Bryocyclops maholarnensis, new species, is a stygobiotic copepod found in four caves in northeastern Thailand. It is described and figured hereafter. The new species shares some characteristics with those of species from the Group II sensu Lindberg (1954). However, it stands out by having the following distinctive features: no modified spine in the male P3 endopod-2; P1 with an inner basal spine but no inner coxal seta; intercoxal plate on P1–P4 with acute protuberances; a setal and spine formula of P1–P4 exopod-2: 5.5.5.4 and 3.3.3.3. It also has a reduced number of armature elements on the P4 endopod

A new species of the clawed lobster genus Nephropsis Wood-Mason, 1872, collected recently by the South Java Deep-Sea Biodiversity Expedition (SJADES 2018) off the southern coast of Java in Indonesia, is described. The new species is closely related to Nephropsis carpenteri Wood-Mason, 1885, but differs in the shapes of the carinae and groove on the carapace, as well as in the spination and relative length of the pereopods. The large sequence divergence in the barcoding gene COI also supports the recognition of the new species.

A new species of the thorid genus Lebbeus White, 1847, L. java new species, is described on the basis of two ovigerous female specimens from south of Java, Indonesia, collected at depths of 637–689 m. It is morphologically most similar to L. formosus Chang, Komai & Chan, 2010, known from off Taiwan, amongst about 70 congeners, but subtle morphological differences and genetic divergence estimated from the barcoding segments of the mitochondrial COI gene warrant the recognition of the new species. The new species is the third representative of Lebbeus from Indonesian waters.

A new monotypic erigonine genus, Pahangone, new genus, with P. mirabilis, new species as the type species, is described from West Malaysia. The new genus is characterised by such a peculiar combination of characters, both somatic and genital, that its taxonomic position within Erigoninae remains unclear.

A new monotypic erigonine genus, Pahangone, new genus, with P. mirabilis, new species as the type species, is described from West Malaysia. The new genus is characterised by such a peculiar combination of characters, both somatic and genital, that its taxonomic position within Erigoninae remains unclea