Solenysa trunciformis Wang, Ono & Tu 2015
Creators: name: Ballarin, Francesco
name: Liao, Hauchuan
name: Touyama, Zento
name: Eguchi, Katsuyuki
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Solenysa
Solenysa trunciformis

description: Solenysa trunciformis Wang, Ono & Tu, 2015
Figs 8 A-J, 11 E, F
Solenysa mellotteei: Tu and Li 2006: 91, figs 21–30 (♂ ♀, misidentified per Wang et al. 2015: 54); Tu and Hormiga 2011: 499, figs 7 B, 11 H (♂ ♀, misidentified per Wang et al. 2015: 54).
S. trunciformis Wang et al., 2015: 54, figs 1 A – D, 3 B, 5 E, F (♂ ♀).
Material examined.
Japan: Shikoku Is., Tokushima Pref., • 3 ♂, 7 ♀, Myozai District, Kamiyama Town, Ano, Nashinoki-Toge pass, 11. Oct. 1999, 33.91391°N, 134.28702°E, H. Bando leg. (TKPM) • 2 ♂, 3 ♀, Mima City, Tsurugi Town, Ichu, Tachinomoto, 33.94936°N, 134.06863°E, 1. Jan. 2010, H. Bando leg. (TKPM) • 1 ♂, 5 ♀ (identified as S. reflexilis in Bando 2015), Anan City, Kamo Town, Omatsu-daigongen, 33.91466°N, 134.55208°E, 29. Aug. 2013, H. Bando leg. (TKPM) • 1 ♀ (identified as S. reflexilis in Bando 2015), Anan City, Tsubachi Town, Toyono, 33.82427°N, 134.64894°E, 23. Sep. 2013, H. Bando leg. (TKPM) • 1 ♂, 1 ♀, Anan City, Asebi Town, Arita, along road n ° 28, 33.87834°N, 134.55234°E, in the litter in a forest of sugi trees (Cryptomeria japonica), 15. May. 2019, F. Ballarin, T. and Yamasaki leg. (FBPC) • 1 ♂, 7 ♀, Tokushima City, Kamihachiman Town, Tatsumiyama, 34.01891°N, 134.51008°E, 18. Sep. 2024, Y. Suzuki leg. (TKPM) • Kochi Pref., 1 ♀, Muroto Peninsula, Motootsu, 243 m, 33.31339°N, 134.12262°E, deciduous forest leaf litter, 01. Mar. 2022, F. Ballarin leg. (FBPC) • 1 ♂, Tosa City, Usachoryu, 33.42255°N, 133.45036°E, 15. Sep. 2023, Y. Tsuji leg. (TKPM) • 1 ♂, Shimanto City, Gudo, 32.99045°N, 132.91411°E, 12. Jul. 2023, Y. Tsuji leg. (TKPM) • Okayama Pref., 1 ♂, Maniwa City, Shimoazae, near the entrance of Suwa-do cave (諏訪洞), 183 m, 34.97021°N, 133.62441°E, in the leaf litter of a deciduous forest 20. Apr. 2019, F. Ballarin and T. Yamasaki leg. (FBPC) • 1 ♂, 1 ♀, Niimi City, Toyonagauyama, Safushi river’s valley (佐伏川), 254 m, 34.93934°N, 133.56580°E, in the litter of a deciduous forest on a very steep slope, 21. Apr. 2019, F. Ballarin and T. Yamasaki leg. (MNHAH) • 1 ♀, Takahashi City, Kawakami Town, Kōyamaichi, Anatoyama Shrine (穴門山神社), 454 m, 34.74384°N, 133.39246°E, under stones near the shrine, 22. Apr. 2019, F. Ballarin and T. Yamasaki leg. (FBPC).
Diagnosis.
See Wang et al. (2015).
Description.
Habitus of male as in Fig. 8 E, habitus of female as in Fig. 8 F. Palp as in Fig. 8 A-D, embolic division as in Fig. 11 E, F; epigyne and vulva as in Fig. 8 G-J. See Wang et al. (2015) for a detailed description.
Type locality.
Tondazaka, Shirahama City, Wakayama Prefecture, Honshu, Japan (33.625°N, 135.422°E).
Remarks.
The current distribution of this species covers Shikoku (Tokushima, Kanagawa, and Kochi Pref.), eastern Chugoku (Okayama Pref.), and southern Kansai (Wakayama Pref.), Japan (Shinkai et al. 2024, this work; Fig. 13). The male specimens from Okayama collected by us exhibits a massive and more squared median protrusion (MP) of the MTA together with a much shorter and triangular posterior protrusion (PP) when compared with the holotype (cf. Fig. 11 E, F vs Wang et al. 2015: fig. 6 F). The male from eastern Shikoku examined by us exhibits both the median (MP) and posterior (PP) protrusions strongly reduced. In all cases, the shape of the lamella remains constant. Due to the lack of specimens examined from the type locality area we cannot confirm if this is part of the intraspecific variability of the species or if S. trunciformis is a potential complex of multiple morphologically similar species. Yet, our preliminary molecular results suggest little genetic difference among the individual from Tokushima Pref. with the putative S. trunciformis from Shikoku harvested from GenBank (Fig. 12). Further investigations involving a molecular analysis of a larger number of individuals from different localities may help shed light on this matter.
description: Published as part of Ballarin, Francesco, Liao, Hauchuan, Touyama, Zento & Eguchi, Katsuyuki, 2025, Review of the spider genus Solenysa Simon, 1894 in Western Japan and Central Ryukyu with the description of three new species (Araneae, Linyphiidae), pp. 97-130 in ZooKeys 1232 on pages 97-130, DOI: 10.3897/zookeys.1232.142629