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).