Definitions

First larval stage following the nauplius stage in euphausids, corresponding roughly to the the protozoea stage. [Brusca and Brusca, 2002]
Larval stage of euphausiids. There are three successive calyptopes, distinguished by the increasing degree of development of the abdomen. [Mauchline, 1984]
Third larval stage in euphausiaceans, characterized by differentiation of abdomen and appearance of compound eyes. [Moore and McCormick, 1969]
Third larval stage, characterized by differentiation of abdomen and appearance of compound eyes (Euphausiacea); see also zoea. [McLaughlin, 1980]
(Taxon-specific: Order Euphausiacea) Third of several larval stages (nauplius, metanauplius, calyptopis, furcilia). Characterized by development of carapace, elongation of abdomen, differentiation of somites, and development of eyes under carapace.
See: Cyrtopia [Stachowitsch, 1992]