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Genus Neoacrenhydrosoma gen. nov. Diagnosis. Cletodidae. Body with pronounced spinulose socles on urosome; penultimate somite without hyaline, dentate pseudoperculum; anal operculum in posterior half of anal somite. Caudal rami cylindrical, about ®ve times longer than broad, setae I and II implanted at 25%, and setae III and VII at 34%, of ramus length. Rostrum recurved dorsally with slightly bi®d tip. Antennule ®ve-segmented in female, seven-segmented and sub-chirocer in male; second segment with ¯exible penicillate seta; trithek of distal segment with small aesthetasc and two naked setae; in male swollen ®fth segment with a chitinous hump on palmar margin, sixth segment with strong naked spine. Antennal allobasis with one seta proximally on abexopodal margin, exopod one-segmented with two setae; endopod with two spines and a seta sub-distally and, on distal margin, three spines, two geniculate setae, a minute seta fused to base of inner spine and a tube pore. Mandibular palp one-segmented with three setae. Maxillulary coxal endite, partially fused to basis, and bearing two setae; palp one-segmented with six setae. Distal syncoxal endite of maxilla with three naked setae. Maxillipedal syncoxa with large pinnate seta on distal margin. P1 exopod three-segmented, two setae on distal margin of exp-3 without comb tips, outer seta very short; endopod two-segmented, enp-2 with three armature elements without comb tips. P2±P4 rami both two-segmented, exp-1 with two outer spines, enp-2 with only two setae; male P3 endopod as in female. P5 triangular, uniramous, strongly chitinized, projecting laterally from body; peduncle bearing outer basal seta articulating medially on anterior face, distal portion a mucroniform process recurved distally, bearing two setae on outer distal margin and, in female only, a proximal spine on inner margin. Female genital ®eld with spinulose vestigial P6s bearing two setae, common genital slit partially occluded medially; copulatory pore small. Type species. N. zhangi sp. nov. by monotypy. Etymology. The pre®x Neo is from the Greek neos meaning new, referring to the presence, in the adult, of juvenile characteristics; the retention of Acrenhydrosoma indicates that it is closely related to that genus. Gender. Feminine.

Genus Neoacrenhydrosoma gen. nov. Diagnosis. Cletodidae. Body with pronounced spinulose socles on urosome; penultimate somite without hyaline, dentate pseudoperculum; anal operculum in posterior half of anal somite. Caudal rami cylindrical, about ®ve times longer than broad, setae I and II implanted at 25%, and setae III and VII at 34%, of ramus length. Rostrum recurved dorsally with slightly bi®d tip. Antennule ®ve-segmented in female, seven-segmented and sub-chirocer in male; second segment with ¯exible penicillate seta; trithek of distal segment with small aesthetasc and two naked setae; in male swollen ®fth segment with a chitinous hump on palmar margin, sixth segment with strong naked spine. Antennal allobasis with one seta proximally on abexopodal margin, exopod one-segmented with two setae; endopod with two spines and a seta sub-distally and, on distal margin, three spines, two geniculate setae, a minute seta fused to base of inner spine and a tube pore. Mandibular palp one-segmented with three setae. Maxillulary coxal endite, partially fused to basis, and bearing two setae; palp one-segmented with six setae. Distal syncoxal endite of maxilla with three naked setae. Maxillipedal syncoxa with large pinnate seta on distal margin. P1 exopod three-segmented, two setae on distal margin of exp-3 without comb tips, outer seta very short; endopod two-segmented, enp-2 with three armature elements without comb tips. P2±P4 rami both two-segmented, exp-1 with two outer spines, enp-2 with only two setae; male P3 endopod as in female. P5 triangular, uniramous, strongly chitinized, projecting laterally from body; peduncle bearing outer basal seta articulating medially on anterior face, distal portion a mucroniform process recurved distally, bearing two setae on outer distal margin and, in female only, a proximal spine on inner margin. Female genital ®eld with spinulose vestigial P6s bearing two setae, common genital slit partially occluded medially; copulatory pore small. Type species. N. zhangi sp. nov. by monotypy. Etymology. The pre®x Neo is from the Greek neos meaning new, referring to the presence, in the adult, of juvenile characteristics; the retention of Acrenhydrosoma indicates that it is closely related to that genus. Gender. Feminine., Published as part of Gee, J. M. & Mu, F-H., 2000, A new genus of Cletodidae (Copepoda; Harpacticoida) from the Bohai Sea, China, pp. 809-822 in Journal of Natural History 34 (6) on pages 810-811, DOI: 10.1080/002229300299273, http://zenodo.org/record/4747509