Protrusion like the horn of Sinictinogomphus clavatus
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1：Prolarva begins to appear from the egg 2：Prolarva 3：First instar larva appears from the prolarva 4：First instar larva 5：Protrusion like the horn of the head (The size of 2 times of other images)
Although the protrusion is not found in 2 it is seen a short protrusion in 3.