Volume 29

This paper provides reliable data on the occurrence of bivalve mollusk Neaeromya compressa in the Sea of Japan. Nine alive specimens (L = 5.9–19.2 мм) were collected in June 2003 in Peter the Great Bay (southern Primorye) at the depths of 66–74 m on mud and sand. These are illustrated and described in detail. The data on ecology and geographical range of the species are summarized.

The SEM image and description of the Boucardicus leopardus radula is presented for the first time. The radula appeared morphologically similar to those of representatives of Alycaeidae. At the same time representatives of Boucardicus differ significantly from South-East Asian Alycaeidae. It is suggested, that presently Boucardicus is not monophyletic and includes representatives of different genera and possibly families.

Oospira haivanensis sp. nov, a new member of the Clausiliidae subfamily Phaedusinae is described from the Hai Van Mountain in central Vietnam. The relationship of the new species to other taxa of the genus and  the zoogeographical importance of Oospira species in Southeast Asia are discussed.

The population structure of the terrestrial mollusk Fruticicola fruticum (Gastropoda, Pulmonata, Bradybaenidae) in different landscapes of Eastern Europe on the basis of conchological measurements, including morphometric parameters and color variants was studied. For all morphometric parameters used, statistically significant differences were found between the studied populations. At the same time, the shell size are determined not by zonal characteristics, but by microbiotopic conditions. Changes in the frequency of shell phenotypes in Fr. fruticum populations are probably of a multifactorial nature. The ratio of different color variants can be caused by the influence of radiation, cyclic fluctuations of climatic factors, succession changes in biotopes, and gene drift.