Goliathus pupation time

After a number of months, an adult pair of Goliathus has emerged for me.

The funny part is that they emerged a few weeks ago, after forming pupal cells in November 2020. That puts the total pupation time around 8-9 months, which is longer than I have heard elsewhere.

The other interesting part is that I got tired of waiting after about 5 months and made a small hole in the cells, and both were still larvae. They then entered the pupal phase around a month or two after that. 

Both appear to be healthy and normal, and were as larvae too. The only explanation I can think of is temperature, as my bug room is typically between 71-77 degrees, most of the time on the low side.

Has anyone had a similar experience?

 
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