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Volume 70 (2021)
- Issue 2 Pages 75-
- Issue 1 Pages 1-
Volume 70, Issue 2
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original Articles
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Theo Blick, Danniella Sherwood2021 Volume 70 Issue 2 Pages 75-76
Published: December 27, 2021
Released on J-STAGE: December 30, 2021
JOURNAL FREE ACCESSThe spider species name Pelecopsis montana Seo 2018 (Linyphiidae) is preoccupied and requires a replacement name. We establish herein the necessary replacement nomen, namely: Pelecopsis seoi nom. nov. The homonymy of the recently synonymized genus name Collis Seo 2018 (Linyphiidae) and the possible homonymy of Hahnia montana Seo 2017 (Hahniidae) in the near future are also briefly discussed.View full abstractDownload PDF (652K) -
Mahrad Nassirkhani, Nataly Snegovaya2021 Volume 70 Issue 2 Pages 77-82
Published: December 27, 2021
Released on J-STAGE: December 30, 2021
JOURNAL FREE ACCESSThe species Neobisium (Neobisium) vilcekii Krumpál 1983 is redescribed and illustrated based on the adult specimens collected from Caucasian region of Russia. In addition, a new size range, a new description of the females and some morphological and minor morphometric variations within the species are provided.View full abstractDownload PDF (1661K) -
Stênio Italo Araújo Foerster, Welton Dionisio-da-Silva, Adriana Barbos ...2021 Volume 70 Issue 2 Pages 83-86
Published: December 27, 2021
Released on J-STAGE: December 30, 2021
JOURNAL FREE ACCESSScorpions can adopt different reproductive strategies (e.g., sexual or parthenogenesis) depending on the environmental conditions. In this study, we described the courtship repertoire of the parthenogenetic scorpion Tityus stigmurus, a species with inconspicuous sexual populations distributed throughout northeastern Brazil. Specimens of both sexes (10 males, 10 females) were obtained from field expeditions in three locations in northeastern Brazil and were paired under laboratory conditions in an intrapopulation design. All observations were conducted at night using red light positioned above an experimental arena. From the 10 courtship interactions observed in this study, only one pair successfully completed the reproductive repertoire that included the insemination process. The incomplete interactions were abruptly terminated by the females immediately after deposition of the spermatophore. Overall, the reproductive repertoire of T. stigmurus was similar to that of other scorpions, especially its congeners, possibly because this reproductive behavior emerged at a basal point in the evolution of scorpions. The acquisition of new insights into the reproductive biology of different scorpion species may improve the theoretical background for applications ranging from evolutionary biology to public health strategies.View full abstractDownload PDF (799K) -
Akio Tanikawa, Takeshi Yamasaki, Booppa Petcharad2021 Volume 70 Issue 2 Pages 87-101
Published: December 27, 2021
Released on J-STAGE: December 30, 2021
JOURNAL FREE ACCESSAraneus is a large genus containing many species with various features, and phylogenetic analysis has revealed it to be a polyphyletic group. It has been proposed that nine new genera should be established independently from Araneus. One example is a group that includes Araneus mitificus (Simon 1886) and Araneus praesignis (L. Koch 1872). In this study, we examined specimens from several species that are morphologically similar to them, and confirmed their close relationship by phylogenetic analysis using the data of five genes. All targeted species were united in a monophyletic clade, comprising two groups in detail. The epigynes and male palps of the species in these two groups were clearly distinguishable; therefore, we concluded that they should be recognized as two independent genera. Consequently, we describe two new genera, Aoaraneus n. gen. and Bijoaraneus n. gen. Additionally, previously identified Japanese Araneus mitificus specimens were reexamined and concluded to be misidentified. It is described as a new species under the name Bijoaraneus komachi n. sp. in this study.View full abstractDownload PDF (6247K) -
Alexander M. Kerr, Curt G. Fiedler2021 Volume 70 Issue 2 Pages 103-105
Published: December 27, 2021
Released on J-STAGE: December 30, 2021
JOURNAL FREE ACCESSWe report the first instance of ontogenetic variation in web-decorating behaviour among conspecific populations of a spider. Small juveniles of Argiope appensa frequently spin discoid decorations in the Philippines, but only rarely do so in the Mariana Islands of Micronesia. Because discoid decorations have a defensive function, we suggest that natural selection against their main predators, araneophagic wasps, diverse in the Philippines but poorly represented in the Marianas, may be driving this difference in decoration frequency. Alternatively, because there can be a trade-off between defense through decorating and prey capture success, the cost of discoid decorations may be higher in the Marianas because of differences in prey-community structure.View full abstractDownload PDF (1784K) -
María Florencia Nadal2021 Volume 70 Issue 2 Pages 107-116
Published: December 27, 2021
Released on J-STAGE: December 30, 2021
JOURNAL FREE ACCESSIn this work, Pseudofluda palachiyaxa n. sp. found in Chaco, Argentina, is described and illustrated. In addition, new drawings of the previously described species of the genus Pseudofluda, distribution maps, and a habitat photograph are included.View full abstractDownload PDF (7143K) -
Takahide Kamura2021 Volume 70 Issue 2 Pages 117-130
Published: December 27, 2021
Released on J-STAGE: December 30, 2021
JOURNAL FREE ACCESSThree new genera of the family Phrurolithidae, Pennalithus n. gen., Corealithus n. gen. and Labialithus n. gen., are described, and Pennalithus pennatus (Yaginuma 1967) n. comb., Corealithus coreanus (Paik 1991) n. comb. and Labialithus labialis (Paik 1991) n. comb. are respectively designated as type species. In addition to the above type species, four new combinations are proposed: Pennalithus splendidus (Song & Zheng 1992) n. comb., P. palgongensis (Seo 1988) n. comb., Corealithus subnigerus (Fu, Chen & Zhang 2016) n. comb. and Labialithus lindemanni (Marusik, Omelko & Koponen 2020) n. comb. The above five species of Pennalithus and Corealithus are transferred from Otacilia Thorell 1897, and two species of Labialithus are from Phrurolithus C. L. Koch 1839. A new species, Pennalithus suguroi n. sp., is described, and Phrurolithus pennatoides Seo 2018 is treated as a junior synonym of Pennalithus splendidus.View full abstractDownload PDF (20666K) -
Shojiro Nagayama, Keizo Takasuka2021 Volume 70 Issue 2 Pages 131-132
Published: December 27, 2021
Released on J-STAGE: December 30, 2021
JOURNAL FREE ACCESS
J-STAGE DataPandiculation within spiders has only recently been discovered - the first record of this habit among Protostomia – and it has only been demonstrated in one species (Cyclosa argenteoalba). We report here four further araneoid species i.e. Argiope bruennichi, Cyrtophora ikomosanensis, Trichonephila clavata (all Araneidae), and Nihonhimea japonica (Theridiidae) exhibiting pandiculation in or on their own webs. These records suggest that pandiculation is widely distributed at least among the superfamily Araneoidea, members of which generally construct aerial webs and wait in ambush for a long period.View full abstractDownload PDF (3886K)
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