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Volume 73 (2024)
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Original Articles
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Quang Duy Hoang, Ha Minh Thi Tran, Thuy Bich Vu, Thao Thanh Thi Tran2024 Volume 73 Issue 1 Pages 1-3
Published: August 24, 2024
Released on J-STAGE: August 28, 2024
JOURNAL FREE ACCESSThis study presents the first-ever description of the male of Notiocoelotes parvitriangulus Liu, Li & Pham 2010, found in caves in northern Vietnam. The species is exclusively located within cave environments.View full abstractDownload PDF (2862K) -
Akio Tanikawa2024 Volume 73 Issue 1 Pages 5-8
Published: August 24, 2024
Released on J-STAGE: August 28, 2024
JOURNAL FREE ACCESSBoth sexes of a new species of Tmarus Simon 1875, Tmarus okinawanus n. sp., are described from Okinawajima Island, southwest Japan. Additionally, the female of T. makiharai Ono 1988 is described for the first time.View full abstractDownload PDF (5211K) -
Tatsumi Suguro, Mitsuru Moriguchi2024 Volume 73 Issue 1 Pages 9-15
Published: August 24, 2024
Released on J-STAGE: August 28, 2024
JOURNAL FREE ACCESSTwo new species within the genus Euochin Prószyński 2018, collected from the Nansei Islands, Japan, are described as Euochin japonica Suguro sp. nov. and E. yaeyamana Suguro sp. nov. The genus Euochin is newly recorded in Japan. The two new species can be distinguished from their congeners based on the morphology of the retromarginal tooth and the genitalia.View full abstractDownload PDF (8046K) -
Two new species of Arcuphantes (Araneae: Linyphiidae: Micronetinae) from Owase, Kii Peninsula, JapanSoma Ono, Yoh Ihara, Yusuke Sugawara, Takafumi Nakano2024 Volume 73 Issue 1 Pages 17-22
Published: August 24, 2024
Released on J-STAGE: August 28, 2024
JOURNAL FREE ACCESSTwo new linyphiid species, Arcuphantes shiozakii sp. nov. and A. yakiyama sp. nov., from Owase, eastern Kii Peninsula, Japan, are described based on both sexes. Given the fact that the two new species share almost identical mitochondrial cytochrome c oxidase subunit I sequences, they may represent closely related sister species, but nonetheless, they are clearly distinguishable from each other by the genital characters. Additionally, the new species are closely related to A. osugiensis (Oi 1960) and A. yamakawai (Oi 1960), but they are also distinguished by the morphology of genitalia.View full abstractDownload PDF (3169K) -
Hiroshi Abé2024 Volume 73 Issue 1 Pages 23-31
Published: August 24, 2024
Released on J-STAGE: August 28, 2024
JOURNAL FREE ACCESSFaunal investigation of freshwater halacarid mites was carried out on Ishigaki Island in the southern part of the Ryukyus in Japan. The research was executed in five small streams on the island in 2022 and 2023. During the survey, two halacarid species, Limnohalacarus cultellatus and Lobohalacarus weberi were obtained only from a mountain stream rising from Mt. Omoto. The genus Limnohalacarus was reported for the first time from Japan in this study. Based on the present report of the two halacarid species on Ishigaki Island and the former halacarid record from a spring on Miyako Island, the formation history of the distribution of freshwater halacarids in the Southern Ryukyus was presumed. The freshwater halacarids would disperse from the Eurasian continent to these islands when these islands were a part of the western margin of the continent. Afterward, most of the Ryukyus was inundated by the sea. However, some highland areas have probably escaped from sinking into the sea until the present time. Consequently, it is presumed that the current local distribution of freshwater halacarids on Ishigaki and Miyako Islands has been maintained by the relatively highland area that became a refugium.View full abstractDownload PDF (4173K) -
Yuya Suzuki2024 Volume 73 Issue 1 Pages 33-42
Published: August 24, 2024
Released on J-STAGE: August 28, 2024
JOURNAL FREE ACCESS
J-STAGE DataThe unique foraging ecology of the synotaxid spider Tekellina sadamotoi, including its natural diet and predatory behavior, is described based on field observations and laboratory experiments. Three-year field observations revealed that the natural diet of T. sadamotoi primarily consisted of a psocodea species, Paracaecilius japanus, which accounted for 98% of the prey items. In the field, the spider’s behaviour during prey capture was characterized by the absence of wrapping silks, and the biting site being the mouthparts of the prey. There was no significant positive correlation between prey and predator sizes, as even small juveniles were capable of consuming large prey. Laboratory experiments revealed that the predatory sequences of T. sadamotoi consisted of four behavioral elements: pre-strike, strike, lifting, and consumption. During the initial bite at the strike, the spider targeted various parts of the prey, including the dorsum of the prey’s thorax, forewings, or abdomen, later relocating the biting site to the prey’s mouthparts during consumption phase. The use of silk wrapping was not observed during predatory sequences, as suggested by the field observations. The study further discusses the relationship between the unique foraging ecology of T. sadamotoi and the unusual spinneret morphology of the genus, proposing implications for psocoptera specialist, which had not been detected among spiders before.View full abstractDownload PDF (9178K) -
A new species of the genus Cheiracanthium (Araneae: Cheiracanthiidae) from the Nansei Islands, JapanYuki G. Baba, Akio Tanikawa2024 Volume 73 Issue 1 Pages 43-47
Published: August 24, 2024
Released on J-STAGE: August 28, 2024
JOURNAL FREE ACCESSA new species of the genus Cheiracanthium C. L. Koch 1839, Cheiracanthium minutum sp. nov. (♂♀), is described on the basis of specimens collected from the Nansei Islands, Japan. The photos of the habitus, copulatory organs and illustrations are provided. In addition, the DNA barcode sequence of this species is also provided.View full abstractDownload PDF (3713K) -
Jun-Gi Lee, Yuya Suzuki, Jun-Ho Lee, Chang-Hwan Bae, Sam-Kyu Kim2024 Volume 73 Issue 1 Pages 49-62
Published: August 24, 2024
Released on J-STAGE: August 28, 2024
JOURNAL FREE ACCESSThree species of minute-sized spiders were discovered for the first time in Korea: Theridiosoma fulvum (Theridiosomatidae), Microdipoena ogatai and M. shenyang (Mysmenidae). Previously, T. fulvum and M. ogatai were known to be distributed only in Japan, while M. shenyang was known only in Northeast China. All former records of Microdipoena jobi from Korea are misidentifications of M. shenyang. Detailed descriptions and photographs of the three species are provided.View full abstractDownload PDF (42511K) -
Sangeeta Das, Jatin Kalita, Nilutpal Mahanta, Dulur Brahma, Paris Basu ...2024 Volume 73 Issue 1 Pages 63-66
Published: August 24, 2024
Released on J-STAGE: August 28, 2024
JOURNAL FREE ACCESSThe bird dung crab spider Phrynarachne decipiens (Forbes 1884) is redescribed based on female specimens collected from Assam, India. Photographs and illustrations of the female genitalia are provided. This is the first record of P. decipiens from India.View full abstractDownload PDF (6951K)
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