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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 6 - epidermis 7 - 8 - nerve of an tentacle 9 - retractor muscle 10 - Well-developed lens eye of Eustrombus gigas on eyestalk has a black iris.
Helix pomatia feeds on live plants [42] [49] as well as dead plant matter. [54] Observations showed preference for some specific plant species [ 49 ] and avoidance of others. [ 42 ] The nettle Urtica dioica is a preffered food plant especially in juveniles. [ 54 ]
Helix pomatia, known as the Roman snail, Burgundy snail, or escargot, is a species of large, air-breathing stylommatophoran land snail native to Europe. It is characterized by a globular brown shell. It is characterized by a globular brown shell.
The upper pair of tentacles on the head of Helix pomatia have eye spots, but the main sensory organs of the snail are sensory receptors for olfaction, situated in the epithelium of the tentacles. Main articles: Sensory organs of gastropods and Nervous system of gastropods
For instance, 10-year old individuals of the Roman snail Helix pomatia are probably not uncommon in natural populations. [27] Populations of some threatened species may be dependent on a pool of such long-lived adults. [28] In captivity, the lifespan of snails can be much longer than in the wild, for instance up to 25 years in H. pomatia. [29]
Tentacles are greenish brown and translucent, but they sometimes have opaque white marks that can form rings, the study said. The creatures have a maroon oral disc that is often circled by a ...
The accepted name of the species was long considered to be Helix aspersa, a member of the genus Helix, like the Roman snail Helix pomatia. However, in a number of publications since 1990, [ 6 ] it has instead been placed in various genera previously considered as subgenera of Helix .
VD = vas deferens Head of a mating Helix pomatia showing the everted penis (P), and the dart sac (S) in the process of shooting a love dart (D). Head of Helix pomatia after mating with everted vagina (V) and penis (P). Pulmonate land gastropods are simultaneous hermaphrodites and their reproductive system is complex. It is all completely ...