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The Tonnidae are a family of medium-sized to very large sea snails, known as the tun shells. These are marine gastropod molluscs in the clade Littorinimorpha. The name tun refers to the snails' shell shape, which resembles wine casks known as "tuns". While thin, the shells are also strong and lack opercula. They are found in all tropical seas ...
Shells of two different species of sea snail: on the left is the normally sinistral (left-handed) shell of Neptunea angulata, on the right is the normally dextral (right-handed) shell of Neptunea despecta The shell of a large land snail (probably Helix pomatia) with parts broken off to show the interior structure. 1 – umbilicus
Murex is a genus of medium to large sized predatory tropical sea snails.These are carnivorous marine gastropod molluscs in the family Muricidae, commonly called "murexes" or "rock snails".
Muricidae is a large and varied taxonomic family of small to large predatory sea snails, marine gastropod mollusks, commonly known as murex snails or rock snails. With over 1,700 living species, the Muricidae represent almost 10% of the Neogastropoda. Additionally, 1,200 fossil species have been recognized.
Shells of Muricanthus radix can reach a size of 50–160 millimetres (2.0–6.3 in). [2] These large, massive, heavy shells are globose or pear-shaped and very spiny, with a white surface and blackish-brown foliations and spiral elements. The body whorls have six to eleven varices. The aperture is large, broad, ovate and porcelaneous white.
Mancinella armigera Museum specimen Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Subclass: Caenogastropoda Order: Neogastropoda Superfamily: Muricoidea Family: Muricidae Subfamily: Rapaninae Genus: Mancinella Species: M. armigera Binomial name Mancinella armigera Link, 1807 Synonyms Purpura affinis Reeve, 1846 Purpura armigera (Link, 1807 ...
Among snails, moon snails and tower snails can be found. In addition, cnidarians occur. Occasionally crayfish are preserved, as shown by individual shell parts of Lobocarcinus from the group of edible crabs in the Middle Birket-Qarun Formation. The carapaces have widths of 9 to 14 cm, with marked sexual differences in carapace shape.
The anal canal at the posterior end is a deep slot. The strong axial varices are often in two continuous series per whorl, one down each side of the shell. The nucleus of the corneous operculum is situated either at the anterior end or the mid-inner margin. A periostracum (hairy covering of the outer shell) is usually absent or thin.