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Volume 41 (1992)
- Issue 2 Pages 119-
- Issue 1 Pages 1-
Volume 41, Issue 1
Displaying 1-6 of 6 articles from this issue
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Toshiya MASUMOTO1992 Volume 41 Issue 1 Pages 1-4
Published: 1992
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSA colony of Philoponella raffrayi (SIMON, 1891) was observed in the undergrowth of the secondary forest of the Forest Research Institute of Malaysia in Kuala Lumpur, Malaysia. The communal web was made up of 1) numerous females' orb-webs surrounding the colony, 2) strong sustainable silks which constitute irregular framework of the colony, and 3) irregular webs forming the center of the colony where males dominantly exist. The numbers of adult females, adult males, and juvenile females were 61, 15 and 2, respectively. The distribution of the developmental stages of the individuals in the colony indicates that the spiders have matured simultaneously. Three other species of spiders, Portia sp., Leucauge sp. and Argyrodes sp., were collected in the colony of P. raffrayi.View full abstractDownload PDF (377K) -
Kazuyoshi MIYASHITA1992 Volume 41 Issue 1 Pages 5-10
Published: 1992
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSAdult females of Oecobius annulipes LUCAS collected from April to early September lived for 1-4 months under indoor conditions and produced 1-6 egg-sacs, but those collected after mid September overwintered, and then began to produce egg-sacs in the following spring. Nymphs reared under natural and long (LD-16:8) photoperiods overwintered at the last instar or after attaining adulthood. Upon rearings under a short (LD-10:14) photoperiod, the instar at which they overwintered varied among individuals, but the time of emergence as adults in the follownig spring was about the same as that of individuals reared under natural and long photoperiods. Since adults appear in succession from April to early September and lay egg-sacs, there occurs an excessive generation overlap in the year.View full abstractDownload PDF (485K) -
Akio TANIKAWA1992 Volume 41 Issue 1 Pages 11-85
Published: 1992
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSJapanese spiders of the genus Cyclosa MENGE, 1866, are revised. After an examination of many specimens collected from various parts of Japan, 22 species of the genus occurring in the country were recognized. They are as follows: C. octotuberculata KARSCH, 1879, C. laticauda BÖSENBERG et STRAND, 1906, C. monticola BÖSENBERG et STRAND, 1906, C. angusta sp. nov., C. onoi sp. nov., C. omonaga sp. nov., C. confusa BÖSENBERG et STRAND, 1906, C. japonica BÖSENBERG et STRAND, 1906, C. norihisai sp. nov., C. atrata BÖSENBERG et STRAND, 1906, C. hamulata sp. nov., C. maritima sp. nov., C. psylla (THORELL, 1887), C. mulmeinensis (THORELL, 1887), C. vallata KEYSERLING, 1886, C. sachikoae sp. nov., C. alba sp. nov., C. argenteoalba BÖSENBERG et STRAND, 1906, C. okumae sp. nov., C. ginnaga YAGINUMA, 1959, C. kumadai sp. nov. and C. sedeculata BÖSENBERG et STRAND, 1906.View full abstractDownload PDF (8187K) -
Tsutomu TANABE1992 Volume 41 Issue 1 Pages 87-90
Published: 1992
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSThe karyotypes of males of four xystodesmid millipeds from Japan, Parafontaria circula (ATTEMS), Parafontaria sp., Levizonus montanus (TAKAKUWA) and Riukiaria semicircularis semicircularis (TAKAKUWA), were examined by air dry method. Parafontaria circula, Parafontaria sp. and Levizonus montanus exhibited 2n=12 chromosomes. Riukiaria semicircularis semicircularis showed 2n=16. Parafontaria circula, Parafontaria sp. and Levizonus montanus were similar to one another in the relative lengths of chromosomes.View full abstractDownload PDF (801K) -
Koichi TANAKA1992 Volume 41 Issue 1 Pages 91-101
Published: 1992
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSThe life history of the funnel-web spider Agelena limbata was studied in Nagoya located in the central region of Japan. Agelena limbata has 1-year life cycle. Instar 1 nymphs emerged from egg sacs in late March to early April and underwent six molts to adults. Males and females matured synchronously and reproduced mid to late August. Most webs were constructed on the evergreen trees which were densely covered with small hard leaves, e.g. Eurya japonica, Ligustrum japonicum, and Buxus microphylla. Fertility was positively correlated with female body size, especially body weight before oviposition. Body size and fertility were compared between two habitats, an open area and a woody field. Body size of adults and fertility were significantly smaller in the open habitat than in the woody habitat. Limited prey availability in the open habitat certainly caused the observed smaller adult size and fertility.View full abstractDownload PDF (990K) -
Araneae: SalticidaeTakatoshi MAEKAWA, Hiroyoshi IKEDA1992 Volume 41 Issue 1 Pages 103-108
Published: 1992
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSThe sexual behaviour of a gynandromorphic spider of the salticid species, Carrhotus xanthogramma (LATREILLE, 1819), was observed in laboratory. The individual has a male right palp and a simple left one as in female. The left side of abdomen is expanded and shows the female characteristics with a deformed epigynum, while the right side seems to be a male. This gynandromorphic salticid spider took the antagonistic behaviour to a normal male of the same species, and presented the courtship towards a normal female and inserted the only right palpal organ into the female genitalia at the copulation. However, a normal male presented the courtship behaviour towards the gynandromorph which was motionless under anesthetic by CO2.View full abstractDownload PDF (628K)
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