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Some writers believe that onycha was Unguis odoratus, the fingernail-like operculum, or trap door, of certain sea snails, such as Strombus lentiginosus, Murex anguliferus, and Onyx marinus. It may be the operculum of a snail-like mollusk found in the Red Sea. [4] This operculum is the trap door of a shell, called by the Latins Conchylium.
Shell of marine snail Lunella torquata with the calcareous operculum in place Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place. An operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also ...
Produce that is referred to today as onycha is diverse, including labdanum, benzoin, bdellium, operculum, etc. Each of these products are only referred to as onycha simply because of those who believe the product was the original onycha of antiquity. I have taken the liberty to expand the description of onycha.
Onycha, which in Greek means "nail", is variously described as being the operculum from a shell found in the Red Sea (which are said to resemble a fingernail), the exudation from the rock rose bush called labdanum (both petals and markings which are said to resemble a fingernail), Styrax benzoin, bdellium, or even cloves.
A bony flap that covers the gills; another name for the operculum. gill filaments A series of projections along the posterior edge of the gill arch, the site of gas exchange. gill membranes Membranes covering the gill openings, attached to the branchiostegals. gill opening The opening behind each operculum, leading to the gills. gill rakers
Operculum (animal), a structure resembling a lid or a small door that opens and closes; Operculum (bird), a structure which covers the nares of some birds; Operculum (bryozoa), a lid on the orifice of some bryozoans; Operculum (fish), a flap covering the gills of bony fish; Operculum (gastropod), a sort of trapdoor used to close the aperture of ...
The Aciculidae are a family of small land snails that have opercula (an operculum is a little door that closes the shell when the animal retracts into it). In other words, Aciculidae are terrestrial operculate gastropods.
Determining whether some gastropods should be called sea snails is not always easy. Some species that live in brackish water (such as certain neritids) can be listed as either freshwater snails or marine snails, and some species that live at or just above the high tide level (for example, species in the genus Truncatella) are sometimes considered to be sea snails and sometimes listed as land ...