Acta Arachnologica 70表紙3mm

Acta Arachnologica, 70 (1): 29–32, June 28, 2021

A new species of the genus Otacilia (Araneae: Phrurolithidae) from Shikoku and Awaji-shima Is., Japan

Takahide Kamura

1–1–527, Chiyoda-cho, Takatsuki-shi, Osaka 569–0087 Japan E-mail: [email protected]

Abstract ― A new species is described from Shikoku and Awaji-shima Is., Japan under the name of Otacilia meles. This species is similar to O. stella Kamura 2005, but is distinguished from the latter by the male palpal bulb lacking an apophysis on the prolateral side and the longer spermathecae in the female genitalia.

Key words ― taxonomy, Otacilia meles, Kagawa Pref., Hyogo Pref., Ehime Pref.

lows: ALE, anterior lateral eye; AME, anterior median eye; d, Introduction dorsal; MOA, median ocular area; pl, prolateral; PLE, poste- The genus Otacilia of the family Phrurolithidae was es- rior lateral eye; PME, posterior median eye; pv, proventral; tablished by Thorell in 1897 by use of a single species from rv, retroventral. The eye size means the length of long axis Burma (Myanmar). Since the original description there was of an eye, but the measurement of the posterior median eye no study on this genus for more than 100 years until Deele- was made at horizontal level. All measurements are given in man-Reinhold redescribed this genus in 2001; in this work, mm. it was shown that the genus is known mainly from Southeast Taxonomy Asia except two Japanese species, Otacilia lynx (Kamura 1994) and O. luna (Kamura 1994), from Iriomote-jima Is., Otacilia meles n. sp. and two unidentified species from Hong Kong and China. [Japanese name: Mujina-urashimagumo] Thereafter taxonomic studies on this genus began in Japan (Figs. 1–2) and China (for example, Kamura 2005, 2008; Zhang et al. 2009; Fu et al. 2010, etc.), and recently many new species Phrurolithus sp.: Ono & Ogata 2018, p. 576, fig. 690 (1–2). have been described from China. Furthermore, Zamani & Marusik (2020) pointed out that the male palpal basic con- Type series. Holotype: ♂, Aikuri-touge, Kaminishi- formation in many species of the genus Phrurolithus C. L. kou, Shionoe-cho, Takamatsu-shi, Kagawa Pref., Japan, Koch 1839 is different from that of P. festivus (C. L. Koch 26.V.2017, K. Ogata leg. Paratypes: 1♂, Mt. Yuzuruha-san, 1835), the type species of the genus, and transferred more Minami-awaji-shi, Awaji-shima Is., Hyogo Pref., Japan, el- than 20 species from Phrurolithus to Otacilia. Consequent- evation 500 m, in litter of forest of Cryptomeria japonica, ly, at this time 115 species are listed under Otacilia; and it 21.V.2006, N. Tsurusaki leg. 1♀, same data as holotype. is the largest genus in Phrurolithidae (World Spider Catalog Other specimens examined. 3♂3♀, Mt. Saragamine, 2021). Ryujin-daira, Kumakōgen-cho, Ehime Pref., Japan, eleva- Up to the present, 11 species of Otacilia are known from tion 1,160 m, forest of Fagus crenata, by sifting of soil lit- Japan (Ono & Ogata 2018, Suguro et al. 2018, Zamani & ter, 13.VI.2008, N. Tsurusaki leg. Marusik 2020). Recently I had an opportunity to examine Diagnosis. This new species resembles Otacilia stella some specimens of this genus collected from Shikoku and Kamura 2005 known from Nansei Islands, Southwest Ja- Awaji-shima Is., Japan, and found that the specimens belong pan in the shape of two retrolateral apophyses on the male to an undescribed species. In the present paper, I describe a palpal tibia: an apophysis situated ventrally is slender and new species by use of these specimens. sharply pointed apically and the other one situated dorsally The type specimens of the new species described in this has a basal part stout and an apical part slender (Fig. 2 A–C; paper will be deposited in the collection of the Department Kamura 2005, figs. 1–3), but these two species are distin- of Zoology, National Museum of Nature and Science, guished from each other by the following points. The male Tsukuba. The abbreviations used in this paper are as fol- palpal bulb of O. meles lacks an apophysis on the prolateral 30 T. Kamura

Table 1. Lengths of legs of Otacilia meles n. sp. (holotype and two paratypes; male holotype/male paratype/female paratype).

Leg Femur Patella Tibia Metatarsus Tarsus Total

I lost /1.78/1.54 lost /0.66/0.58 lost /1.75/1.58 lost /1.45/1.44 lost /0.70/0.72 - /6.34/5.86

II 1.38/1.45/1.30 0.56/0.58/0.50 1.24/1.30/1.22 1.16/1.18/1.16 0.70/0.69/0.72 5.04/5.20/4.90

III 1.14/1.18/1.08 0.50/0.54/0.48 0.90/0.91/0.86 1.10/1.12/1.08 0.64/0.59/0.68 4.28/4.34/4.18

IV 1.70/1.80/1.64 0.54/0.62/0.54 1.46/1.54/1.44 1.72/1.85/1.70 0.88/0.85/0.92 6.30/6.66/6.24

Fig. 1. Otacilia meles n. sp. A, habitus, male holotype; B, same, female paratype. Scale = 1 mm.

side (Fig. 2 A), while in O. stella the bulb has a distinct large based on male holotype and female paratype: Eye sizes: apophysis (Kamura 2005, fig. 1); the female genitalia of O. AME ♂ 0.09, ♀ 0.08; ALE ♂ 0.11, ♀ 0.10; PME ♂ 0.08, ♀ meles have spermathecae longer than those of O. stella (Fig. 0.07; PLE ♂ 0.10, ♀ 0.08. Distances between eyes: AME- 2 E; Kamura 2005, fig. 6). AME ♂ 0.05, ♀ 0.04; AME-ALE ♂0.02, ♀ 0.01; PME- Description. Measurements of body and legs based on PME ♂ 0.10, ♀ 0.07; PME-PLE ♂ 0.05, ♀ 0.05; ALE-PLE holotype and two paratypes (♂ holotype/paratype, ♀ para- ♂ 0.07, ♀ 0.08. MOA anterior width ♂ 0.22, ♀ 0.20; poste- type): Body length ♂ 3.46/3.50, ♀ 4.01. Carapace length rior width ♂ 0.26, ♀ 0.21; length ♂ 0.25, ♀ 0.23. Clypeus ♂ 1.68/1.70, ♀ 1.56; width ♂ 1.44/1.50, ♀ 1.28. Abdomen height ♂ 0.12, ♀ 0.11. length ♂ 1.78/1.80, ♀ 2.45; width ♂ 1.14/1.20, ♀ 1.78. Variation. Body length ♂ 2.56–3.50, ♀ 2.96–4.01. Cara- Lengths of legs as in Table 1. Measurements of eye area pace length ♂ 1.30–1.70, ♀ 1.38–1.56; width ♂ 1.08–1.50,

Fig. 2. Otacilia meles n. sp. (male holotype and female paratype). A, left male palp, ventral view; B, same, retrolateral view; C, tibia of left male palp, dorsal view; D, epigyne, ventral view; E, female internal genitalia, dorsal view. Scale = 0.2 mm.

♀1.18–1.28. Abdomen length ♂ 1.26–1.80, ♀ 1.58–2.45; without distinct projection; tibia with two distinct apophyses width ♂ 0.83–1.20, ♀ 1.00–1.78. on retrolateral side, ventrally situated one slender, dorsally Number of spines on legs. ♂: femora I–IV d 1; femur I pl situated one stout basally and narrow apically; femur with 3 or 4; femur II pl 1, 2 or 3; tibia: I pv 6 or 7, rv 5, 6 or 7; large swelling on ventral side. Epigyne (Fig. 2 D) with a pair tibia II pv 6 or 7, rv 5 or 6; metatarsus I pv 4, rv 4; metatar- of very shallow concavities, and copulatory openings situ- sus II pv 3 or 4, rv 3 or 4. ♀: femora I–IV d 1; femur I pl 3, ated antero-laterally, rather apart from each other. Female 4 or 5; femur II pl 1 or 2; tibia I pv 6 or 7, rv 7; tibia II pv 6 internal genitalia (Fig. 2 E) with spermathecae long, slightly or 7, rv 5 or 6; metatarsus I pv 4 or 5, rv 3 or 4; metatarsus divergent anteriorly, and a pair of soft bursae anteriorly situ- II pv 3 or 4, rv 3. ated. Chelicera with two spines on anterior side (female para- Color. Male: Carapace and chelicerae reddish brown; type has three spines on left chelicera, but it may not be other appendages yellowish to light reddish brown; sternum normal condition); promargin of fang furrow with well sep- yellowish brown; abdomen dark reddish brown dorsally, arated three teeth and retromargin with usually two (rarely with dorso-posterior part yellowish white, light grayish three or four) teeth close to each other. Male abdomen with brown ventrally; spinnerets light reddish brown. Female: dorsal scutum covering almost whole abdomen. Female ab- Carapace and chelicerae light reddish brown; other ap- domen without dorsal scutum. Male palp (Fig. 2 A–C): Em- pendages yellowish to light reddish brown, but femora and bolus relatively short, basally thick, apically narrow; basal proximal two thirds of tibiae of leg I rather darker; sternum part of embolus with minute hump on prolateral side, but yellowish brown; abdomen grayish brown dorsally, with

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