Fig. G1A: Calanus finmarchicus (female) (schematic lateral view). (after G.O. Sars, 1903).

Ceph.: cephalosome (cephalon + one pedigerous somite); Metas.: metasome (pedigerous somites between the cephalon and the main body articulation); CA: anterior body or prosome; Uros.: urosome (posterior part of the body behind the main articulation, corresponding to the abdomen + thoracic somites forming the genital complex); CP: posterior body; m: muscles; FR: rostral filaments; A1: left antennule; Sgn: genital complex; An: anus (dorsal position); F: furca.