Rhodnius is an arthropod that can be decapitated and live for up to a year without its head.Prothoracicotropic hormone (PTTH) is a molting hormone that is stored in the head and released after a blood meal.Because of this you would expect that a Rhodnius that is decapitated within an hour of its last blood meal would

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Decapitation of a Rhodnius within an hour of its last blood meal would not result in immediate molting, as the PTTH hormone needed for molting is already stored in the head and not affected by the absence of the rest of the body. The insect would not revert to a more juvenile life stage or molt more frequently than normal. It would simply continue its normal behavior but eventually die without being able to molt, as molting requires the release of PTTH from the head.

Rhodnius Is an Arthropod That Can Be Decapitated and Live