First ultrastructural study of the formation of the hypodermic radula teeth of Conus (Neogastropoda: Conidae)

Vortsepneva, E.; Tzetlin, A.; Kantor, Y.

Авторы: Vortsepneva E., Tzetlin A., Kantor Y.
Журнал: Journal of Molluscan Studies
Том: 85
Год издания: 2019
Издательство: Oxford University Press
Местоположение издательства: United Kingdom
Первая страница: 184
Последняя страница: 196
DOI: 10.1093/mollus/eyz010
Аннотация: The morphology of the headfoot, foregut, radular sac, teeth and tooth formation of Conus pulicarius were studied using light and electron microscopy, as well as 3D-reconstruction techniques. The anterior digest- ive system of C. pulicarius is similar to that of other studied cone snails, consisting of a proboscis with numerous retractors, single salivary gland with paired ducts, accessory salivary gland, massive venom gland with very large elongate and fusiform muscular bulb and radular sac. The radular sac is divided by a nar- row waist into long and short curving arms with a long duct leading to the oesophagus. The hypodermic teeth (marginal radular teeth) of C. pulicarius are similar to those of other vermivorous species. Neither a continuous subradular membrane nor the membranoblasts that secrete it in other Gastropoda were found. The teeth are formed by odontoblasts in the terminal part of the radular sac, appearing first as thin undif- ferentiated semi-enrolled plates, which only attain their final enrolled shape in the third or fourth row. The supraradular epithelium contains numerous bundles of tonofilaments, which presumably play a part in the final shaping of the teeth and alteration of their chemical composition. Epithelial cells of the radular sac were absent inside newly formed teeth, but migrate into the lumen after the anterior shift of the tooth. A ligament connects the tooth bases in the sequential rows in the fully formed part of the radula and is formed by cells morphologically different from odontoblasts. This work on C. pulicarius is the first ultra- structural study of tooth formation in Conus, but largely agrees with an earlier histological description of C. lividus, a species belonging to another subgenus. INTRODUCTION
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First ultrastructural study of the formation of the hypodermic radula teeth of Conus (Neogastropoda: Conidae)статья