Caligus diaphanus Nordmann 1832

Caligus diaphanus -group Leg 4 3-segmented with I, I, III spines respectively; leg 1 last exopodal segment with three posterior/medial pinnate setae, terminal spines 2 and 3 apparently without accessory processes; leg 2 second and third endopodal segments’ surfaces covered with fine setules and distolateral spines of first and second exopodal segments aligning to longitudinal axis of rami; antenna without proximal process; post-antennal process tine vestigial or weakly developed (Boxshall 2018).