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].
(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].

Crustacea glossary. . 2011.

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