zophobas morio anatomy

[zxneon]

I have question about zophobas morio larva . What are those stringy bits inside exuvia ? Those go in all length of larva . like in this picture . Sometimes i see (seen only couple times) stringy bit sticking out from larva emm behind . i`m almost sure that is not parasite what sticks out . It looks just like those strings in exuvia and is not moving. and there is no deaths in my worm bin at all . What are those stringy things ? . Picture is not mine , but it is same stuff what i see in exuvia . In one facebook group i was told that it can be trachea . Then why larva drops it in exuvia . And even better question why it trys to poop it out .