Neo- Rudenine gatve
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- Published: 2009-09-23
- Uploaded: 2011-01-31
- Author: MENULIScom
NEO- Rudeninė Gatvė
The Neogastropoda was, for many years, an order of sea snails, marine gastropod mollusks. In the current version of gastropod taxonomy however, Neogastropoda is an unranked clade of sea snails.
The shell has a well-developed siphonal canal. The elongated trunk-like siphon is an extensible tube, formed from a fold in the mantle. It is used to suck water into the mantle cavity. At the base of the siphon is the bipectinate (branching from a central axis) osphradium, a sensory receptacle and olfactory organ, that is more developed than the one in the Mesogastropoda. They achieved important morphological changes including e.g., the elongation of the siphonal canal, a shift in the mouth opening to a terminal position on the head, and the formation of a well-developed proboscis. Neogastropoda have been considered a natural group, clearly differentiated from other Caenogastropoda. or Buccinoidea have been alternatively proposed as the sister group of the remaining Neogastropoda..
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