Class Bivalvia

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Order Anomalodesmata

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Arcoida

Order Arcoida

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Cardiida

Order Cardiida

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Carditida

Order Carditida

Key features are not set
Euheterodonta

Order Euheterodonta

Key features are not set
Limida

Order Limida

Key features are not set
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Order Lucinoida

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Myoida

Order Myoida

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Mytilida

Order Mytilida

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Nuculanida

Order Nuculanida

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Nuculida

Order Nuculida

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Pectinida

Order Pectinida

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Order Venerida

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Phylum:Mollusca

The Bivalvia, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, comprise a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. They have no head, and they also lack a radula. Bivalves include clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. A few bore into wood, clay or stone and live inside these substances. Some bivalves, such as the scallops, can swim.

The shell of a bivalve is composed of calcium carbonate, and consists of two, usually similar, parts called valves. These are joined together along one edge (the hinge line) by a flexible ligament that, usually in conjunction with interlocking "teeth" on each of the valves, forms the hinge. This arrangement allows the shell to be opened and closed without the two halves becoming disarticulated. The shell is typically bilaterally symmetrical, with the hinge lying in the sagittal plane. Adult shell sizes of bivalves vary from fractions of a millimetre to over a metre in length, but the majority of species do not exceed 10 cm (4 in).

Bivalves have long been a part of the diet of coastal human populations. Oysters were cultured in ponds by the Romans, and mariculture has more recently become an important source of bivalves for food. Modern knowledge of molluscan reproductive cycles has led to the development of hatcheries and new culture techniques. A better understanding of the potential hazards of eating raw or undercooked shellfish has led to improved storage and processing. Pearl oysters (the common name of two very different families in saltwater and freshwater) are the most common source of natural pearls. The shells of bivalves are used in craftwork, and the manufacture of jewellery and buttons. Bivalves have also been used in the biocontrol of pollution.

Bivalves appear in the fossil record first in the early Cambrian more than 500 million years ago. The total number of living species is approximately 9,200. These species are placed within 1,260 genera and 106 families. Marine bivalves (including brackish water and estuarine species) represent about 8,000 species, combined in four subclasses and 99 families with 1,100 genera. The largest recent marine families are Veneridae, with more than 680 species and the Tellinidae and Lucinidae, each with over 500 species. The freshwater bivalves include seven families, the largest of which is the Unionidae, with about 700 species.

1. PhD Zakharov Denis V.

1. PhD Zakharov Denis V.

The project leader

Academic degree: PhD
Occupation: senior scientist
Workplace: Polar Research Institute of Marine Fisheries and Oceanography (PINRO)
Taxonomic group: Gastropoda
E-mail: zakharden@yandex.ru

2. Zimina Olga L.

2. Zimina Olga L.

The project leader

Occupation: scientist
Workplace: Murmansk Marine Biological Institute (MMBI)
Taxonomic group: Malacostraca, Cirripedia, Pycnogonida
E-mail: o.l.zimina@gmail.com

3. PhD Lyubin Pavel Anatolevich

3. PhD Lyubin Pavel Anatolevich

Author of idea

Academic degree: PhD
Workplace: IPEN Tatarian ASSPBOE
Occupation: senior scientist
Taxonomic group:  Mollusca, Gastropoda
E-mail: plubin@mail.ru

6. Manushin Igor Evgenjevich

6. Manushin Igor Evgenjevich

Occupation: scientist
Workplace: Polar Research Institute of Marine Fisheries and Oceanography (PINRO)
Taxonomic groups: Bivalvia, Brachiopoda
E-mail: manushyn@gmail.com

Lazareva Darya Ju.

Lazareva Darya Ju.

Occupation: Reseacher
Workplace:
Polar Research Institute of Marine Fisheries and Oceanography (PINRO)
Taxonomic groups: Bivalvia
E-mail: lada9405@gmail.com

  1. http://www.marinespecies.org/index.php;
  2. http://www.molluscabase.org/;
  3. Huber, M. (2010). Compendium of bivalves. A full-color guide to 3,300 of the world’s marine bivalves. A status on Bivalvia after 250 years of research. Hackenheim: ConchBooks. 901 pp., 1 CD-ROM.;
  4. Антипова Т.В. Распределение, экология, рост и продукция двустворчатых моллюсков Баренцева и Карского морей. Диссертация на соискание ученой степени канд. биолог. наук. Мурманск 1979. 230 с.;
  5. Список видов свободноживущих беспозвоночных евразийских морей и прилежащих глубоководных частей Арктики. В серии: Исследования фауны морей. Вып. 51(59). СПб., 2001. 132 с.;
  6. Филатова З.А.Класс Bivalvia (Lamellibranchiata) - Двустворчатые моллюски. В кн. Определитель фауны и флоры северных морей СССР. М. 1948. С. 405-446.;