Morphological Features, Ecology, and Distribution of Poorly Studied Molluscan Genera of the Colinae Subfamily (Gastropoda, Buccinidae) from the Far Eastern Seas of Russia

摘要

Data on the distribution of six genera of poorly studied buccinids of the Colinae subfamily (Neo-gastropoda, Buccinidae), namely, Colus Rbding, 1799; Plicifusus Dall, 1902; Retifusus Dall, 1916; Aulacofusus Dall, 1918; Pararetifusus Kosuge, 1967; and Latisipo Dall, 1916, are presented. These mollusks are widely spread in the North Pacific region dwelling predominantly over loose sediments in a wide range of sea depths. Based on the morphology and contents of their digestive tracts, it is assumed that the representatives of the genera studied are predators with diverse diets. It is supposed that the increase in the dwelling depths had no significant influence on the feeding ecology of the species studied. Meanwhile, the lower abundance of preys at greater depths caused the lower population densities and modifications in the proboscis structure of selected taxa.