What does molluscs mean?

Definitions for molluscs
mol·luscs

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  1. Molluscs

    The molluscs or mollusks, compose the large phylum of invertebrate animals known as the phylum Mollusca. Around 85,000 extant species of molluscs are recognized. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. They are highly diverse, not only in size and in anatomical structure, but also in behaviour and in habitat. The phylum is typically divided into 9 or 10 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish and octopus, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species. The gastropods are by far the most numerous molluscs in terms of classified species, and account for 80% of the total. The scientific study of molluscs is known as malacology. Molluscs have such a varied range of body structures, it is difficult to find defining characteristics to apply to all modern groups. The two most universal features are a mantle with a significant cavity used for breathing and excretion, and the structure of the nervous system. As a result of this wide diversity, many textbooks base their descriptions on a hypothetical "generalized mollusc". This has a single, "limpet-like" shell on top, which is made of proteins and chitin reinforced with calcium carbonate, and is secreted by a mantle covering the whole upper surface. The underside of the animal consists of a single muscular "foot". Although molluscs are coelomates, the coelom is very small, and the main body cavity is a hemocoel through which blood circulates; their circulatory systems are mainly open. The "generalized" mollusc's feeding system consists of a rasping "tongue", the radula, and a complex digestive system in which exuded mucus and microscopic, muscle-powered "hairs" called cilia play various important roles. The "generalized mollusc" has two paired nerve cords, or three in bivalves. The brain, in species that have one, encircles the esophagus. Most molluscs have eyes, and all have sensors to detect chemicals, vibrations, and touch. The simplest type of molluscan reproductive system relies on external fertilization, but more complex variations occur. All produce eggs, from which may emerge trochophore larvae, more complex veliger larvae, or miniature adults.

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Numerology

  1. Chaldean Numerology

    The numerical value of molluscs in Chaldean Numerology is: 5

  2. Pythagorean Numerology

    The numerical value of molluscs in Pythagorean Numerology is: 6

Examples of molluscs in a Sentence

  1. Van Dalen:

    After the body is placed in the tomb, there are constant events and activities, that is to say, their descendants keep coming back over many years and placing food and offerings there, including molluscs.

Images & Illustrations of molluscs

  1. molluscsmolluscsmolluscsmolluscsmolluscs

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    being essentially equal to something
    • A. incumbent
    • B. equivalent
    • C. appellative
    • D. epidemic

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