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This study describes a new genus and new species of Tanaidacea that was collected from inside the tests of dead Tetraclita barnacles in Singapore. Xenosinelobus n. gen. is most similar to Sinelobus but can be distinguished by the (1) unusually short antennal fifth article, (2) tooth-like lacinia mobilis on right mandible, (3) long terminal seta on epignath, (4) plumose inner seta near dactylus insertion on cheliped propodus, (5) spiniform seta on pereopod 1 coxa, (6) presence of setae on inner margins of pereopod 1 propodus and dactylus, (7) claw-like terminal articles on pereopods 2 and 3, (8) row of setulose and flattened denticulate setae along distal margin of pereopod 6 propodus, (9) dorsal seta on claws of pereopods 4–6, (10) complete row of dorso-transverse setae on pleonites 1 and 2, (11) one seta on pleopod basis outer margin, (12) two or three setae on pleopod endopod inner margin and (13) three-articled uropod with final article 1.6 times as long as preceding article. A new diagnosis and key to genera is provided for the subfamily Sinelobinae.

This study describes a new genus and two new species of Tanaidacea that were collected from the Singaporean exploratory area (OMS) of the polymetallic nodule fields in the eastern end of the Clarion-Clipperton Fracture Zone, Pacific Ocean. The descriptions are based on material collected during the research cruise ABYSSLINE II, which was conducted in the year 2015, covering abyssal depths of 4041–4227 m. These new species are paratanaoideans belonging to the genera Unispinosus n. gen. and Portaratrum Guerrero-Kommritz, 2003 of the family incertae sedis.

Three new species of agathotanaids belonging to the genera Agathotanais, Bunburia and Paranarthrura are described. The descriptions were based on material collected from southwestern Java, Indonesia, Indian Ocean during the research cruise SJADES in 2018. The specimens were obtained using a box corer from lower bathyal depths of 836–2,355 m. These three genera are recorded from Southeast Asia for the first time.

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