Johnwellsia, a new intertidal genus of Parastenheliidae (Copepoda, Harpacticoida) from the Taiwan Strait, China, including a review of the family and key to genera Author Huys, Rony 0000-0003-2411-7003 Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW 7 5 BD, U. K. r.huys@nhm Author Mu, Fanghong 0000-0002-6172-9271 College of Marine Life Science, Ocean University of China, 5 Yushan Road, Qingdao 266003, China. text Zootaxa 2021 2021-10-12 5051 1 236 318 https://doi.org/10.11646/zootaxa.5051.1.13 journal article 3979 10.11646/zootaxa.5051.1.13 a82cb38a-03d5-4d23-845c-436529542679 1175-5326 5572417 F94203E7-FCD1-4975-BAD3-0DF534806712 Thalestrella obscura ( Mielke, 1994b ) comb. nov. Karllangia obscura Mielke, 1994b Original description. Mielke (1994b) : 148, 150–152; Figs 7–8. Type locality. Costa Rica , beach slope of Manzanillo (Caribbean coast) . Notes. Thalestrella obscura comb. nov. occurs sympatrically with T. pulchra comb. nov. at the type locality. It differs from the latter by the absence of well developed denticulodigitate hyaline frills on the abdominal somites and the inner seta on P1 exp-2, and by the presence of a tuft of very long setules on the male antennary allobasis near the articulation with the exopod, and only five elements on the female P5 exopod.