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The Vermetidae, the worm snails or worm shells, are a taxonomic family of small to medium-sized sea snails, marine gastropod molluscs in the clade Littorinimorpha. [1] The shells of species in the family Vermetidae are extremely irregular, and do not resemble the average snail shell, hence the common name "worm shells" or "worm snails".
The carapace of Calcinus tubularis is bluish, with many red spots, and extends forwards as a short, triangular rostrum. [4] The eyestalks are white with similar red spotting, as is the last segment of each of the walking legs, and both the fixed and movable fingers of the claws. [4]
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This list of marine gastropod genera in the fossil record is an attempt to list all the genera of sea snails or marine gastropod mollusks which have been found in the fossil record. Nearly all of these are genera of shelled forms, since it is relatively rare for gastropods without a shell ( sea slugs ) to leave any recognizable traces.
SEM image of lateral view of a love dart of the land snail Monachoides vicinus.The scale bar is 500 μm (0.5 mm). Drawing showing a side view of the love dart of the snail Helix pomatia. 1 = flared base of the dart. 2 = position of the inner cavity. 3 = longitudinal flanges or vanes. 4 = sharp tip or blade of the dart A love dart from Cornu aspersum (garden snail) on a ruler for comparison ...
Leucochloridium variae, the brown-banded broodsac, is a species of trematode whose life cycle involves the alternate parasitic infection of certain species of snail and bird. While there is no external evidence of the worm's existence within the bird host, the infection of the snail host is visible when its eye stalks become grotesquely ...
Neritimorpha is a clade of gastropod molluscs that contains around 2,000 extant species of sea snails, limpets, freshwater snails, land snails and slugs. [1] This clade used to be known as the superorder Neritopsina .
Janthina globosa, commonly referred to as the violet snail, is a neustonic organism characterized by its thin, fragile purple shell and large size The maximum recorded shell length is 38.5 mm. [2] Females normally grow to larger sizes than males, making it easy to distinguish between the sexes.