Four new genera of the Ceratonotus group (Copepoda, Harpacticoida), including the description of two new species Author George, Kai Horst 4399979D-C00B-4798-A524-2F51E8DAB73C Senckenberg am Meer Wilhelmshaven, German Centre for Marine Biodiversity, Research DZMB, Südstrand 44, 26382 Wilhelmshaven, Germany kai.george@senckenberg.de text European Journal of Taxonomy 2021 2021-10-05 774 1 41 http://dx.doi.org/10.5852/ejt.2021.774.1525 journal article 3955 10.5852/ejt.2021.774.1525 99c32064-4486-485b-9325-007d7742386e 2118-9773 5552801 2A222C72-8D78-4C57-B7A7-EF1DFFDB6831 Pseudopolyascophorus gen. nov. urn:lsid:zoobank.org:act: D9585661-5A33-40AF-938F-CA881880B7E9 Type and only species Pseudopolyascophorus monoceratus (George et al. , 2013) gen. et comb. nov. Polyascophorus monoceratus George et al ., 2013: 20–33 , figs 2–8. Etymology The genus name is compound by the Greek ψευδής [pseudes] (‘misleading’, ‘deceiving’) and the genus name Polyascophorus , indicating an ostensible morphological similarity of Polyascophorus and Pseudopolyascophorus gen. nov. Gender: masculine. Diagnosis Member of Cletodidae T. Scott, 1904 , Cletodinae T. Scott, 1904 and the Ceratonotus group sensu Conroy- Dalton (2001). Body more or less cylindrical, tapering slightly posteriorly, without clear demarcation between pro- and urosoma. Sexual dimorphism in A1, P3, P4, P5, and P6; females with GDS due to fusion of last (P6-bearing) thoracic and first abdominal (genital) somite. Cphth comprising approximately ¼ of body length; rostrum fused to cephalothorax, enlarged and Y-shaped; with long tube pore but no rostral setulose tuft (RST). Cphth with paired knobbed frontolateral horns (FLH), cephalothoracic posterior lateroventral (CLVPp) and laterodorsal processes (CLDPp); CLVPp bifurcated. Thoracic somites bearing P2–P5 with dorsal cuticular processes DP1–DP4. First abdominal somite (= posterior part of female GDS) with single centred DP5. Cphth, body somites, and furca with tube pores dorsally and/or laterally. Furcal rami barely 4 times as long as broad, rounded at their apical outer margin; with 7 setae (I–VII). Female A1 4-segmented, with first segment elongated and bearing long spinules on inner margin, and with aesthetasc on third and fourth segment. Male A1 6-segmented, subchirocer. A2 with allobasis, without endopod; allobasis with 2 abexopodal setae. Endopod as long as allobasis, with 2 spinulose frills (sub)apically. P1 with 2-segmented exopod; exp-1 with 1 bipinnate outer spine, exp- 2 with 4 apical, geniculate setae and 1 outer spine; endopod 2-segmented in female, with 1 apical seta, absent in male. P2–P4 with 3-segmented exopods; exp-1 with 1 outer spine, exp-2 with 1 outer spine and 1 inner seta; exp-3 with 2 outer spines and 2 apical setae, and with 1 (P2, P4) or 2 (P3) inner setae. P2 without endopod. P3 endopod in female 2-segmented, carrying 2 apical setae; in male 3-segmented with a small bare enp-1, elongated enp-2 with a curved apophysis on inner apical margin, and 2 apical setae on small enp-3. P4 endopod 2-segmented; enp-1 small, unarmed, enp- 2 in female with 1 apical seta; in male with 2 apical setae and 1 outer spine. P5 with baseoendopod and exopod fused, sexually dimorphic; endopodal lobe completely reduced and represented by 1 seta and 1 tube pore in female, and by 2 setae and 2 tube pores in male. Female genital field with gonopore covered by genital operculum formed by the reduced P6, with 1 seta on each side.