Pseudoleiobunum, Suzuki & Ohrui, 1972

Tan, Desmond Kai Teck, Tsurusaki, Nobuo, Fong, Jonathan J. & Zhang, Chao, 2025, Reinstatement of the genus Pseudoleiobunum Müller, 1914 with the inclusion of a new species from Hong Kong and reallocation of the Leiobunum maximum species complex (Arachnida: Opiliones: Eupnoi: Sclerosomatidae), Zootaxa 5646 (3), pp. 301-343 : 306

Pseudoleiobunum (superspecies maximum ) japanense japanense Müller, 1914

Pseudoliobunum japanense Müller, 1914: 95 ; Roewer, 1923: 923–924.

Pseudoleiobunum japanense Suzuki, 1972: 47–48 , Figure 3 .

Leiobunum japanense japanense : Suzuki, 1976: 199–200; Tsurusaki & Sasaji, 1991: 11, Figures 5A–B ; Kato et al., 2023: 63.

Materials examined. ( PREF. = Prefecture; Mt. = Mount; juv. = juvenile) JAPAN, SAITAMA PREF.: Chichibu City, Otaki-mura, Irikawa , Chichibu Experiment Forest of the University of Tokyo, 1♂ 26 July 1998, M. Imai. — JAPAN, CHIBA PREF.: Ichihara City , Umegase Gorge , 1♂, 26 March 2007, M. Watanabe. — JAPAN, JAPAN, KANAGAWA PREF.: Yokohama City , Kanazawa-ku , Kamariya-cho, E. valley of Mt. Daimaru , 1♂, 25 June 1994, Y. Goto. Sagamihara City, Shimomizo , 1♀, 25 May 1997, M. Imai. — JAPAN, FUKUI PREF.: Ohno City , Rokuroshi , 1♂, 4 August 1990, H. Sasaji. — JAPAN, NAGANO PREF.: Omachi City , Omachi Dam , 910 m, 1♀, 1 June 1994, W. Miyata; Kami-Ina-gun, Minami-Minowa-mura, Mt. Kyogadak , S. ( Mt. Kitazawa ), 1380 m, 2 juv., 14 May 1983, Y. Nishikawa. — JAPAN, SHIZUOKA PREF.: Fujinomiya City, Shiraito-no-taki Falls, 2♂, 11 July 1993, K. Ishii; Ito City, Lake Ippeki , 1♀, 27 May 1993, M. Ohrui; Izu-Amagi, Hacchoike, 1100 m, 3 juv., 8 October 1984, M. Ohrui; Amagi-toge Pass, Himuro, 750 m, 1 juv., 22 April 1985, M. Ohrui; Tabawa-gun, Amagi-Yugashima-cho, Himuroenchi, 700m: 1♀, 8 July 1989, M. Ohrui; 1♀, 22 July 1992, M. Ohrui; 1♀, 27 July 1992, M. Ohrui .

Distribution. The central and eastern parts of Japan (Kanto and Chubu Districts) ( Fig. 12).

Habitat. This species is univoltine and overwinters as juveniles.Adults can be found from March to early August. They can be found under logs, stones on wet forest ground and walls of wet cliffs along mountain streams.

Description. Ocularium low, supracheliceral lamellae well-developed and generally pointy, often armed with black-tipped granules ( Suzuki 1973: figs 1, 120; Suzuki 1976: figs 128–132, 143, 156). Male labrum mushroom-shaped or slender ( Suzuki 1976: figs 1–2, 4–5, 6, 9–13; Tsurusaki 1985: fig. 3A), without lateral denticles or armaments. Coxae I–IV armed with a marginal row of small tubercles anteriorly and posteriorly. Leg femora can be finely armed with minute, knob-like granules. Such granules may resemble pseudoarticulations, but they are smaller.

Figures

FIGURE 3. Pseudoleiobunum lutulentum sp. nov., male (LINGU-INV154), body. A Dorsal view. B Ventral view. Scale bars: 1 mm.

FIGURE 5. Pseudoleiobunum lutulentum sp. nov., close-up comparisons of femora II under light microscope and scanning electron microscope of leg surface, revealing the granules that are present in the legs of P. lutulentum sp. nov. A Light microscopy of leg II femur, LINGU-INV72. B Light microscopy of leg II femur, LINGU-INV106. C Scanning electron microscopy of the surface of leg II femur, LINGU-INV115. D Close-up of the granules on leg surface, LINGU-INV116. Scale bars: 100 μm for C; 20 μm for D.