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Common name. Krill.
Description. Head. Rostrum present or absent; eyes stalked; compound, visual elements present; ocular scale absent; naupliar eyes absent. Antennules (antenna 1) biramous; peduncle and flagellum distinct; endopod well developed; exopod well developed, whip-like. Antennae (antenna 2) biramous; exopod forming a scaphocerite. Mandible uniramous; palp present, or absent. Maxillipeds, absent. Thorax. Carapace present, univalved, enclosing head and thorax, laterally compressed, smooth. Thorax and abdomen differentiated. Peraeopods (legs) 8 pairs; biramous; non-phyllopodous; undifferentiated (simple), or differentiated (some prehensile). Abdomen with 6 somites. Epimera present. Pleopods present, 5 pairs; none modified into reproductive organ in males, or pleopod 1 forming a gonopod (eg. petasma) in males. Uropods well developed, 1 pair, positioned ventrolaterally; rami present, exopod with diaresis, partial or complete or exopod without diaresis (partially developed); endopod without statocyst. Telson present (not fused to pleon).
These small crustaceans are important organisms of the zooplankton, particularly as food for baleen whales, mantas, whale sharks, Crabeater seals and other seals, and a few seabird species that feed almost exclusively on them.
Mauchline, J.: Euphausiacea: Adults, Conseil International pour l'Exploration de la Mer, 1971.
Mauchline, J.: Euphausiacea: Larvae, Conseil International pour l'Exploration de la Mer, 1971.
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