Marinus Hoogmoed, a former colleague in Leiden and calling himself proudly “an old, traditional herpetologist” (i.e. still studying morphology), kindly sent me these photographs of two snails in copulation. He found them in disturbed rainforest in the Serra Sul de Carajas (700 km S Belém).
While I have rarely seen photographs from snails copulating under field conditions, these pictures are (perhaps?) a rare find. They are from a red-lipped Megalobulimus species, but since several are reported from that part of Brazil, it may be difficult to pinpoint a species name to them.
Many thanks Marinus, and proudly continue with your good work!