Lathrobium fukuense Y. Sato 2023, sp. nov.
Creators: name: Sato, Yuya
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Lathrobium
Lathrobium fukuense

description: Lathrobium fukuense Y. Sato sp. nov.
(Figs. 3, 4, 5)
[Japanese name: Fukue-hime-kobane-naga-hanekakushi]
Type series. Holotype: male, Japan: Kyushu, “ JAPAN: Nagasaki-ken / Goto-shi / Nanadake Shirine / 10. X. 2022. / Y. Sato & T. Hashizume” (KUM). Paratype: 2 males, 1 female, same data as holotype (KUM); 2 males, 1 female, “ JAPAN: Nagasaki-ken / Goto-shi / Nanatsudake Trail Entrance Park / 10. X. 2022. / Y. Sato & T. Hashizume” (KUM).
Description. BL = 5.5–7.3 mm, FBL = 2.4–2.9 mm (n = 7) Coloration: Body (Fig. 3–A) brownish black, moderately shining, with frons, labrum, mandible reddish brown; antennae, maxillary palpi, legs orangish brown; elytra reddish black but sutural reddish brown; abdomen reddish brown; posterior margin of tergite VII and VIII brownish red; tergite IX and X brownish yellow.
Head slightly transverse with HW/HL = 1.14, widest at the basal 1/4 of head; frontal area flattened; surface coarsely and punctate, punctations sparser on frons and vertex, gradually becoming denser toward posterior and lateral margins, with dark brown setae. Eyes small and slightly protruding; longitudinal diameter about 1/3 as long as temple in dorsal view. Antennae elongate, AL/HL = 2.31; antennomere 1 slightly robust and widest at the middle point; antennomeres 2 and 3 slightly oblong; antennomeres 4–10 nearly circle; antennomere 11 fusiform; relative length of antennomeres as follows: 20.68: 12.71: 12.20: 12.20: 10.00: 10.00: 10.17: 10.00: 10.00: 10.00: 15.42; relative maximum width of antennomeres as follows: 16.56: 11.88: 11.88: 10.00: 10.00: 10.00: 10.00: 10.00: 10.00: 10.00: 12.50.
Pronotum oblong, PL/PW = 1.22, PL/HL = 1.47, PW/HW = 1.05; widest at apical 1/5; lateral sides of pronotum almost straight, feebly dilated to widest point, thence gradually convergent toward posterior margin, all corners obtusely rounded; disc sparsely covered with coarse and weak punctations except medial longitudinal line; punctations slightly sparser and less than head, with brownish black setae.
Scutellum shield with some punctations and both anterior and posterior scutellar ridges. Elytra subtrapezoidal and widened posteriorly, EW/EL = 1.69, EL/PL = 0.52, EW/PW = 1.09; lateral side almost straight; posterior corners rounded; disc covered with sparse and coarse punctations, gently shining; punctations denser than on pronotum, with brownish black setae. Hind wing completely reduced. Legs shortened; tibiae and tarsi clothed with golden setae, tarsomeres 1–4 of protarsus dilated.
Abdomen elongate, gradually dilated from segment III–V, thence contracted to the posterior end; each tergite covered with minute punctations and dark brown setae, clothed distinctly long setae on each side near posterior margin; tergite X as long as posterolateral processes of tergite IX.
Male. Sternite VII (Fig. 3–B) transverse, with a shallow depression at posteromedian area; posterior margin almost straight; several setae at posteromedian area grown toward interior; sternite VIII (Fig. 3–C) elongate, without posteromedian impression; posterior margin rounded, with long setae; sternite IX elongate.
Aedeagus (Figs. 4–A, B, C) 1. 53 mm long, elongate; ventral process conspicuously long and slender, well sclerotized and nearly symmetrical, with one weak ridge at median area from apical 1/3 to apex; apex of ventral process gently rounded; each lateral side of ventral process concave at apical 1/3, curved ventrally from 1/2 to apex; the part above basal foremen rounded, with two projections at antero-lateral side; dorsal plate sclerotized and slender, widest at basal 1/4, gradually dilated to widest point at basal 1/4, thus contracted toward acute apex; middle area remarkably widen, with small hook in apex, curved dorsally from 1/2 to apex; apical part slightly curved right side in dorsal view; internal sac including about 20 sclerotized spines; sclerotized spines as thin triangles, forming two lines vertically; patch of several spines at apex.
Female. Sternite VIII (Fig. 1–D) elongate, densely fringed with numerous setae.
Diagnosis. This new species is similar to Lathrobium horridum Assing, 2013, which is described from Mt. Houman-zan, Fukuoka Pref. and belongs to the Lathrobium brachypterum group (Senda 2020), in the general appearance and the aedeagal structure. However, the new species can be distinguished from it by the following characteristics: 1) internal sac with many sclerotized spines; 2) relatively smaller BL (5.5–7.3 mm); 3) sternite VIII without posteromedian impression; 4) each lateral side of ventral process of aedeagus with concavity at apical 1/3; 5) dorsal plate of aedeagus widened at middle area (while in L. horridum: BL = 6.7–8.0 mm; sternite VIII with a shallow posteromedian impression; each lateral side of ventral process of aedeagus straight; dorsal plate of aedeagus slender; internal sac without sclerotized structures).
Etymology. The specific name of new species is derived from the type locality, “Fukue-jima”.
Distribution. Japan (Fukue-jima, Gotô Islands, north of Kyushu).
Habitat. All specimens were corrected under leaf litter.
description: Published as part of Sato, Yuya, 2023, Two new species of the genus Lathrobium (Coleoptera: Staphylinidae: Paederinae) from Gotô Islands, Japan, pp. 278-286 in Zootaxa 5254 (2) on pages 281-285, DOI: 10.11646/zootaxa.5254.2.7, http://zenodo.org/record/7727487