The taxonomy of the Onchidiidae is currently being revised based on extensive sampling, molecular data, and examination of all type specimens available. A new genus, Alionchis Goulding & Dayrat, new genus is described here for a new species, Alionchis jailoloensis Goulding & Dayrat, new species, which is highly distinct from all other onchidiids. Alionchis jailoloensis lives on the mud in mangrove forests and can be easily identified in the field by its large eye tentacles and a hyponotum with a bright white margin. A new genus name is created because Alionchis jailoloensis does not belong to any existing onchidiid genus. The present study is based on an integrative approach to taxonomy, using nomenclatural history, comparative anatomy, molecular data, as well as natural history field observations. Alionchis jailoloensis is endemic to Halmahera, eastern Indonesia. Onchidium meriakrii Stantschinsky, 1907, with a type locality in Queensland, Australia, is transferred to Alionchis but is regarded as a nomen dubium

The taxonomy of the Onchidiidae is currently being revised based on extensive sampling, molecular data, and examination of all type specimens available. A new genus, Alionchis Goulding & Dayrat, new genus is described here for a new species, Alionchis jailoloensis Goulding & Dayrat, new species, which is highly distinct from all other onchidiids. Alionchis jailoloensis lives on the mud in mangrove forests and can be easily identified in the field by its large eye tentacles and a hyponotum with a bright white margin. A new genus name is created because Alionchis jailoloensis does not belong to any existing onchidiid genus. The present study is based on an integrative approach to taxonomy, using nomenclatural history, comparative anatomy, molecular data, as well as natural history field observations. Alionchis jailoloensis is endemic to Halmahera, eastern Indonesia. Onchidium meriakrii Stantschinsky, 1907, with a type locality in Queensland, Australia, is transferred to Alionchis but is regarded as a nomen dubium.

During a faunistic expedition of Thien Duong Cave in Central Vietnam, specimens of two species of cave-dwelling cyclopoid copepods, belonging to two genera, were encountered in a small pool filled by drip water that was well separated from other water bodies within the cave. One group of specimens was tentatively assigned to Bryocyclops anninae (Menzel, 1926), representing the first record of the genus in Vietnam. The other species was recognised as a new species, most similar to Graeteriella longifurcataTran & Chang, 2013, which was originallydescribed from a syphon lake in the same cave. Detailed analyses of the morphological characters of both species revealed that they both actually belong to a new genus, Pseudograeteriella, established herein. The new genus can be distinguished from the closely related European genus, Graeteriella Brehm, 1926, by characters on the P1–P5, in the structure of genital segment in females, and in the armament and proportions of furcal rami. The two species of the Pseudograeteriella,new genus, differ considerably from each other in their mouthparts, characters on the P1–P5, and furcal rami. A generic diagnosis for Pseudograeteriella, new genus, and a detatailed description of P. longiaesthetascus, new species and redescription of B. anninae are provided.