Lathrobium satoi Watanabe 2003
Creators: name: Senda, Yoshihiro
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Lathrobium
Lathrobium satoi

description: Lathrobium satoi Watanabe, 2003
(Figs. 11, 12)
Lathrobium satoi Watanabe, 2003: 151 [original description].— Assing, 2013: 1638 [listed].— Schülke & Smetana, 2015: 956 [catalogued].— Assing, 2019: 104 [listed].
Type material. Not examined.
Material examined. JAPAN: Honshu: [Aichi Pref.] 8♂♂, 1♀ (1 ♂ slightly teneral), Mennoki-tôge, 20.IX.1978, M. Satô leg. (EUMJ); 2♂♂, 1♀, same locality, but 10.VIII.2020, T. Ôno leg. (pcYS); 4♂♂, 2♀♀, ditto, but 12.IX.2020 (pcYS); 2♀♀, ditto, but 14.IX.2020 (pcYS); 3♂♂, 2♀♀, Takadoya, Otagi-chô, Toyota-shi, 28.IV.2022, T. Ôno leg. (pcYS); 2♂♂, 4♀♀, Dando-uradani, Shitara-chô, 20.IX.1978, M. Satô leg. (EUMJ).
Redescription. For a detailed description including male genital organs, see Watanabe (2003).
Male. Dorsal habitus as shown in Fig. 11A. Length/width ratio of each antennomere I to XI as follows: 2.7, 1.7, 1.4, 1.4, 1.4, 1.4, 1.3, 1.3, 1.3, 1.3, 2.3; relative lengths of antennomeres from base to apex: 25.8: 12.5: 11.9: 11.1: 11.1: 10.8: 10.0: 10.0: 10.0: 10.0: 16.1, and relative widths: 14.0: 10.8: 12.4: 11.2: 11.2: 11.2: 11.2: 11.2: 11.2: 11.2: 10.0. HL/HW ≈ 1.0; AL/FBL ≈ 0.6; PL/PW ≈ 1.2; PL/HL ≈ 1.4; PW/HW ≈ 1.1; EL/EW ≈ 0.8; EL/PL ≈ 0.8; EW/PW ≈ 1.1.
Abdominal sternites VI–VIII as shown in Fig. 11B.
Aedeagus as shown in Fig. 11C–E. Endophallus (Fig. 11F & G): internal sac slightly longer than dorsal plate, simple, symmetric, but weakly curved to right, without any membranous projection in everted condition, with ventrolateral teeth patch as Fig. 11F; sclerotised copulatory piece lacking, but with numerous minute sclerites on dorsal side of apex.
Female. Length/width ratio of each antennomere I to XI as follows: 2.5, 1.2, 1.2, 1.2, 1.2, 1.4, 1.3, 1.3, 1.4, 1.3, 2.3; relative lengths of antennomeres from base to apex: 30.0: 12.0: 12.0: 11.0: 11.0: 11.0: 10.0: 10.0: 11.0: 12.0: 18.0, and relative widths: 15.0: 12.5: 12.5: 11.3: 11.3: 10.0: 10.0: 10.0: 10.0: 11.3: 10.0. HL/HW ≈ 1.0; AL/FBL ≈ 0.6; PL/PW ≈ 1.2; PL/HL ≈ 1.4; PW/HW ≈ 1.1; EL/EW ≈ 0.8; EL/PL ≈ 0.8; EW/PW ≈ 1.1.
Tergum VIII feebly emarginate at middle of posterior margin (Fig. 11H); sternite VIII (Fig. 11I) projected apically, slightly truncate at middle of posterior margin, which is fringed with micropubescence; tergum IX (Fig. 11H & I) similar to male, but with large triangular flap-like ventral plate on base; tergum X (Fig. 11H) similar to male. Gonocoxites (Fig. 11I): lateral gonocoxal plate (distal and proximal gonocoxites fused) elongate, setigerous, with few setae in apical area, with rounded apex.
Measurements. Male (n = 12)—BL: 7.32–7.85 mm (7.55± 0.20 mm); FBL: 3.12–3.32 mm (3.21± 0.06 mm); HL: 0.91–0.97 mm (0.94± 0.02 mm); HW: 0.95–1.01 mm (0.97± 0.02 mm); AL: 1.80–1.88 mm (1.85± 0.02 mm); PL: 1.22–1.35 mm (1.29± 0.04 mm); PW: 1.03–1.12 mm (1.08± 0.03 mm); ELL: 0.95–1.03 mm (0.98± 0.02 mm); ELW: 1.13–1.21 mm (1.17± 0.03 mm).
Female (n = 3)—BL: 7.14–7.26 mm (7.19± 0.06 mm); FBL: 2.96–3.05 mm (3.01± 0.04 mm); HL: 0.87–0.90 mm (0.89± 0.02 mm); HW: 0.88–0.90 mm (0.89± 0.01 mm); AL: 1.63–1.72 mm (1.69± 0.05 mm); PL: 1.19–1.22 mm (1.21± 0.02 mm); PW: 0.98–1.01 mm (1.00± 0.02 mm); EL: 0.90–0.92 mm (0.91± 0.01 mm); EW: 1.08–1.17 mm (1.13± 0.05 mm).
Only individuals collected in the type locality were measured.
Distribution. Japan: Central Honshu (Aichi Prefecture) (Fig. 12).
Comments. This species was originally described from “near Mennoki-tôge, Irabu-chô” (probably misread Inabu-chô, now Toyota-shi), Aichi (Watanabe, 2003) and was previously known only from the type locality.
description: Published as part of Senda, Yoshihiro, 2024, Seven new species of the genus Lathrobium Gravenhorst (Coleoptera: Staphylinidae: Paederinae) from Central Honshu, Japan, with new distributional records, pp. 501-529 in Zootaxa 5403 (5) on pages 520-522, DOI: 10.11646/zootaxa.5403.5.1, http://zenodo.org/record/10562427