Les articles ainsi que les nouveautés nomenclaturales publiés dans Zoosystema sont référencés par / Articles and nomenclatural novelties published in Zoosystema are referenced by:-ZooBank ® (http://zoobank.org) PHOTOCOPIES :Les Publications scientifiques du Muséum adhèrent au Centre Français d'Exploitation du Droit de Copie (CFC), 20 rue des Grands Augustins, 75006

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Eight species from seven genera of crabs from two families are reported for the first time from the coastal areas of Taiwan, including estuaries, coral reefs and sandy beaches. These are Clistocoeloma balansae A. Milne-Edwards, 1873, C. villosum (A. Milne-Edwards, 1869) and Parasesarma ungulatum (H. Milne Edwards, 1853) of the Sesarmidae; and Cyclograpsus longipes Stimpson, 1858, Otognathon uru N. K. Ng, Komai & P. K. L. Ng, 2009, Ptychognathus pilosus De Man, 1892, Pyxidognathus granulosus A. Milne-Edwards, 1879 and Scutumara laniger (Tesch, 1918) of the Varunidae.

The blue king crab, Paralithodes platypus, which belongs to the family Lithodidae, is a commercially and ecologically important species. However, a high‐quality reference genome for the king crab has not yet been reported. Here, we assembled the first chromosome‐level blue king crab genome, which contains 104 chromosomes and an N50 length of 51.15 Mb. Furthermore, we determined that the large genome size can be attributed to the insertion of long interspersed nuclear elements and long tandem repeats. Genome assembly assessment showed that 96.54% of the assembled transcripts could be aligned to the assembled genome. Phylogenetic analysis showed the blue king crab to have a close relationship with the Eubrachyura crabs, from which it diverged 272.5 million years ago. Population history analyses indicated that the effective population of the blue king crab declined sharply and then gradually increased from the Cretaceous and Neogene periods, respectively. Furthermore, gene families related to developmental pathways, steroid and thyroid hormone synthesis, and inflammatory regulation were expanded in the genome, suggesting that these genes contributed substantially to the environmental adaptation and unique body plan evolution of the blue king crab. The high‐quality reference genome reported here provides a solid molecular basis for further study of the blue king crab's development and environmental adaptation.

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Intertidal mudflat crabs of the genus Metaplax H. Milne Edwards, 1852 (Crustacea: Brachyura: Varunidae) from China, Taiwan, and northern Vietnam are taxonomically revised by morphological and molecular evidence. These crabs show sexual dimorphism and morphological variation of a considerable range in the infraorbital ridge, one of the primary features previously used for species identification. In this study, four species were identified from the region: M. elegans De Man, 1888; M. longipes Stimpson, 1858; M. sheni Gordon, 1930; and M. tredecim Tweedie, 1950. Based on the results of the morphological examination, and as confirmed by molecular evidence from mitochondrial cytochrome oxidase subunit I (COI), taxonomic confusion surrounding M. longipes was resolved, and M. takahasii Sakai, 1939, is considered a junior synonym of M. longipes. The geographical distribution of Metaplax longipes extends along the shores of China, north to Jiangsu, whereas the Southeast Asian M. tredecim was newly recorded from northern Vietnam and Hong Kong.

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The potential use of polychaetes as feed for mud crabs and to bioremediate highly underexploited nutrient‐rich aquaculture waste was evaluated in this study. Food preference of mud crabs (Scylla olivacea) given two polychaete species, namely Namalycastis sp. (Nereididae) and Eunice reticulata, was first determined prior to elucidating the growth, survivorship and fatty acid composition of the selected polychaetes cultivated using fish culture waste (FCW). The effect of water temperature on the sexual maturation of selected polychaetes was also evaluated. Mud crabs fed on both polychaete species but a preference for Namalycastis was observed. Namalycastis fed FCW experienced lower survivorship (16.7%–58.3%) than those in control treatments of either fish feed or no feed (41.7%–100%), although statistically there were no significant differences between treatments for all three experiments. This could probably be due to mortality of FCW‐grown Namalycastis after spawning. FCW‐grown Namalycastis had significantly higher (p < .05) wet length than unfed polychaetes. Sexual maturation in Namalycastis was not affected by lowering ambient temperature from 28°C to 26°C. Compositions of arachidonic acid, eicosapentaenoic acid and docosahexaenoic acid were higher in FCW‐grown Namalycastis than unfed Namalycastis. Overall, Namalycastis can be cultured in captivity using FCW but further research is required to mass produce the polychaetes economically and sustainably.