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Eye of a snail. 1 - anterior chamber, 2 - lens, 3 - retina, 4 - optic nerve. Drawing of cross section of the eye of Helix pomatia. 1 - lens 2 - olfactory epithelium 3 - corneal epithelium 4 - corneal endothelium 5 - retina 6 - layer with rod cells 7 - fibrous connective tissue layer 8 - nerve of the eye
In terrestrial gastropods (land snails and slugs), the olfactory organs, located on the tips of the four tentacles, are the most important sensory organ. [23] The chemosensory organs of opisthobranch marine gastropods are called rhinophores. The majority of gastropods have simple visual organs, eye spots either at the tip or base of the
Helix is a genus of large, air-breathing land snails native to the western Palaearctic and characterized by a globular shell. [1] [2]It is the type genus of the family Helicidae, and one of the animal genera described by Carl Linnaeus [3] at the dawn of the zoological nomenclature.
Finally, the nerve cords terminate in a linked pair of visceral ganglia, which supply nerves to the remaining organs of the visceral mass. In air-breathing freshwater snails of the genus Lymnaea Lamarck, 1799 goal-directed decision-making during the hunt for food is performed by just two neuron types.
The ctenidium (a comblike respiratory apparatus) goes along most of the length of the pallial cavity. This respiratory gill consists of 10 to 200 triangular filaments. The osphradium, the olfactory organ linked with the respiration organ, is usually relatively small. The taenioglossate radula consists of more than fifty rows of teeth. The ...
This structure exists in bivalves, cephalopods, polyplacophorans (chitons), and in aquatic gastropods such as freshwater snails and marine snails. [1] Certain molluscs, such as the bivalves, [ 2 ] possess paired ctenidia, but others, such as members of the Ampullariidae , [ 3 ] bear a single ctenidium.
The main function of this organ is disputed but it is believed to be used to test incoming water for silt and possible food particles or, in some species, for sensing the presence of light. It is a popular idea among malacologists that the presence of an osphradium should be a molluscan synapomorphy .
The snail takes 30–40 days to hatch and is then considered young (before sexual maturity). Sexual maturity begins between 4 and 16 months after hatching. The snail is relatively fast moving at about 8 mm/s. [3] The snail has a light grey or brown body, with its lower tentacles being long and almost touching the ground.