Spinoncaea ivlevi (Shmeleva, 1966), female, robust form (northwestern equatorial Pacific) A labrum, anterior, white arrow indicating setules (in square), black arrows indicating three marginal teeth (in circle) B maxillule, inset showing enlarged second element on outer lobe C intercoxal sclerite on P1, black arrows indicating ornamentation with long, fine setule, inset showing enlarged setules D posterior part of genital double-somite and postgenital somites showing undulate hyaline frill. Spinoncaea ivlevi (Shmeleva, 1966), male (northwestern equatorial Pacific) E caudal ramus seta II, inset showing enlarged seta II ornamented with a single long spinule.

  Part of: Cho K, Park C, Böttger-Schnack R (2021) Taxonomy of three species of the genus Spinoncaea (Copepoda, Oncaeidae) in the North Pacific Ocean with focus on morphological variability. ZooKeys 1043: 147-191. https://doi.org/10.3897/zookeys.1043.64438