Fine structural indications of an osmoregulatory function of the "gills" in terrestrial isopods (Crustacea, Oniscoidea).

In all species of Oniscoidea investigated the epithelial cells of the "gills" (= eodopodites of pleopods) show the ultrastructural organization of transporting epithelia. Therefore it is assumed that also in the terrestrial isopods the pleopods are involved in respiration as well as osmoregulation.

[Studies on the rectal pads of the honey bee Apis mellifca]. / Untersuchungen an Rektalpolstern der Honigbiene Apis mellifica

According to earlier investigations young bees show a rectal fluid hypo-osmotic to the haemolymph. It had been assumed, however, that in certain situations honey bees have to be economical with water and simultaneously form a rectal fluid hyperosmotic to the haemolymph. The latter has been confirmed by the present investigation.