Mollusk

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Molluscs
Caribbean Reef Squid
Caribbean Reef Squid, Sepioteuthis sepioidea
Scientific classification
Kingdom: Animalia
Subkingdom: Metazoa
Branch: Bilateria
Superphylum: Protostomia
Phylum: Mollusca
Linnaeus, 1758
Classes

Caudofoveata
Aplacophora
Polyplacophora
Monoplacophora
Bivalvia
Scaphopoda
Gastropoda
Cephalopoda
† Rostroconchia
† Helcionelloida

The mollusks (American spelling) or molluscs (British spelling) are the large and diverse phylum (Mollusca) of invertebrates that includes a variety of familiar animals well-known for their decorative shells or as seafood. These range from tiny snails, clams, and abalone to the octopus, cuttlefish, and squid (which have complex nervous systems and are considered the most intelligent invertebrates).

Mollusks are characterized by having a true coelom; a body divided into the three parts of head, visceral mass, and muscular foot; organ systems for circulation, respiration, digestion, excretion, nerve conduction, and reproduction; and most mollusks have one or more shells and are bilaterially symmetrical (Towle 1989).

With more than 100,000 recognized species (Feldkamp 2002), mollusks are the second most diverse animal phyla after Arthropoda. The giant squid, which until recently had not been observed alive in its adult form, is the largest invertebrate although it is likely that the Colossal Squid is even larger.

The term mollusk comes from a Latin term meaning "soft," referring to the bodies of these invertebrates, although most have a shell covering. Octopuses, squids, and slugs lack such a shell. The scientific study of mollusks is called malacology.

Anatomy

Mollusks are triploblastic (having three primary germ layers: the ectoderm, mesoderm, and endoderm) protostomes. The principal body cavity is a blood-filled hemocoel. They have a true coelom (eucoelom); any coelomic cavities have been reduced to vestiges around the hearts, gonads, and metanephridia (kidney-like organs). The body is often divided into a head, with eyes or tentacles, a muscular foot and a visceral mass housing the organs.

Mollusks have a mantle, which is a fold of the outer skin lining the shell, and a muscular foot that is used for motion. Many mollusks have their mantle produce a calcium carbonate external shell and their gill extracts oxygen from the water and disposes waste. All species of the phylum Mollusca have a complete digestive tract that starts from the mouth to the anus. Many have a feeding structure, the radula, mostly composed of chitin. Radulae are diverse within the Mollusca, ranging from structures used to scrape algae off rocks, to the harpoon-like structures of cone snails. Cephalopods (squid, octopodes, cuttlefish) also possess a chitinous beak. Unlike the closely related annelids, mollusks lack body segmentation.

Development passes through one or two trochophore stages, one of which (the veliger) is unique to the group. These suggest a close relationship between the mollusks and various other protostomes, notably the Annelids.

Mollusk fossils are some of the best known and are found from the Cambrian onwards. The oldest fossil seems to be Odontogriphus omalus, found in the Burgess Shale. It lived about 500 millions years ago.

Classification

There are nine classes of mollusks, eight still living and one known only from fossils. These classes make up the 250,000 and more species of mollusk:

  • Class Caudofoveata (deep-sea wormlike creatures; 70 known species); now generally recognized as a subclass of Aplacophora.
  • Class Aplacophora (solenogasters, deep-sea wormlike creatures; 250 species)
  • Class Polyplacophora (chitons; 600 species, rocky marine shorelines)
  • Class Monoplacophora (deep-sea limpet-like creatures; 11 living species)
  • Class Bivalvia (also Pelecypoda) (clams, oysters, scallops, mussels; 8,000 species)
  • Class Scaphopoda (tusk shells; 350 species, all marine)
  • Class Gastropoda (nudibranchs, snails and slugs, limpets, sea hares; sea angel, sea butterfly, sea lemon; estimated 40,000 - 150,000 species)
  • Class Cephalopoda (squid, octopodes, nautilus, cuttlefish; 786 species, all marine)
  • Class † Rostroconchia (fossils; probably more than 1,000 species; probable ancestors of bivalves)
  • Class † Helcionelloida (fossils; snail-like creatures such as Latouchella)

Main article: Evolution of Mollusca

                 Caudofoveata (?)
                 Aplacophora
hypothetical                     Polyplacophora
ancestral                Monoplacophora
mollusk                   Gastropoda
                    Cephalopoda
                    Bivalvia
                    Scaphopoda

Brusca & Brusca (1990) suggest that the bivalves and scaphopods are sister groups, as are the gastropods and cephalopods, so indicated in the relationship diagram above.

In this phylum's level of organization, organ systems from all three primary germ layers can be found:

  1. Nervous System (with brain).
  2. Excretory System (nephridium or nephridia).
  3. Circulatory System (open circulatory system).
  4. Respiratory System (gills or lungs).

All major molluscan groups possess a skeleton, though it has been lost evolutionarily in some members of the phylum. It is probable that the pre-Cambrian ancestor of the mollusks had calcium carbonate spicules embedded in its mantle and outer tissues, as is the case in some modern members. The skeleton, if present, is primarily external and composed of calcium carbonate (aragonite or calcite). The snail or gastropod shell is perhaps the best known molluscan shell, but many pulmonate and opistrobranch snails have internalized or altogether lost the shell secondarily. The bivalve or clam shell consists of two pieces (valves), articulated by muscles and an elastic hinge. The cephalopod shell was ancestrally external and chambered, as exemplified by the ammonites and nautiloids, and still possessed by Nautilus today. Other cephalopods, such as cuttlefish, have internalized the shell, the squid have mostly organic chitinous internal shells, and the octopods have lost the shell altogether.

See also

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  • Important publications on mollusks

References
ISBN links support NWE through referral fees

  • Brusca & Brusca (1990). Invertebrates. Sunderland, Mass.: Sinauer Associates. 
  • Starr & Taggart (2002). Biology: The Unity and Diversity of Life. Pacific Grove, California: Thomson Learning. 
  • Feldkamp, Susan (2002). Modern Biology. United States: Holt, Rinehart, and Winston. pp. 725</ref>

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