[The structural organization of the receptor elements and organs of the land mollusk Pomatia elegans (Prosobranchia)].

The general structural organization, receptor and nervous elements of tentacular sensory organs, statocysts, eyes, osphradium as well as receptor elements of skin of body and head were investigated in the land prosobranch mollusk Pomatias elegans. The structure of eyes, statocysts and osphradium of P. elegans, with the exception of some details, does not differ principally from the structure of corresponding sensory organs of the primarily water-dwelling Prosobranchia. The head tentacles are complex, specialized sensory formations, similar to tentacular organs of land pulmonates. They had a specialized sensory area, featured in the apex of the tentacle, and apical and basal tentacular ganglia. The glomerula-like formations are revealed in the neuropile of the apical tentacular ganglion. Almost all the receptor cells in skin and sensory organs of P. elegans are intra-epithelial. The regularities of evolution of chemosensory systems of gastropods arising at multiple land intrusion are discussed.