Caligus macarovi Gusev 1951

Caligus macarovi -group Leg 4 3-segmented with compound distal segment armed with only 3 terminal spines (without lateral spine), thus I, III spines respectively; leg 1 distal exopodal segment with 3 posterior/medial pinnate setae, 3 terminal spines (1, 2 and 3) with accessory processes on spines 2 and 3, seta 4 distinctly longer than terminal spines; antenna with proximal posterior process; maxilla with marginal serrations on distal margin of brachium; abdomen 1-segmented in female (Boxshall 2018).