Protrusion like the horn of Nannophya pygmaea

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Nannophya pygmaea is the smallest dragonfly in Japan.　However, the egg is not so small. There is a small protrusion like the horn in the head of this dragonfly.

Female	Male

Hatching

1：Egg   2：Prolarva begins to appear from the egg　　3：Prolarva    4,6,7,8,9：First instar larva appears from the prolarva (Protrusion like the horn appears in this time)　　10,11：First instar larva 　5：Protrusion like the horn of the head　(The size of 4 times of other images)