14 Species of freshwater Calanoida in Thailand are reported in this study. The most common species is Neodiaptomus botulifer. Most of these belong to the Southeast Asian species, the remainder are either Indian or East Asian copepods. The zoogeographical demarcation of copepods in Thailand is not very distinct due to its interconnecting riverine and reservoir systems as well as frequent flood. The peculiarity of the Thai Calanoida and their distribution is discussed in a Southeast Asia context. A taxonomic key to the Thai Calanoida is formulated.

The systematics and geographical distribution of Malaysian and Singapore freshwater calanoid copepods are discussed in details . Neodiaptomus handeli Brehm, N. laii Kiefer, N. blachei (Brehm), N. botulifer Kiefer, N. mephistopheles Brehm, Pseudodiaptomus (Schmackeria) dauglishi Sewell, P. (S .) tollingerae Sewell and Tropodiaptomus spp . Kiefer are all present in the northwestern part of the Peninsula . There are only 4 species, namely, N. handeli, N. botulifer, N. meggitti Kiefer and Tropodiaptomus s p . in the southern half of the Peninsula . The whole of the east coast also has 4 species, i .e. N. handeli, N. malaindosinensis (n .n .), P. (S.) tollingerae and one species of Tropodiaptomus. The only species that cut across a wide range of geographical barriers are N. handeli and Tropodiaptomus.

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distribution of these organisms in the region. This paper reviews the systematic status and geographical distribution of 30 odd species of freshwater calanoid copepods in Southeast Asia. Three regions are delineated based on the diversity and abundance of these organisms; Region I being the Southasiatic element, Region II the attenuated belt of copepods and Region III rich in endemic species. The implication of a northsouth diminishing of copepod species to inland fisheries is postulated.

The problem associated with the systematics of a freshwater calanoida copepoda, Neodiaptomus botulifer Kiefer and one of its related forms was described . In order to solve this problem a new species, Neodiaptomus malaindosinensis is created in its place . The geographical distribution of these two calanoid species was briefly discussed .

In Peninsular Malaysia there are three species of Tropodiaptomus namely: T. hebereri Kiefer, T. ruttneri Brehm, and T. vicinus Kiefer. The last species is most common in swampy habitats along the west coast whereas T. ruttneri occurs only in the north and T. hebereri is present in the south. The affinity of the Malaysian tropodiaptomids and their Sunda counterparts is discussed.

Cinq espèces de copépodes calanoides de l'eau douce des Philippines, avec leurs distributions et leur taxonomies, sont décrites. Deux espèces d'entre eux, Tropodiaptomus gigantoviger et Filipinodiaptomus insulanus n. g., sont endèmes pour les îles des Philippines. T. vicinus est abondant dans les provinces du sud. Monglodiaptomus birulai est présent seulement dans les endroits isolés à côté de la Ville Baguio. Une clé taxonomique pour les copépodes calanoides de l'eau douce des îles des Philippines est formulé.

The life cycle of Diaptomus oregonensis in a partially meromictic lake was investigated during 1966–68. Three annual generations were produced in each of 1967 and 1968 when conditions were optimal. In 1966 no third generation appeared and D. oregonensis vanished in September, presumably after depositing resting eggs. Food scarcity is suggested as the cause of both slow summer development and production of resting eggs.