Georissus (Georissus) babai Satô, 1970

Yasuda, Kohei & Yoshitomi, Hiroyuki, 2022, Revision of the genus Georissus (Coleoptera, Hydrophiloidea, Georissidae) of Japan, European Journal of Taxonomy 817 (1), pp. 111-142 : 117-121

Georissus (Georissus) babai Satô, 1970

[Japanese name: Baba-marudoromushi]

Figs 2B , 3A, G , 5B , 6B , 7B , 8B , 9B , 10B ; Table 1

Georyssus babai Satô, 1970: 199 .

Georissus (Georissus) babai – Satô 1972: 209; 1981: 3; 1985: 205. — Hansen 1999: 50.

Diagnosis

This species resembles the palearctic species G. crenulatus , and is distinguished from the latter by the granulation of the frons: G. babai has large granules on the median and lateral portions whereas G. crenulatus only on the median portion.

Material examined

Holotype JAPAN – Honshu : Niigata Pref. • ♂; Echigo, Sasaguchi-hama; 26 Apr. 1959; K. Baba leg.; EUMJ ( Fig. 3 A, K ).

Paratypes JAPAN – Honshu: Niigata Pref. • 2 ex.; same collection data as for holotype; EUMJ • 2 ex.; N-Echigo , Nakajo ; 3 May 1959; K. Baba leg.; EUMJ .

Other material

JAPAN – Honshu: Niigata Pref. • 16 ex.; Sasaguchi-hama; 10 May. 1961; K. Baba leg.; EUMJ • 1 ex.; Sasaguchi-hama ; 26 Apr. 1959; K. Baba leg.; EUMJ .

Redescription

COLORATION ( Fig. 2B ). Black to dark reddish brown, weakly shining.

HEAD ( Fig. 6B ). Clypeus uneven, provided with bearing large granules on anterior portion extensively; slr consisted of large granules. Frons provided with large granules along the anterior to lateral margin; longitudinal groove distinct and narrow, surrounded granules only anterior portion; lsa relatively wide, slightly curving inside.

PRONOTUM ( Fig. 7B ). Relatively large, widest at the posterior third. Anterior portion provided with short grooves and small deep foveae; anterior margin slightly crenelated; smlg shallow, with short longitudinal grooves. Posterior portion smooth, lacking granules; longitudinal groove indistinct. Lateral margin except anterior portion regularly bearing granules; slb indistinct, sparsely with large granules; pg relatively long and narrow.

ELYTRA. Widest at the middle, as wide as maximum width of pronotum in basal margin; suture and intervals not elevated, intervals bearing distinct punctures; humeral bulges poorly developed. Lateral ridges indistinct.

ABDOMEN ( Fig. 9B ). Lateral margin of ventrites gradually narrowing posterior, ventrites 1 and 2 strongly narrowing. Teeth of ventrite 1 large; teeth of ventrite 2 indistinct. Granulation of ventrites 2–5 distinct, large.

MALE GENITALIA ( Fig. 9B ). Aedeagus 0.42 mm long. Parameres slightly shorter than phallobase, their basal portions combined as wide as anterior portion of phallobase; lateral margins bulbous at apical portion; internal margins subparallel-sided, with long setae densely at apical portion. Median lobe shorter than parameres, subparallel-sided, slightly angular at apex; basal struts relatively long. Phallobase about 2.0 times as long as wide, slightly widening posteriorly: posterior portion with large basal foramen.

FEMALE GENITALIA ( Fig. 10B ). Latero-tergites 8 forming acute angle; apex strongly incurved. Setae of gonostylus long.

Biological notes

This species was collected using a pitfall trap at a sandy place with Imperata cylindrica (L.) Raeusch. ( Poaceae ) in Shizuoka Prefecture ( Tabira & Ishikawa 2011). But there have been no additional records from Niigata Prefecture, the type locality of this species.

Distribution

Japan: Honshu (Niigata and Shizuoka Prefs) ( 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. 3. Holotypes of Georissus spp. A–F. Dorsal habitus. G–L. Labels. A, K. G. (G.) babai Satô, 1970, ♂ (EUMJ). B, L. G. (Ni.) granulosus Satô, 1972, ♀ (EUMJ). C, H. G. (Ne.) kurosawai Nakane, 1963, ♂ (SEHU). D, J. G. (Ne.) japonicus Satô, 1972, ♂ (EUMJ). E, G. G. (Ne.) sakaii Satô, 1972, ♂ (EUMJ). F, I. G. (Ne.) katsuoi Nakane, 1995 (SEHU). 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. 13. Distribution map of Georissus spp. Russian localities for Georissus (G.) canalifer Sharp, 1888 and G. (Ne.) japonicus Satô, 1972 are omitted.