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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: Drawing of cross sections of the extracted tentacle (left) and constricted tentacle (right) with and eye of Helix pomatia. 1 - nerve of an eye 2 - 3 - 4 - eye 5 - tentacle ganglion ...
The snail extends the tentacles by internal pressure of body fluids, and retracts all four tentacles into the head by invagination when threatened or otherwise retreating into its shell. The mouth is located beneath the tentacles, and contains a chitinous radula with which the snail scrapes and manipulates food particles.
Pulmonate land snails usually have two sets of tentacles on their head: the upper pair have an eye at the end; the lower pair are for olfaction. [1]In anatomy, an eyestalk (sometimes spelled eye stalk and also known as an ommatophore) is a protrusion that extends an eye away from the body, giving the eye a better field of view. [1]
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 .
This list of reptiles of Texas includes the snakes, lizards, crocodilians, and turtles native to the U.S. state of Texas.. Texas has a large range of habitats, from swamps, coastal marshes and pine forests in the east, rocky hills and limestone karst in the center, desert in the south and west, mountains in the far west, and grassland prairie in the north.
There is a common spermoviduct, but then the male and female tracts divide and the male and female parts have widely separated openings. A free-swiming veliger larva is found in marine species of Ochidiidae, otherwise the development is direct. [27] [24] [28] Stylommatophora is the most diverse group of land snails and slugs.
Each polyp has eight tentacles, the study’s lead co-author Yuka Kushida told McClatchy News over email. Overall, the gnome sea pen has 328 tentacles. Several close-up photos show a diagram of ...
Malacologist Henry A. Pilsbry claimed that snails in mountainous or rocky regions tend to have more angular and heavily ribbed shells while snails in lowland areas are more rounded and smooth. [5] [4] Flamed tigersnails have two pairs of tentacles with eyes on the tips of the upper tentacles (or eyestalks). The body can range from a grayish ...