| Development of the euphausiid's eggs based on the criteria proposed by Ponomareva (1966) |
| Ponomareva described five development stages of the euphausiid eggs:: Stage I: recently spawned egg; perivitelline space minute; no sign of clevage. Stage II: initial stage of clevage to multicellular blastula Stage III: epiboly; blastula transformed into gastrula Stage IV: embryo transformed into nauplius; naupliar appendages still connected to the body by a membrane. Stage V: Nauplius has taken shape; no membrane' appendages freely suspended from the body' in a live egg the nauplius moves the appendages. Reference Ponomareva LA (1966) Euphausiids of the North Pacific. Their distribution and ecology. Academy of Sciences in the USSR Institute of Oceanology. Translated from Russian. US Department of the interior and the National Science Fundation. 154 pp. |
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| Nauplii I of Thysanoessa spinifera |
| Animation of the development of the eggs of Euphausia pacifica. Development time is not known so far. In this sequence appear Stage I, Polarizarion of the cell during mitosis (Still stage I), two-cells eggg (Stage II), Stage IV (nauplii with appendages attached), and Nauplii hatching from the egg. |
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