (Ne.) takahashii sp. nov., holotype, ♂ (EUMJ). G. G. (Ne.) satoi sp. nov., holotype (EUMJ). Scale bars = 0.5 mm.

Fig. 5. Dorsal habitus of Georissus spp. A. G. (G.) canalifer Sharp, 1888. B. G. (G.) babai Satô, 1970. C. G. (Ni.) granulosus Satô, 1972. D. G. (Ne.) japonicus Satô, 1972. E–F. G. (Ne.) kurosawai Nakane, 1963 from Hokkaido (E) and Nagano (F). G–H. G. (Ne.) takahashii sp. nov. from Kochi (G) and Okinawa (H). I. G. (Ne.) satoi sp. nov.

Fig. 6. Head of Georissus spp. A. G. (G.) canalifer Sharp, 1888. B. G. (G.) babai Satô, 1970. C. G. (Ni.) granulosus Satô, 1972. D. G. (Ne.) japonicus Satô, 1972. E–F. G. (Ne.) kurosawai Nakane, 1963 from Hokkaido (E) and Nagano (F). G–H. G. (Ne.) takahashii sp. nov. from Kochi (G) and Okinawa (H). I. G. (Ne.) satoi sp. nov.

Fig. 7. Pronotum of Georissus spp. A. G. (G.) canalifer Sharp, 1888. B. G. (G.) babai Satô, 1970. C. G. (Ni.) granulosus Satô, 1972. D. G. (Ne.) japonicus Satô, 1972. E–F. G. (Ne.) kurosawai Nakane, 1963 from Hokkaido (E) and Nagano (F). G–H. G. (Ne.) takahashii sp. nov. from Kochi (G) and Okinawa (H). I. G. (Ne.) satoi sp. nov.

Fig. 8. Ventrites of Georissus spp. A. G. (G.) canalifer Sharp, 1888. B. G. (G.) babai Satô, 1970. C. G. (Ni.) granulosus Satô, 1972. D. G. (Ne.) japonicus Satô, 1972. E–F. G. (Ne.) kurosawai Nakane, 1963 from Hokkaido (E) and Nagano (F). G–H. G. (Ne.) takahashii sp. nov. from Kochi (G) and Okinawa (F). I. G. (Ne.) satoi sp. nov. Abbreviation: vt = ventral teeth. Scale bars = 100 μm.

Fig. 9. Male aedeagus of Georissus spp. A. G. (G.) canalifer Sharp, 1888. B. G. (G.) babai Satô, 1970. C. G. (Ni.) granulosus Satô, 1972. D. G. (Ne.) japonicus Satô, 1972. E. G. (Ne.) kurosawai Nakane, 1963. F–G. G. (Ne.) takahashii sp. nov. from Kochi (F) and Okinawa (G). H. G. (Ne.) satoi sp. nov. Scale bar = 0.1 mm.

Fig. 10. Female ovipositor of Georissus spp. A. G. (G.) canalifer Sharp, 1888. B. G. (G.) babai Satô, 1970. C. G. (Ne.) japonicus Satô, 1972. D. G. (Ne.) kurosawai Nakane, 1963. E. G. (Ne.) takahashii sp. nov. F. G. (Ne.) satoi sp. nov. Abbreviations: gsty = gonostylus; ltg8 = latero-tergite 8. Scale bar = 0.1 mm.

Fig. 11. Female genital organs of subgenus Neogeorissus spp. A–D. Bursal sclerite. E–H. Spermatheca. A, E. G. (Ne.) japonicus Satô, 1972. B, F. G. (Ne.) kurosawai Nakane, 1963. C, G. G. (Ne.) takahashii sp. nov. D, H. G. (Ne.) satoi sp. nov. Scale bar = 0.1 mm.

Fig. 13. Distribution map of Georissus spp. Russian localities for Georissus (G.) canalifer Sharp, 1888 and G. (Ne.) japonicus Satô, 1972 are omitted.