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Volume 37 (1988 - 198･･･
- Issue 2 Pages 51-
- Issue 1 Pages 1-
Volume 37, Issue 1
Displaying 1-6 of 6 articles from this issue
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Akira SHINKAI, Eiichi SHINKAI1988 Volume 37 Issue 1 Pages 1-12
Published: 1988
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSWeb structure of Conoculus lyugadinus was observed. These webs occurred above the surface of streams, and two types of webs were distinguished. One was a horizontal orb-web with some suspension threads above the web. The other was basically a horizontal orb-web, but the sticky spirals were hung down and reach onto the water suface. In this modified orb-web, the attachment of the sticky spiral on the water surface had many fine threads.
After spinning the sticky spirals, the spider broke every radius part between the hub and the inner loop of sticky spirals, and extended every radius toward the periphery of web. As the radii were reluxed, distal parts of the sticky spirals of the modified orb-web were floating on the stream. These modified orb-webs are therefore “floating web”.
The type of web tends to be changed by environmental factors of the web site. The floating webs were seen in the lower part above the water surface. On the other hand, the true horizontal orb-webs were seen in the higher part above the water surface or above dried streams.
These observations suggest that Conoculus lyugadinus was derived from an orb-weaving ancestor, and adapted to the aquatic environment.View full abstractDownload PDF (1397K) -
Kenji KAIHOTSU1988 Volume 37 Issue 1 Pages 13-22
Published: 1988
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSThe life history of Cyspius orientalis YAGINUMA was studied during 4 years both in the laboratory and in the field. Mating was done suddenly without any premating behavior. The female laid eggs only once in a year. She made a lentil-shaped egg-cocoon and carried it with her spinnerets. She extended silk threads irregularly between stones in a small area, in which she protected the egg-cocoon for about a month. Then the spiderlings escaped from the egg-cocoon and clustered on the surface of the empty cocoon for a few days, during which the cocoon was still attached to their mother's spinnerets.
All the individuals matured at the 9th instar. They passed through the first winter as juveniles and the second as adults. Some adult females survived other individuals till the fourth year. The population studied has a 2-3.5 year life cycle.View full abstractDownload PDF (2296K) -
Max VACHON, Takuya ABE1988 Volume 37 Issue 1 Pages 23-32
Published: 1988
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSThe Krakatau Islands, located between Java and Sumatra, consist of 4 islands which were sterilized by the volcanic eruption of Krakatau in 1883. 1982, three species of scorpions were collected in the islands. Two of these species had been previously recorded from the islands; Chaerilus variegatus nigricolor in 1908 and 1933, and Lychas mucronatus in 1933, but the other species Liocheles australasiae was newly recorded, The number of species of scorpions in the Krakatau Islands has thus continued to increase slowly: 1 in 1908, 2 in 1933 and 3 in 1982.View full abstractDownload PDF (999K) -
Yoshinari ENAMI, Jun-ichi AOKI1988 Volume 37 Issue 1 Pages 33-36
Published: 1988
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSA new oribatid mite of the family Damaeidae is described from Japan under the name of Tectodamaeus striatus. It is related to T. armatusAOKI, 1984, but is distinguished from the latter mainly by the presence of the spinae adnatae and the striation in the anterior part of notogaster.View full abstractDownload PDF (258K) -
Diplopoda: Polydesmida: XystodesmidaeTsutomu TANABE1988 Volume 37 Issue 1 Pages 37-45
Published: 1988
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSTwo new species of Japanese Xystodesmidae, Riukiaria anachoreta n. sp. (southern Kyûshû) and R. puella n. sp. (Is. Yaku-shima), are described and figured based on male and female adults.View full abstractDownload PDF (800K) -
Hiroshi ABE1988 Volume 37 Issue 1 Pages 47
Published: 1988
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESS
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