Sonneratia caseolaris commonly known as mangrove apple or Berembang in the Malay language, is a species of plant in the family Lythraceae. Area of S. caseolaris along Selangor River in Kampung Kuantan has become a natural habitat for a variety of arthropods. This study aimed to identify the species variations in arthropod communities at different selected stations along Selangor River at two different sampling times. Present study was conducted for six consecutive months (August 2010 until January 2011) at 19 selected stations along the Selangor River. Sampling was conducted once per day and night. Sweeping method by using sweep nets were used as the arthropod sampling method. Data analysis was done quantitatively to determine the composition of arthropod community. A total of 7,707 individual arthropods collected belonging to 10 different orders consisting of Coleoptera, Hymenoptera, Diptera, Neuroptera, Orthoptera, Odonata, Lepidoptera, Blattodea, Mantodea and Araneae. A total of 4,563 arthropod individuals were sampled at night, which was more than the daytime (3,144 individuals), with Station 17 recorded the highest arthropod individual out of the 19 sampling sites. During the night, the firefly, that belongs to the Lampyridae family showed the highest arthropod composition. The presence of arthropod biodiversity along the Selangor River reveals that the S. caseolaris area is important in maintaining a diverse community of fireflies and other arthropods for conservation purposes.

This checklist serves as a basic information based on compilation from published literatures, internet database, and from specimens collection stored at Center of Insect Systematics Universiti Kebangsaan Malaysia. To date, this study compiled smaller arachnids (28 species) and Pseudoscorpiones (41 species) that had been recorded in Malaysia. Although smaller arachnid orders were concentrated at localities with average rainfall and humidity, Pseudoscorpiones can be found at both wet and dry environments. More work is needed to determine the species diversity and distribution of these cryptic group.

Diversity of spider groups have received less research attention and there are limited published references for spiders from Peninsular Malaysia. The current survey was conducted to locate and identify foliage-dwelling spiders (Arachnida, Araneae) at five different sites in Peninsular Malaysia. Spider specimens were collected using manual search and sweep-netting between September 2012 and November 2012. A total of 92 morpho-species from 65 genera that belong to 15 families have been successfully recorded and identified. The greatest proportion of specimens captured (40%) were Foliage-runners (Clubionidae, Miturgidae, Oxyopidae, Pisauridae, Salticidae, Scytodidae, Thomisidae), followed by orb-weavers (Araniedae, Nephilidae, Tetragnathidae, Uloboridae) (36.5%), space-weavers (Pholcidae, Psechridae Theridiidae) (21.5%) and ground-dwellers (Sparassidae) (2.0%). Cluster analysis has revealed that the same habitat types share a more similar diversity composition compared to different habitat types, which indicates that spider assemblage composition was partly co-dependent on vegetation structure. However, no significant difference in spider assemblage composition was found between all the five sites which follows that these diurnal group of spiders are actually adaptable to various habitat types. Key words: Araneae, distribution, diurnal, diversity, guild structure

This is the first series on harvestmen species representing a total of 67 species from 25 genera and 9 families of harvestmen (Opiliones) from Malaysia compiled from available literatures between 1900s till date. In addition, the preliminary field survey identified six harvestmen species which are Dentobunus luteus, Gagrella longipalpis, Koyamaia curvipes, Marthana ferruginea, Zaleptus quadrimaculata and Hoplodino gapensis collected at Bukit Sawak, Langkawi Island (Kedah) and Hutan Lipur Lata Jarum (Pahang) which are considered as new locality record forthis country. This information could serve as basic guideline and reference for future studies on harvestmen in Malaysia. � 2017, Centre for Insects Systematic, Universiti Kebangsaan Malaysia.

This paper is the second part of a continuing series, with the main objective of compiling and recording the spider species that can be found in Sabah, Malaysia. Based on the specimens collected during this field trip, a total of 50 new records of spider species from 11 families and 37 genera have been found. This includes one newly discovered spider species, the Leucauge sabahan sp. nov which is described based on a female specimen. It is hoped that this inventory can be used to assist in the knowledge about the spider species for this stage. In summary, an increment of 18% from the total number of spider species has contributed to a total of 272 recognized spider species recorded in Sabah, Malaysia.

Orb-web building spiders choose quality microhabitat to optimise foraging success. In this study, web-site selection of 12 tetragnathid species was investigated to determine its influence on the web characteristics. The two most significant variables were web size and the web height from ground (web-site). Statistical analyses showed that some tetragnathid species that coexist within the same habitat had very little clustering in terms of web characteristics, while other species showed many similarities. This study on the web characteristics provides an insight into the tetragnathid species� ability to respond to different habitats and develop niches. Using the web characteristic variables in the principal component analyses (PCA), individuals of conspecifics clustered together instead of mixtures of individuals from different species. This finding suggests that tetragnathid spiders exhibit niche partitioning in some habitats and their web characteristics may determine the web placement in a particular habitat type.