Acta Arachnologica

Original Articles

Two new species of Liphistius (Araneae: Liphistiidae) from Thailand

Akio Tanikawa, Booppa Petcharad

2023 Volume 72 Issue 1 Pages 1-8
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.1

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Two new species of Liphistius, L. pilok n. sp. and L. chang n. sp., are described from Thong Pha Phum District, Kanchanaburi Province, Thailand.

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A new species of the genus Neon (Araneae: Salticidae) from Japan

Tatsumi Suguro

2023 Volume 72 Issue 1 Pages 9-11
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.9

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A new species of the genus Neon Simon 1876 is described as Neon ferrugineus sp. nov. from Japan. The new species can be distinguished from congeners by the embolus with expanded and bifurcate apex. Female of this species is hardly discriminable from that of N. kiyotoi Ikeda 1995.

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The first description of the adult female of Araneus yoshitomii (Araneae: Araneidae)

Akio Tanikaw

2023 Volume 72 Issue 1 Pages 13-16
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.13

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Adult female of Araneus yoshitomii Yoshida 2014 has been described for the first time. The conspecific pair of male and female specimens was confirmed by DNA barcoding using mt-COI partial sequencing data.

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A new synonymy of Coelotes oshimaensis Shimojana 2000 (Araneae: Agelenidae: Coelotinae) in Japan

Ken-ichi Okumura, Ren-Chung Cheng

2023 Volume 72 Issue 1 Pages 17-21
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.17

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A new synonymy of coelotine spider is proposed through a comparison of the morphological characteristics and the results of our molecular analysis. Coelotes hachijoensis Ono 2008, described on the basis of specimens from Hachijo Island, is a junior synonym of Coelotes oshimaensis Shimojana 2000. The original distribution of C. oshimaensis is considered to be on Amami-oshima Island and the Tokara Islands in southwestern Japan, far from Hachijo Island. Various circumstantial evidences suggested that C. oshimaensis on Hachijo Island may have been artificially introduced from Amami-oshima Island.

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A new spider species of the genus Systaria Simon 1897 (Araneae: Clubionidae) from central Vietnam

Quang Duy Hoang

2023 Volume 72 Issue 1 Pages 23-27
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.23

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A new spider species Systaria minhnguyeni sp. n. (♂ ♀) is described here, and the genus Systaria Simon 1897 is recorded for the first time in Vietnam. Detailed descriptions, photographs of copulatory organs, and somatic features are also provided.

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Taxonomic notes on Dolomedes nigrimaculatus (Araneae: Pisauridae) from Korea

Junho Chae, Jun-Gi Lee, Jun-Ho Lee, Sam-Kyu Kim

2023 Volume 72 Issue 1 Pages 29-37
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.29

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A poorly known nursery web spider species, Dolomedes nigrimaculatus (Araneae: Pisauridae), is redescribed on the basis of Korean specimens, with a new junior synonym, Dolomedes jirisanensis which has been treated wrongly as a nomen nudum. Dolomedes nigrimaculatus is considered a sister species of D. zatsun from Okinawa Island, Japan, which have several morphological characteristics in common. Detailed description and remarks on the synonymy and intraspecific variation in its body coloration and shape of copulatory organs of D. nigrimaculatus are provided, with a key to all Korean Dolomedes species.

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Some Cyrtophora spp. (Araneae: Araneidae) build silk stabilimenta

Alexander M. Kerr

2023 Volume 72 Issue 1 Pages 39-48
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.39

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Spiders in the genus Cyrtophora Simon, 1864 often incorporate debris and egg sacs in their webs. Based on a survey of online digital imagery, I report here that at least three species in this genus also include silk decorations: C. cylindroides (Walckenaer 1841), C. ikomosanensis (Bösenberg & Strand 1906), and C. moluccensis (Doleschall 1857). These species lay single to multiple zigzagging silk strips in an arcuate, looping, or spiral pattern often centred about the web’s hub. However, small juveniles and males installed scattered floc-like silk in the barrier strands below the web. The most commonly observed decorator, C. moluccensis, displayed the devices in only 13.9% of observed webs (n = 465), lower than most other silk-decorating spiders. The discovery of novel spider behaviour and web structure is considerably aided by online databases of natural-history observations.

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Redescription of a poorly known troglophile spider, Meta manchurica Marusik & Koponen 1992 (Aranei: Tetragnathidae)

Alexander A. Fomichev, Mikhail M. Omelko

2023 Volume 72 Issue 1 Pages 49-53
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.49

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A poorly known troglophile spider species of the genus Meta C. L. Koch 1835 (Tetragnathidae) from the Russian Far East is redescribed based on newly collected material.

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A new species of Larinia (Araneae: Araneidae) discovered in rice fields in Thailand

Akio Tanikawa, Tanakorn Into, Booppa Petcharad

2023 Volume 72 Issue 1 Pages 55-58
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.55

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A new species of Larinia, Larinia phosop n. sp., is described on both sexes from Thailand.

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The first record of the spider genus Coreodrassus Paik 1984 (Araneae: Gnaphosidae) for Mongolia with description of a new species

Ochirkhuyag Jargalsaikhan, Alexander A. Fomichev, Jugdernamjil Nergui

2023 Volume 72 Issue 1 Pages 59-62
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.59

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A new species of ground spider, Coreodrassus boldgivi sp. nov., is diagnosed, illustrated and described based on a male specimen. The genus Coreodrassus itself is also recorded for Mongolia for the first time. The holotype was found in a woodland habitat within the semi-desert zone in Dornogovi Aimag, southeastern Mongolia. The new species is related to C. lancearius (Simon 1893) and differs from it by the shape of the male palp.

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Distribution boundaries of two subspecies of the harvestman Leiobunum japanense in central Japan

Takanori Kato, Tomoko Okamoto, Koji Tsuchida

2023 Volume 72 Issue 1 Pages 63-70
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.63

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Leiobunum japanense (Müller 1914) is a species of harvestman endemic to Japan, which is divided into two subspecies based on the external morphology of apophyses on trochanters of legs and palpi: L. japanense japanense (Müller 1914) and L. japanense japonicum (Suzuki 1940). Their distributional boundaries had remained unclear due to the lack of collection records. Therefore, we investigated the distribution of these subspecies through field research and compared their morphological characters. Field sampling revealed that L. j. japanense is distributed in the eastern and central Gifu Prefecture, whereas L. j. japonicum is distributed in a narrow region in the westernmost part of Gifu Prefecture. At the two sampling sites where the two subspecies meet, individuals with characteristics resembling one of the two subspecies-like were dominant on either bank of a river, suggesting that the river might have separated the two subspecies, though specimens showing intermediate conditions were also found in a population.

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Obituary

[title in Japanese]

[in Japanese]

2023 Volume 72 Issue 1 Pages 73-76
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.73

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Supplementary material

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[title in Japanese]

[in Japanese]

2023 Volume 72 Issue 1 Pages 77-79
Published: June 20, 2023
Released on J-STAGE: July 01, 2023

DOIhttps://doi.org/10.2476/asjaa.72.77

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