Acta Arachnologica

Original Articles

Arctosa cervina (Araneae: Lycosidae) removed from the synonymy with A. subamylacea and newly recorded in Japan

Tanikawa Akio

2022 年 71 巻 2 号 p. 73-75
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.73

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Arctosa cervina is removed from a junior synonym of Arctosa subamylacea, because it can be distinguished by the morphology of the epigyne and palpal organ. Arctosa cervina is newly recorded in Japan by the specimens collected in Saitama and Yamanashi Prefectures.

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A newly recorded species from Japan, Venonia spirocysta (Araneae: Lycosidae)

Kamura Takahide

2022 年 71 巻 2 号 p. 77-79
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.77

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A species of the family Lycosidae, Venonia spirocysta Chai 1991, is reported from Japan for the first time. The specimens of the species were collected from Tarama-jima Island, Okinawa Prefecture. The genus Venonia is also newly recorded from Japan, but since the generic placement of V. spirocysta is problematic, this species may be transferred to another genus in the future.

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A new species of jumping spider of the genus Ceriomura Simon 1901 (Araneae: Salticidae: Gophoini) from the Colombian Caribbean

Leiner A. Suarez-Martinez, María Florencia Nadal, Edwin Bedoya-Roqueme ...

2022 年 71 巻 2 号 p. 81-88
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.81

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A new salticid species of the genus Ceriomura Simon 1901 is described herein as C. momilensis n. sp. found in the dry forest of the Córdoba department in northwestern Colombia. Photographs and illustrations of the diagnostic characters for both males and females and ecological comments are provided. In addition, a distribution map, and a key with all species of the genus Ceriomura are included.

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New records of Tapinocyba subula (Araneae: Linyphiidae) in Japan

Norifumi Ohchi

2022 年 71 巻 2 号 p. 89-91
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.89

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Tapinocyba subula Seo 2018 is newly recorded in Japan. This species was described on the basis of the specimens collected in Korea. Specimens collected at several sites in Fukuoka Prefecture, Japan, were identified as T. subula. This species was redescribed in Japan.

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Taxonomic revision of six species of the subfamily Coelotinae (Araneae: Agelenidae) from Japan accompanied with the description of Nesiocoelotes gen. n.

Ken-ichi Okumura, Zhe Zhao

2022 年 71 巻 2 号 p. 93-103
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.93

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Morphological and phylogenetic analyses have shown that five species of coelotine spiders that inhabit East China Sea islands, previously classified into the genus Coelotes, are distinct from all the other known genera. Therefore, a new genus, Nesiocoelotes is established to accommodate these species and the classification of the corresponding species is revised. Each species of the new genus is characterized by having two retromarginal teeth on chelicerae, large patellar apophysis on the male palp, epigynal teeth close together, protruding from the center of the anterior margin of the epigyne. Phylogenetic analyses support the monophily of the genus and its early divergence from other coelotine lineages. Geographic variation is observed in specimens collected from the Goto Islands. In addition, the genetic analysis of Coelotes iheyaensis Shimojana 2000, which is known to resemble the genus Griseidraconarius Okumura 2020 in morphological characteristics, was performed. As a result, it became clear that C. iheyaensis inhabiting the Okinawa Islands belongs to the genus Griseidraconarius. Therefore, the systematic position of this species is also revised.

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The behavioral and external morphological observations on oviposition and postembryonic development in Galeodes hakkariensis Erdek 2021 (Solifugae: Galeodidae)

Melek Erdek

2022 年 71 巻 2 号 p. 105-113
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.105

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Oviposition was observed in Galeodes hakkariensis Erdek 2021. Part of the developmental changes post-hatch were recorded, and the cuticular surfaces of egg and first post-embryos were surveyed with a scanning electron microscope. This species has oval-shaped eggs varying from 2 mm to 4 mm in diameter. The fine structure of the external morphology of post embryos in a solifuge is shown for the first time. The cuticular patterns and sensilla on opisthosoma and tarsal sensilla on each pedipalp and leg were described in post-embryos. The surface of each opisthosomal basiconic sensilla without the socket is covered with pores, likely functioning as chemoreceptors. Tarsal basiconic sensilla not in a socket and without pores on pedipalps and legs likely function as mechanoreceptors. The single slit sensillum on the tarsus of pedipalps functions as mechanoreceptors.

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A new species of the genus Hyleoglomeris Verhoeff 1910 from Central Japan (Diplopoda: Glomerida: Glomeridae)

Mai Kuroda, Mayu Susukida, Katsushi Sakamoto, Sho Tsukamoto, Anh D. Ng ...

2022 年 71 巻 2 号 p. 115-124
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.115

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A large-sized species of Hyleoglomeris collected from Shiga Prefecture, Central Japan, was discriminated from the described species known from Japan and surrounding areas by our careful examination of external body structure as well as male telopods. The new species is similar to H. stuxbergi from Japan, but can be distinguished from the latter by the following combination of characters: syncoxital lobe widely bifid forming two sublobes which are extended ventrolaterad (vs. narrowly bifid forming a pair of sublobes extended ventrad in H. stuxbergi); syncoxital horns slightly converging to each other (vs. almost parallel in H. stuxbergi); femoral trichostele slightly curved mesad (vs. strongly bent laterad in H. stuxbergi). On the base of these differences, the species is herein described as Hyleoglomeris awaumi Kuroda, Susukida & Eguchi, sp. nov. Our COI-based phylogenetic tree involving H. awaumi and other five congeneric Japanese species also shows the genetic distinctiveness of the new species. In addition, our analysis further suggests that Japanese Hyleoglomeris is non-monophyletic.

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First record of host spider amputation by the Japanese spider wasp Cyphononyx fulvognathus (Hymenoptera: Pompilidae: Pepsinae)

Shûhei Yamaguchi, Akira Shimizu, Takeshi Yamasaki, Frank E. Kurczewski ...

2022 年 71 巻 2 号 p. 125-127
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.125

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The behavior of amputating the legs of spider prey by Cyphononyx fulvognathus (Pepsini, Pepsinae, Pompilidae) is reported for the first time. The prey was a female of Heteropoda, presumably H. venatoria (Araneae: Sparassidae), which is also the first prey record of Heteropoda for this wasp species. The present observation was found to be one of the uncommon examples of prey amputation for Pompilidae, which is common in species of Ageniellini (Pepsinae).

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First records of the arboreal wolf spider species Hogna trunca Yin, Bao & Zhang 1996 (Araneae: Lycosidae) from Japan

Rio Shida

2022 年 71 巻 2 号 p. 129-133
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.129

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The arboreal lycosid species, Hogna trunca Yin, Bao & Zhang 1996, is newly recorded from Japan. Hogna trunca was originally described from Zhejiang Province (China) and has been known only from China. The author confirmed its presence in Nara Prefecture and in the northern part of the Okinawa Island in Japan, reporting it as a new record for the country. The genus Hogna is also new to Japan. In both areas, the species was found in forests along streams and was observed waiting on tree bark or hiding in tree hollows mainly at night. Presumably, the species has not been discovered until recently because of its unique arboreal ecology for a spider of the family Lycosidae, which mainly includes ground-dwelling species.

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Generic placements of the Japanese species assigned to the genus Otacilia (Araneae: Phrurolithidae), with a description of a new genus

Takahide Kamura

2022 年 71 巻 2 号 p. 135-140
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.135

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Generic placements of seven Japanese species assigned to the phrurolithid genus Otacilia Thorell 1897 are examined. Four species are transferred to Acrolithus Liu & S. Li in Liu et al. 2022: A. meles (Kamura 2021) n. comb., A. mustela (Kamura 2008) n. comb., A. stella (Kamura 2005) n. comb. and A. vulpes (Kamura 2001) n. comb. A new genus is described under the name of Lunalithus n. gen., and one species is transferred to this genus: L. luna (Kamura 1994) n. comb. One species is transferred to the liocranid genus Paratus Simon 1898: Paratus kamurai (Ono & Ogata 2018) n. comb. Only Otacilia komurai (Yaginuma 1952) remains in the same genus.

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Multiparasitism of water mite larvae (Acari: Hydrachnidiae) on a single midge (Diptera: Chironomidae)

Hiroshi Abé

2022 年 71 巻 2 号 p. 141-146
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.141

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Multiparasitism by different species of larval water mites was observed on an adult midge collected in Hokkaido, northern Japan. Water mite larvae of Hygrobates sp. and Unionicola sp. in an inactive stage were discovered from a single chironomid female in the subfamily Chironominae. Eight Hygrobates larvae parasitized on the dorsum, and four were on the venter from the first to fourth abdominal segments of the midge. One Unionicola larvae attached on the trochanter of the left midleg and one on the femur of the right midleg. Their attachment sites on the midge accorded well with the larval site preferences of these two genera, as reported in past studies. Considering the preference of Unionicola for the specific segments of the legs, the observed site partitioning between Hygrobates and Unionicola seems to have originated by intrinsic site preferences of each taxon rather than interspecific competition. On the other hand, two less-engorged Hygrobates larvae were observed among the fully engorged larvae on the abdominal segments of the midge. Such developmental variations are possibly caused by intraspecific competition for nutrients among conspecific larvae on a single host individual.

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Otacilia tham spec. nov. and O. saszykaska spec. nov. from Laos, the first two cave-dwelling guardstone spiders (Arachnida: Araneae: Phrurolithidae)

Peter Jäger

2022 年 71 巻 2 号 p. 147-155
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.147

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Two new species of the genus Otacilia Thorell 1897 are described from the Vang Vieng Karst in northwestern Laos: O. tham spec. nov., the first species of the entire family that lives in caves and is blind, i.e. has only non-functional remnants of the four lateral eyes, and O. saszykaska spec. nov., a cave-dwelling species with eight eyes, and posterior median eyes strongly reduced in size. A distribution map of E- and SEAsian genera of Phrurolithidae is provided.

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New records of Thanatus vulgaris Simon 1870 (Araneae: Philodromidae) from Japan

Ken-ichi Kumada

2022 年 71 巻 2 号 p. 157-159
発行日: 2022/12/20
公開日: 2022/12/27

DOIhttps://doi.org/10.2476/asjaa.71.157

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Thanatus vulgaris Simon 1870 is newly recorded from Japan. This species was known as a species distributed in Europe, the Far East, Central and East Asia, North America, South Africa and Australia. In East Asia, it was recorded from China and Korea. In Japan, it was collected at a livestock farm and is considered to be anthropogenically distributed, having been brought in with imported feed.

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