IntroductionThe genus Salticus Latreille 1804 is currently comprised

of 47 species, and most of them are widely distributed from Europe to Asia. The type species of the genus, S. scenicus (Clerck 1757), is common as zebra jumping spiders in Eu-rope and North America. In the history of spider taxonomy, this genus is the one of the oldest genus among salticid genera. Many species that currently belong to 20 or more different genera were placed in Salticus in the 19th century. In current systematics, this group is close to the genera Car-rhotus Thorell 1891, Philaeus Thorell 1869, Phaulostylus Simon 1902, Pignus Wesołowska 2000, and Mogrus Simon 1882, with composing the tribe Salticini Blackwall 1841 (Maddison 2015).

In Japan, any Salticus species have not been recorded until now. However, we identified several specimens as Salticus latidentatus Roewer 1951 in the recent collection from Osaka and Hyogo, and the identity was confirmed by comparison with the holotype. This species is distributed in Mongolia, Russia and China, and recorded in Japan for the first time. We report S. latidentatus as new record in Japan, and redescribe this species on the basis of the holotype and additional Japanese specimens.

Materials and methodsThe holotype of Epiblemum latidens Kulczyński 1895

was loaned from the Museum and Institute of Zoology, Pol-ish Academy of Science, Warsaw (MIZ). Non-type material used in this study was collected in Osaka and Hyogo, Japan. Their morphology was examined with a Nikon SMZ1270

and Nikon ECLIPSE E600. Multi-focused montage images were produced using Helicon Focus ver. 4.2.9 from several series of source images. The source images were obtained by a Canon EOS 60D camera attached to a Nikon SMZ1270 and Nikon ECLIPSE E600. The abbreviations used in this paper are as follows: ALE, anterior lateral eye; PLE, posteri-or lateral eye; PME, posterior median eye; RTA, retrolateral tibial apophysis. All measurements are given in mm.

Genus Salticus Latreille 1804[Japanese name: Zebra-haetorigumo-zoku]

Salticus latidentatus Roewer 1951[Japanese name: Kyokuto-zebra-haetori]

(Figs. 1–3, 5–21)

Epiblemum latidens Kulczyński 1895: 56, pl. 2, f. 22–24. (examined here)

Salticus latidens Simon 1901: 601; Prószyński 1984: 128. (preoccu-pied by S. latidens Doleshall 1859 = Ligurra latidens)

Salticus latidentatus Roewer 1951: 454 (replacement name); Logunov 1992: 57, f. 2a-d; Logunov & Marusik 1999: 27, f. 9; Logunov & Marusik 2001: 198; Prószyński 2017: 15, f. 4R.

Salticus potanini Schenkel 1963: 410, f. 236a–e; Wesołowska 1981a: 79, f. 106–107; Wesołowska 1981b: 155, f. 81–83; Prószyński 1982: 288, f. 43; Tu & Zhu 1986: 94, f. 34–38; Zhang & Zhu 1987: 33, f. 3A–C; Zhang 1987: 254, f. 226.1–4; Zhou & Song 1988: 8, f. 11a–c; Hu & Wu 1989: 383, f. 300.1–7; Chen & Gao 1990: 197, f. 251a–b; Peng et al. 1993: 206, f. 727–734; Song, Zhu & Chen 1999: 558, f. 315F–G, I, 329G; Hu 2001: 413, f. 264.1–4; Song, Zhu & Chen 2001: 458, f. 306A–E.

Type material examined. Holotype ♂ (MIZ), Kułtuk. Label data in Fig. 4.

Acta Arachnologica, 67(2): 81–85, December 31, 2018

Taxonomic note on Salticus latidentatus (Araneae: Salticidae) – a spider species new to the fauna of Japan

Takeshi Yamasaki1*, Tatsumi Suguro2

1Makino Herbarium, Tokyo Metropolitan University, 1–1 Minami-osawa, Hachioji-shi, Tokyo 192–0397 JapanE-mail: k0468874@kadai.jp

2 Keio Yochisha Elementary School, 2–35–1 Ebisu, Shibuya-ku, Tokyo 150–0013 JapanE-mail: t.s.schlegelii@gmail.com

*Corresponding author

Abstract –– Salticus latidentatus Roewer 1951, which is distributed in Mongolia, Russia and China, is re-corded in Japan for the first time. In Japan the distribution is currently confined to Osaka and Hyogo. We rede-scribe S. latidentatus based on the holotype and additional specimens from Japan.

Key words –– taxonomy, jumping spiders, new record, Honshu, East Asia

T. Yamasaki & T. Suguro

Non-type material examined. 2♂1♀, river bank of Yodo River, Hirakata, Osaka, Japan, 11.II.2016, K. Muraka-mi leg; 1♂, Port island, Chuo-ku, Kobe-shi, Hyogo Pref., 20.V.2015, K. Murakami leg.; 2♀, same loc., 28.VI.2015, K. Murakami leg.; 1♂, same loc., 30.VI.2015, K. Murakami leg.; 5♂, Toyosato, Higashi-Yodogawa-ku, Osaka-shi, Osa-ka, 3.I.2001, K. Nojima leg.; 2♀, same loc., 12.VII.2000, K. Nojima leg.

Diagnosis. Male of Salticus latidentatus is distinguishable from the other congeneric species by the broad RTA without tapering. Female can be distinguished from the congeneric females by slit-like copulatory opening and slender sper-matheca inclining steeply against the epigastric furrow in ventral view. Salticus latidentatus is close to S. proszynskii Logunov 1992, but the former can be distinguished from

the latter by the following characters: circular bulb, which is smaller than that of S. proszynskii (cf. fig. 3A in Logunov 1992); broad RTA, which is wider than that of S. proszynskii (cf. fig. 3B in Logunov 1992); in ventral view, spermatheca inclining steeply against epigastric furrow, compared with that of S. proszynskii (cf. figs. 3E–F in Logunov 1992).

Measurements (2♂1♀ from Osaka; measurements of the holotype in parentheses). Carapace length 1.90–2.06 (2.16)/2.10; width 1.33–1.50 (1.70)/1.50. ALE–PLE 0.75–0.78 (0.88)/0.78; PLE–PME 0.36–0.40 (0.45)/0.37. Width of eye row I 0.98–1.03 (1.16)/1.05; II 0.91–0.97 (1.08)/1.00; III 1.01–1.57 (1.23)/1.13. Abdomen length 1.30–1.42 (2.90)/1.70.

Male. Chelicera longer than ALE–PLE (Figs. 1, 11); two prolateral and one retrolateral teeth on venter, with addition-

Figs. 1–10. Salticus latidentatus, holotype male (MIZ). 1, habitus, dorsal view; 2, same, lateral view; 3, same, ventral view; 4, label data; 5, left chelicera, ventral view; 6, right palp, ventral view; 7, same, retrolateral view; 8, same, dorsal view; 9, right palp, ventral view; 10, same, retrolateral view. Scales 1–3: 1 mm; 6–8: 0.2 mm; 4, 9–10: 0.25 mm.

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al tooth-like projection on margin of joint to fang (Figs. 5, 15). Palp: Bulb circular, with seminal duct running from an-terior bulb along inner margin to posterior bulb (Figs. 6–7, 9–10, 12–13, 16–17). Embolus sharply tapering, with broad basis (Figs. 6, 9, 12, 16). Plate-like RTA developed (Figs. 6–10, 12–14, 16–17); in retrolateral view, anteroventral cor-ner of RTA sharp, slightly extending ventrally (Figs. 7, 10, 13, 17).

Female. General morphology except short chelicera al-most same as in male (Fig. 18). Genitalia: Copulatory atrium longitudinally slender (Figs. 19–21); copulatory duct ex-tended posteriorly with curving, connected to longitudinally slender spermatheca, which is inclining steeply against epi-gastric furrow in ventral view; spermatheca accompanying accessory gland proximally (Figs. 20–21).

Distribution. Mongolia, Russia, China, Japan (new re-cord): Osaka, Hyogo.

The records of this species are confined to Osaka and Hyogo prefecture in Japan. Although the habitat in Osaka seems to be natural vegetation on river bank, several spec-imens were collected in reclaimed land within a large port area in Hyogo prefecture. Because of its limited range and artificial habitats within Japan, there is a possibility that the species is not native to Japan. For further discussion, it is important to reveal and monitor the distribution of this spe-cies in Japan.

Remarks. There are a few slight differences in the palpal structures between the holotype and male specimens col-lected in Japan: with the palp in retrolateral view, the ante-rior margin of RTA is concave in the holotype, but weakly convex in Japanese specimens (Figs. 7, 10 vs. Figs. 13, 17); with the palp in dorsal view, the anterior margin of the cym-bium is almost straight in the holotype, but convex in Japa-nese specimens (Figs. 6, 9 vs. Figs. 12, 16). However, these

Figs. 11–17. S. latidentatus, male. 11, habitus, dorsal view; 12, left palp, ventral view; 13, same, retrolateral view; 14, same, dorsal view; 15, left chelicera, ventral view; 16, left palp, ventral view; 17, same, retrolateral view. Scales 11: 1 mm; 12–14: 0.2 mm; 15–17: 0.25 mm.

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differences can be considered to be intraspecific variation because it can be recognized among specimens used in pre-vious works in Mongolia, Russia and China (ex. Logunov 1992; Peng et al. 1993; Song, Zhu & Chen 2001).

Now, Salticus latidentatus includes Salticus potanini Schenkel 1963 as a junior synonym (Logunov & Marusik 2001; World Spider Catalog 2018). However, Logunov & Marusik (2001) doubts the identification as “S. potanini” by Zhou & Song (1988) and Hu & Wu (1989). The spermathe-cae of “S. potanini” in Zhou & Song (1988) and Hu & Wu (1989) are laying along the posterior margin of the epigyne. On the other hand, the females of S. latidentatus including Japanese specimens have the spermathecae inclining steeply against the epigastric furrow. Although we did not review the taxonomic status of “S. potanini” in Zhou & Song (1988) and Hu & Wu (1989) because these specimens were not available in the present study, its identity should be reviewed in the future study.

Acknowledgements

We would like to express our sincere thanks to Mr. Mr. K. Murakami and Mr. K. Nojima for offering the specimens used in this study, to Dr. Wioletta Wawer (MIZ) for loaning the type material, and to two anon-ymous referees for helpful comments on the manuscript.

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Received June 11, 2018 / Accepted August 6, 2018

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