Georissus (Nipponogeorissus) granulosus Sato 1972
Creators: name: Yasuda, Kohei
name: Yoshitomi, Hiroyuki
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Georissidae
Georissus
Georissus granulosus

description: Georissus (Nipponogeorissus) granulosus Satô, 1972
[Japanese name: Sesuji-marudoromushi]
Figs 2C, 3B, H, 4B, E, H–I, N, 5C, 6C, 7C, 8C, 9C; Table 1
Georissus (Nipponogeorissus) granulosus Satô, 1972: 212.Georissus(Nipponogeorissus)granulosus– Satô 1981: 4; 1985: 205. — Hansen 1999: 49.
Diagnosis
This species is easily distinguished from other Japanese species of Georissus by the granulated pronotum and shape of male aedeagus; shape elongated and narrow, phallobase widening. This species is distinguished from Georissus biroi described from Papua New Guinea by the carinae of frons; G. granulosus has transverse carinae, in contrast to their absence in G. biroi.
Material examined
Holotype JAPAN – Honshu: Mie Pref. • ♀; Tsu-shi, Furukawa; 23 Aug. 1958; H. Ichihashi leg.; EUMJ (Fig. 3B, L).
Other material JAPAN – Honshu: Mie Pref. • 5 ex.; Ise-shi, Iso-cho, Miya-gawa; 16 Jun. 2008; K. Akita leg.; EUMJ.
Redescription
COLORATION (Fig. 2C). Black, mat, legs dark reddish brown.
HEAD (Fig. 6C). Clypeus uneven, provided with foveae and carinae throughout; slr, consisted of granules, connecting to smb at median portion; smb nonsequential, connecting each other, forming oblong oval; lsa connecting each other, forming U-shape.
PRONOTUM (Fig. 7C). Relatively large, widest at the middle. Pronotal disc provided with granules densely. Anterior portion provided with indistinct granules extensively; anterior margin smooth, not crenelated; smlg distinct, with longitudinal row of pits. Posterior portion slightly convex than anterior potion, bearing granulation regularly; lateral margins protruding; slb developed; pg indistinct, short.
ELYTRA. Entirely granulate. Elytral intervals 2, 4, 6 and 8 elevated, forming longitudinal carinae. Humeral bulge distinct, bearing granules. Lateral ridges indistinct. Hind wings developed.
ABDOMEN (Fig. 8C). Lateral margin of ventrites uniformly narrowing posteriorly. Ventrite 1 with large granules extensively. Granulation of ventrites 2–5 large and relatively indistinct.
MALE GENITALIA (Fig. 9C). Aedeagus 0.37 mm long. Parameres slightly shorter than phallobase, basal portions of parameres combined as wide as anterior portion of phallobase; lateral margins. Median lobe shorter than parameres, subparallel-sided, slightly angular at apex; basal struts short. Phallobase about 2.4 times as long as wide, widening posteriorly; posterior portion with large basal foramen.
FEMALE GENITALIA. Not examined.
Biological notes
This species inhabits tidal flats that are submerged at high tide (Akita 2008). The holotype was collected at light (Satô 1981).
Distribution
Japan: Honshu (Mie Pref.) (Fig. 13).
description: Published as part of Yasuda, Kohei & Yoshitomi, Hiroyuki, 2022, Revision of the genus Georissus (Coleoptera, Hydrophiloidea, Georissidae) of Japan, pp. 111-142 in European Journal of Taxonomy 817 (1) on pages 121-123, DOI: 10.5852/ejt.2022.817.1767, http://zenodo.org/record/6517928