Labomimus reitteri Sharp, 1883

Yin, Zi-Wei & Li, Li-Zhen, 2015, Review of some species in the genera Pselaphodes Westwood and Labomimus Sharp (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4040 (3), pp. 331-344 : 335-336

3. Labomimus reitteri Sharp, 1883

( Fig. 3 )

Labomimus reitteri Sharp, 1883: 300 .

Type material examined. Holotype (fixed by monotypy; in BMNH): JAPAN: ♀, with five labels ( Fig. 3 B): ‘ Labomimus reitteri Type D. S. Hakone, Japan. May. 1880 / Japan. G. Lewis. 1910—320 / Type H. T. (round printed label with a red rim) / Hakone 5/80 (May, 1980) / Holotype ♀, Labomimus reitteri Sharp , det. Z.-W. Yin, 2015’ (left profemur, protibia, and protarsus missing).

Other material examined (2 ♂♂, 5 ♀♀; in MHNG). 1 ♂, 2 ♀♀, labeled ‘ Japon, GUNMA, 3 km N Tsumagoi, 1100 m, Löbl, 18.7.1980 ’; 1 ♂, 3 ♀♀, labeled ‘ Japon, NAGANO, J. E. Kogen, N. Park, Shiga, 1500 m, Löbl, 23.7.1980 ’.

Notes on type designation. In the original description, Sharp (1883: 301) explicitly stated: ‘The unique sample is, I presume, a male’ (in fact it is a female), implying that this was the only specimen upon which the new species was based. According to Article 73.1.2, this specimen is a holotype fixed by monotypy.

Diagnosis of male. Reddish brown; body length over 3.5 mm; postgenae moderately expanded laterally, with excavation; antennal club composed of three apical antennomeres; pronotum laterally roundly expanded; metathorax with short metaventral processes; trochanters and femora of the fore and middle legs spinose, metacoxae protuberant; aedeagus with slightly asymmetric median lobe.

Redescription. Male ( Fig. 3 C). Body length 3.58–3.69 mm. Head longer than wide, HL 0.77–0.82 mm, HW 0.66–0.67 mm, postgenae moderately expanded laterally, each with lateral excavation; each eye composed of about 20–23 facets. Distinct antennal club composed of three apical enlarged antennomeres, antennomeres IX–X unmodified ( Fig. 3 D). Pronotum slightly longer than wide, PL 0.76–0.78 mm, PW 1.17–1.25 mm, roundly expanded laterally, disc lacking median longitudinal sulcus. Elytra wider than long, EL 0.89–0.92 mm, EW 1.17– 1.25 mm. Metaventral processes ( Fig. 3 E) short, apically narrowed. Protrochanters, profemora ( Fig. 3 F), mesotrochanters and mesofemora ( Fig. 3 G) spinose, with spine of mesofemora small, ventral margins of metacoxae ( Fig. 3 H) protuberant. Abdomen broad at base and narrowed posteriorly, AL 1.16–1.17 mm, AW 1.17– 1.30 mm. Length of aedeagus 0.67–0.69 mm; aedeagus ( Figs 3 I, 3J) with slightly asymmetric median lobe, endophallus composed of one long and one short sclerites.

Female. Similar to male in general habitus; postgenae rounded, lacking excavation; each eye composed of about 20 facets; antennal club smaller than that of male; metaventrite lacking process. Measurements (data of holotype in brackets): BL 3.52–3.69 (3.69) mm, HL 0.76–0.82 (0.82) mm, HW 0.62–0.63 (0.63) mm, PL 0.73– 0.76 (0.74) mm, PW 0.68–0.72 (0.70) mm, EL 0.86–0.89 (0.89) mm, EW 1.12–1.25 (1.19) mm, AL 1.17–1.24 (1.24) mm, AW 1.20–1.32 (1.29) mm.

Comments and comparison. This species is widely distributed in Honshu, Japan (see ‘Distribution’ below). The additional females collected from Gunma and Nagano are no doubt conspecific with the holotype because they share a same form of the antennae and spins of the legs. The males can thus be associated with the females because they were simultaneously collected. In addition, the aedeagal form ( Figs 3 I, 3J) of the male we examined highly agrees with the illustration provided in Sawada (1961: fig. 12).

Labomimus reitteri is placed in the L. shibatai Sawada species-group (sensu Yin et al. 2013b: 345) by the following character states: 1) laterally expanded postgenae with a distinct excavation, 2) the pronotum with rounded lateral margins, and 3) metacoxae ventrally protuberant. Six species are now included in this group, and the males of these species can be separated by using the following key:

1 Antennomere X distinctly transverse..................................................................... 2

- Antennomere X longer than wider or at least as long as wide................................................... 3

2 Antennomeres IX and X obliquely conjoined (Yin & Li 2012: 89, Fig 3 A); aedeagus with slender parameres (Yin & Li 2012: 89, Figs 3 J–L)...................................................................... L. dabashanus Yin & Li

- Antennomeres IX and X conjoined at middle (Yin et al. 2013b: 349, Fig. 16); aedeagus with broad parameres (Yin et al. 2013b: 349, Figs 24–26)......................................................... L. jiudingensis Yin & Nomura

3 Lateral expansion of postgenae weakly developed, excavation small ( Fig. 3 C); apical portion of mesotibiae slightly concave at mesal margin ( Fig. 3 C)..................................................................... L. reitteri Sharp

- Lateral expansion of postgenae strongly developed, with large excavation; apical portion of mesotibiae not concave at mesal margin............................................................................................. 4

4 Antennomeres IX and X strongly modified, IX with acute anterolateral angle (Yin & Li 2012: 97, Fig 8 A); pronotal disc smooth (Yin & Li 2012: 94, Fig 6 B)...................................................... L. schuelkei Yin & Li

- Antennomeres IX and X enlarged but not modified; pronotal disc roughly granulated................................ 5

5 Antennomere IX as wide as X (Yin et al. 2013a: 34, Fig. 6 A)................... L. sichuanicus Hlaváč, Nomura & Zhou

- Antennomeres IX distinctly broader than X ( Sawada 1961: Fig. 9)................................ L. shibatai Sawada Distribution. This species is known from Honshu (Fukushima, Gunma, Ibaraki, Kanagawa, Nagano, Tochigi), Japan.

Figures

FIGURE 3. Labomimus reitteri (A, B. Female. C – J. Male). A. Dorsal habitus of the female holotype. B. Labels of the holotype. C. Dorsal habitus of the male. D. Antennal club. E. Metaventral process. F. Protrochanter and profemur. G. Mesotrochanter and mesofemur. H. Metacoxa. I. Aedeagus, in dorsal view. J. Same, in lateral view. Scales: A, C = 1.0 mm; H, I, J = 0.2 mm; D, E, F, G = 0.3 mm.

FIGURE 6. Lectotype of Pselaphodes spinosus, male. A. Dorsal habitus. B. Labels of the lectotype. C. Antennal club. D. Metaventral process. E. Protrochanter and profemur. F. Mesotrochanter and mesofemur. G. Aedeagus, in dorsal view. H. Same, in lateral view. Scales: A = 1.0 mm; C – F = 0.3 mm; G, H = 0.2 mm.

FIGURE 8. Lectotype of Pselaphodes villosus, female. A. Dorsal habitus. B. Labels of the lectotype. C. Head. D. Pronotum. E. Maxillary palpus. F. Elytra. G. Abdominal tergites IV – VII. H. Abdominal sternites III – VII. Scales: A = 1.0 mm; G, H = 0.5 mm; C – F = 0.2 mm; E = 0.1 mm.