New Ancorabolidae (Copepoda: Harpacticoida) from Korea: two new genera, revisionary notes and updated identification keys

Abstract

Abstract Two new copepod species of the Ceratonotus group in the subfamily Ancorabolinae (Ancorabolidae) are described from the Korean peninsula. Dendropsyllus kimi sp. nov. differs from its congeners by the one-segmented ♀ P3 endopod, the inner spine on ♀ P5 exopod and the absence of sensillate tubercles on abdominal somites 1 and 2. Dimorphipodia gen. nov. is proposed to accommodate Dimorphipodia changi sp. nov. and can be differentiated from its sister taxon, Arthuricornua, by the sexual dimorphism in P2–P4 exp-3, the absence of paired laterodorsal processes near the posterior margin of the cephalothorax and the presence of pleural setular tufts on somites bearing P2–P4. Ancorabolina, previously placed in the Ancorabolinae, is transferred to the Laophontodinae, whereas Patagoniaella is provisionally reassigned to the family Cletodidae. Within Laophontodes, the inadequately described Laophontodes brevis, Laophontodes ornatus and Laophontodes propinquus are relegated to species inquirendae. Laophontodes georgei sp. nov. is proposed for the unavailable name Laophontodes norvegicus, Laophontodes multispinatus is reassigned to Lobopleura, and Laophontodes gracilipes is fixed as the type of Rostrophontodes gen. nov., the potential sister group of Ancorabolina. The authenticity of Laophontodes bicornis and other dubious ancorabolid records from the Korean peninsula is discussed. Updated keys to genera of both Ancorabolinae and Laophontodinae and to species of Laophontodes are provided.