Morphology of the jaw apparatus in 8 species of Patellogastropoda (Mollusca, Gastropoda) with special reference to Testudinalia tesulata (Lottiidae)статья
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Аннотация:The fine structure of the jaw apparatus was
studied by scanning electron microscopy in eight species of
Patellogastropoda. The jaw apparatus is an unpaired twolayered
dorsolateral structure with anterior and posterior
wings attached to the odontophore by muscles. The jaw of
Testudinalia tesulata (O.F. Mu¨ ller, 1776) is a derivative of
the cuticle typical for the foregut. The tissue forming the
jaw is a specialized foregut epithelium (gnathoepithelium),
consisting of a special type of cells called gnathoblasts.
The jaw grows in areas of the epithelium characterized by
high concentration of electron-dense vesicles, ER and long
microvilli that penetrate deep into the jaw plate. This
indicates that the gnathoblasts take an active part in jaw
growth. In most cases, these areas of the gnathoepithelium
are highly folded. The main differences between the species
studied are form and thickness of the frontal edge of
the jaw. These differences do not correlate with the systematic
position of the species studied but likely depend
more on the feeding mode. The transmission electron
microscopy studies yielded new morphological criteria for
comparison between various gastropod species and other
members of Trochozoa, in particular, Annelida. The jaws
of Annelida are cuticular structures formed on the surface
of specialized epithelial cells, often also called gnathoblasts.
The jaw of Patellogastropoda can be attributed to
the first type of annelid jaw formation characterized by an
epithelium with long microvilli and continuous growth.