Mangrove and estuary ecosystems are important components of the intertidal area which is the habitat of Ocypodid crabs. The study of Ocypodid crabs in Ujung Kulon National Park is still limited, while its habitat is decreasing. This study was conducted to explore the Ocypodid crabs (Brachyura: Ocypodidae) composition in mangrove and estuary ecosystems in Ujung Kulon National Park. Crabs species collection was carried out in Legon Cibariang, Panaitan Island and Cikawung, Ujung Kulon National Park. Four species of Ocypodid crabs, Ocypode ceratophthalma (Pallas, 1772), Uca annulipes (H. Milne Edwards, 1837), U. coarctata (H. Milne Edwards, 1852) and U. triangularis (A. Milne Edwards, 1873) were successfully collected from mangrove and estuary ecosystems. The species composition of Ocypodidae in Cikawung were more various than in Legon Cibariang.

<strong>Diversity, Abundance, and Distribution of Copepods (Crustacea) in the Mangrove Area of Segara Anakan, Cilacap.</strong> Observations on the diversity of Copepods, its abundance, and its distribution in three mangrove and estuarine locations in Segara Anakan Lagoon, Cilacap, were conducted in May (dry season) and November (rainy season) 2009. This study aims to determine the relationship of diversity and abundance of Copepods with some environmental factors that affect its distribution in the dry and rainy seasons. Copepod samples were taken from Kutawaru waters, Dermaga Sleko, and Ciperet using vertical and horizontal plankton nets, day and night. They were then preserved, deposited, and identified in MZB LIPI. There were 36 species of Copepods from 18 genera and 20 families, including 10 new records. The highest species diversity of Copepods was recorded in November, while the lowest was in May. The average abundance in May was higher than in November. The diversity and abundance in Ciperet in both dry and rainy seasons were always higher than the other two sites. Acartia erythraea, A. sinjiensis and Pseudodiaptomus annandalei were found to dominate the waters especially during the dry season in May. The community composition of Copepods occupying the waters was determined by salinity, while its activity and development were determined by temperature. <br />

Tmethypocoelis Koelbel, 1897, is a central Indo-West Pacific genus of small intertidal, soft sediment dotillid crabs that includes five recognised species. Two new species, Tmethypocoelis simplexsp. nov. and T. celebensissp. nov., are here described from Sulawesi, Indonesia. Tmethypocoelis simplexsp. nov. is found on the west coast of Central Sulawesi, while T. celebensissp. nov. occurs in the north-eastern part of Sulawesi. Both new species differ from each other and known congeners by the male cheliped, male pleon, and male first gonopod characters. The differences in gastric mill morphology further confirm the two species as new. The distinct water current patterns in the Makassar Strait and the Maluku Channel might have contributed to the evolution of these two sibling species.

The gastric mill is a prominent structure in the digestive system of brachyuran crabs, consisting of a median tooth plate and a pair of lateral tooth plates. Among crab species that are deposit feeders, the morphology and size of the gastric mill teeth are correlated with the preferred substrate types and food spectrum. In this study, we provide a detailed description of the morphology of the median and lateral teeth of the gastric mills in eight species of dotillid crabs from Indonesia, and compare them in relation to habitat preferences and molecular phylogeny.Ilyoplax delsmani, Ilyoplax orientalis, and Ilyoplax strigicarpus have comparatively simple shapes of their median and lateral teeth, with fewer teeth on each lateral tooth plate compared to Dotilla myctiroides, Dotilla wichmanni, Scopimera gordonae, Scopimera intermedia, and Tmethypocoelis aff. ceratophora, which have more complexly shaped median and lateral teeth, with a greater number of teeth on each lateral tooth plate. The number of teeth on lateral tooth correlates with habitat preference, that is, dotillid crabs inhabiting muddy substrata have fewer teeth on the lateral tooth plate, and those inhabiting sandy substrata have a more teeth. Phylogenetic analysis using partial COI and 16S rRNA genes supports that teeth morphology is similar among closely related species. Therefore, the description of median and lateral teeth of the gastric mill is expected to contribute to the systematic study of dotillid crabs.

Pengamatan keragaman, kelimpahan dan distribusi Kopepoda pada tiga stasiun mangrove dan estuarin Muara Angke, Teluk Jakarta dilakukan di musim kemarau (Mei) dan musim hujan (September-Oktober) 2010. Tujuan penelitian ini untuk menyelidiki hubungan keragaman dan kelimpahan Kopepoda dengan beberapa faktor lingkungan yang mempengaruhi pola sebaran pada musim kemarau dan musim hujan. Tercatat 38 jenis dari 21 genus dan 17 suku kopepoda, termasuk dua jenis yang baru dideskripsi dari perairan Jawa yaitu Calanopia asymmetrica dan Labidocera javaensis, dan tiga catatan baru dari lokasi ini, Bestiola similis, Pseudodiaptomus incisus dan Pontellopsis inflatodigitata. Densitas tertinggi tercatat di musim kemarau, sedangkan terendah di musim hujan. Hubungan antara distribusi jenis Kopepoda dominan dan salinitas didiskusikan lebih lanjut.

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During taxonomic studies on the pelagic copepods of the Indonesian waters, seven species of