Pages
pp. 117 -
139

On the basis of the molecular sequences of 12S r-RNA gene of 16 species of Costellariidae the phylogenetic hypothesis is proposed. The anatomy of the foregut and radula of 15 species of the family was studied. The anterior foregut is the most rich in phylogenetically informative characters in Costellariidae and Neogastropoda in general. 6 types of anatomy of the mid-oesophagus have been recognized. They differ in the anatomy of the gland of Leiblein and in the presence/absence and state of development of the glandular tube, formed by stripping off and closure of the glandular folds of mid-oesophagus. On the basis of molecular phylogeny it was demonstrated that the most basal underived type of anterior foregut was found in still unnamed species of the family. It is characterized by unmodified gland of Leiblein opening directly into glandular mid-oesophagus. It is proved that the process of the formation of the glandular tube and transformation of the gland of Leiblein into muscular organ occurred in Costellariidae independently from other lineages of Neogastropoda. The functional morphology of the digestive system is discussed. The most probable source of toxins in costellariids is despite expectations not the gland of Leiblein, but accessory or primary salivary glands.

Эволюция хищных брюхоногих моллюсков семейства Costellariidae (Neogastropoda) в рамках молекулярной филогении
Федосов А.Э.; Кантор Ю.И.;