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One individual referable to Calliopiidae G.O. Sars, 1893 was collected from a chemically reduced habitat, the hydrothermal vent systems in Okinawa Trough, and was identified as a new genus and species belonging to this family after a morphological examination. A formal description of this new species and a discussion of the relationship of the new genus within Calliopiidae are presented.
The genus Hybovalgus Kolbe, 1904 is represented by eight species on the Chinese mainland, many of which also inhabit northern Vietnam and Laos. Species of Hybovalgus are endemic to this area, and to the island of Taiwan. Until now, there is a lot of confusion in our knowledge of Hybovalgus on mainland China, due to erroneous descriptions of new species by European entomologists and incorrect identifications of specimens by local entomologists. Study of more material and many types has clarified this situation by better defining the species, synonymizing some of them, describing one new species, Hybovalgus calvus sp. nov. and recognizing the fact that females of two species were included in the new genus Excisivalgus Endrödi, 1952, which is here synonymized with Hybovalgus.