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The Limidae or file shells are members of the only family of bivalve molluscs in the order Limida. [1] The family includes 130 living species, assigned to 10 genera . Widely distributed in all seas from shallow to deep waters, the species are usually epifaunal or nestling, with many species building byssal nests for protection.
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The length of the shell can vary between 30 mm and 135 mm. [6] The flesh-colored shell is angularly marked with some large, and many small, crowded, deep chestnut lines. The fasciole is tinged with violet, with chestnut maculations.
Explore the unique group of single-celled algae with two flagella and distinct surface grooves, known as dinoflagellates.
The height of the shell varies between 10 mm and 20 mm. The pointed, imperforate, solid shell has an elongated conic shape. It is polished, yellowish, pink, or olive-green, with reddish or olive longitudinal lines in pairs, sometimes separate on the body whorl, and usually with numerous narrow, rather obscure spiral pink or yellowish lines.
Cercozoa (now synonymised with Filosa) [2] is a phylum of diverse single-celled eukaryotes. [4] [5] They lack shared morphological characteristics at the microscopic level, [6] and are instead united by molecular phylogenies of rRNA and actin or polyubiquitin. [7]
Patellogastropoda have flattened, cone-shaped shells, and the majority of species are commonly found adhering strongly to rocks or other hard substrates. Many limpet shells are covered in microscopic growths of green marine algae, which can make them even harder to see, as they can closely resemble the rock surface itself. [citation needed]
Their slender shell is elongated with a pointed spire. They vary in size from 3 mm (Bittium alternatum) to 150 mm (Cerithium nodulosum). The smallest shells are found in the subfamily Bittiinae. The many whorls have radial sculpture with axial ridges and nodules. The aperture shows at its base a vague curve or a distinct siphonal canal.