It is diagnostic of Pogonognathellus longicornis that this species is able to tightly curl both an4 and ant3 due to their flexible annular structure (c.f. Tomocerus, which is only able to curl ant4 slightly). Frans Jansens made the interesting comment on this photo that this individual is considering jumping and has curled ant4, presumably to avoid damage. This behaviour has not occurred to me before and I need to investigate this further next time I find some curly-wurlys to play with.
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