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An old empty shell of Megastraea undosa, wedged under a rock and covered in the pink coralline alga Lithothamnion, which has cemented it to the substrate.. Megastraea undosa, common name the wavy turban snail, is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails. [2]
apertural view of the shell of Arianta arbustorum (top left); lateral view (top right); apical view (bottom left) and umbilical view (bottom right). The shell is usually brown with numerous pale yellowish rows of spots and usually with a brown band above the periphery, occasionally yellowish, reddish or with greenish hue, weakly striated and with fine spiral lines on the upper side. [4]
At full sexual maturity the snail is a simultaneous hermaphrodite. [5] They can live for a little over one to three years and will start reproducing at 6 months old or approximately 12-17 mm in length. [4] Most reproduction takes place in the spring within their native range. [5] The normal diet is dead and decaying plant matter.
These snails eat dead plant and animal matter and various other detritus. Because Physella acuta forages mainly on epiphytic vegetation and on the macrophytes, whereas other gastropods (Planorbis planorbis, Radix ovata) exploit the algal cover or phytobentos on the bottom, competition between Physella acuta and other gastropods appears to be ...
Snail densities were reduced by 80-90% on the oil covered salt marsh edges and 50% in the marsh interior. [13] The major loss of adult snails resulted in a reduced mean snail size in salt marshes. It was originally projected that it would take about 3–5 years for the L. irrorata population density to recover from the oil spill. [ 13 ]
The greater Bermuda land snail was thought to have vanished from the planet.
The reason why this happens only to mature snails is not yet known, but one hypothesis is that a mature snail will excrete a signal substance which attracts the P. ciliata larvae. Another hypothesis is that a mature snail has a change in the shell surface that makes it suitable for P. ciliata larvae to settle. The infection by this parasite ...
The zebra nerite snail is frequently sold to aquarists. These specimens are typically wild caught, since the snail is difficult to breed in captivity. This snail is typically sold as an algae eater as it will constantly scrape the glass, hardscape and substrate of the aquarium for algae with its rasping mouth. They are capable of surviving in ...