A new species of Helmutkunzia Wells & Rao, 1976 from an intertidal sandy beach in Xiamen, China and proposal of Pseudobalucopsylla gen. nov. (Copepoda Harpacticoida, Miraciidae) Author Mu, Fanghong College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao 266003, Shandong Province, China. Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW 7 5 BD, U. K. Author Huys, Rony 0000-0003-2411-7003 fanghongmu@ouc.edu.cn text Zootaxa 2021 2021-10-12 5051 1 487 505 journal article 4023 10.11646/zootaxa.5051.1.19 0c8b11dc-564b-461b-9cb1-3cd61111f9b2 1175-5326 5563851 A607CB5B-51E7-45FD-9104-980175BBB163 Pseudobalucopsylla costaricensis sp. nov. urn:lsid:zoobank.org:act: F7FA7534-3C9C-4600-8D49-3FC0E842172C Balucopsylla triarticulata Wells & Rao, 1987 sensu Mielke (1994: 56–57 , Fig. 1 ) Differential diagnosis. Pseudobalucopsylla . Body length 360–550 μm ( ♀ ), 380–480 μm ( ♂ ). Rostrum, mandibular exopod and P4 not documented. P5 exopod ♀ rectangular, inner and outer margins virtually straight, 2.5 times as long as maximum width; innermost element setiform and minutely bipinnate. P5 endopodal lobe ♀ extending beyond middle of exopod; both distal elements setiform and plumose, inner one 1.3 times length of outer one; distal inner element spiniform and bipinnate; proximal inner spine unipectinate, massive and originating on posterior surface of endopodal lobe. P5 exopod ♂ distal inner seta (= 2 nd from inner margin) 3.6 times length of proximal inner seta; endopodal lobe ♂ extending beyond middle of exopod. Caudal ramus seta III unconfirmed; sexual dimorphism in size not recorded. Type material. The female specimen illustrated by Mielke (1994) in his Fig. 1A–C is here designated as the holotype of P. costaricensis sp. nov. ( ICZN Arts 16.4 and 72.5.6) . Type locality. Costa Rica , Pacific coast, Gulf of Nicoya , Punta Morales ; sandy beach, white and coarse sand with high detritus content; surface water temperature above 25°C; salinity about 32‰; mean tidal range 2.3 m . Etymology. The specific epithet refers to Costa Rica where the type locality is situated. Notes. Mielke (1994) reported variability in the relative length of P1 enp-1. Specimens with a long endopod (with enp-1 extending beyond the distal margin of exp-3) usually have an inner seta on P2–P4 enp-3. As Mielke suggested himself this may be indicative of the presence of two species in his samples.