Myoida (lat.) - a detachment of marine bivalve mollusks from the subclass of Heterodonta . Most of the representatives of this group are drillers cutting through deep passages in the dense bottom soil or in wood immersed in water [2] . Typically, mollusks continue to eat particles suspended in the water, stretching out long siphons toward the exit, and therefore this lifestyle is considered as a form of protection against predators [2] . Representatives of the shipworm family, thanks to the presence of symbiont bacteria, have acquired the ability to feed on cellulose and hemicellulose [2] . Many Myoida are used as human food, some are bred in mariculture.
| Myoida | |||||||||||||||||||||
 Clam pattern with siphon and foot extended | |||||||||||||||||||||
| Scientific classification | |||||||||||||||||||||
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| International scientific name | |||||||||||||||||||||
Myoida Stoliczka , 1870 | |||||||||||||||||||||
| Superfamilies and families [1] | |||||||||||||||||||||
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Content
Building
Representatives of the detachment possess thin shells devoid of a pearlescent layer [2] . The edges of the valves in many species loosely adjoin each other, leaving gaping crevices on the abdominal and siphon edges. The front part of the shell used for drilling often carries additional teeth that increase abrasive properties [2] . The lock apparatus of the sink is represented by 1-2 cardinal teeth (desmodont type of lock), which ensures the relative mobility of the flaps [2] [3] . In shipworms, the shell is greatly reduced in size and encloses only a small part of the body [2] . The leg functions as a suction cup during drilling, allowing the clam to attach to the stroke wall. The edges of the left and right leaves of the mantle grow together almost the entire length, only the holes of the siphons are preserved and, in the front of the abdominal edge, an opening for the leg [2] .
Illustrations
Mya truncata in section of soil
Shipworm Teredo
Corbula modesta ( Corbulidae )
Cyrtopleura costata ( Pholadidae )
See also
- Pholas
Notes
- ↑ Gofas, S. (2011). Myoida in the World Register of Marine Species database. (Retrieved April 29, 2012)
- ↑ 1 2 3 4 5 6 7 8 Ruppert E.E., Fox R.S., Barnes R.D. Lower coelomic animals // Invertebrate Zoology. Functional and Evolutionary Aspects = Invertebrate Zoology: A Functional Evolutionary Approach / Per. from English T. A. Ganf, N. V. Lentsman, E. V. Sabaneeva; under the editorship of A. A. Dobrovolsky and A. I. Granovich. - 7th edition. - M .: Academy, 2008. - T. 2. - S. 192-264. - 448 p. - 3000 copies. - ISBN 978-5-7695-2740-1 .
- ↑ Westheide W. , Rieger R. From protozoa to mollusks and arthropods // Invertebrate Zoology. = Spezielle Zoology. Teil 1: Einzeller und Wirbellose Tiere / Per. with him. O. N. Bölling, S. M. Lyapkova, A. V. Mikheev, O. G. Manylov, A. A. Oskolsky, A. V. Filippova, A. V. Chesunov; under the editorship of A.V. Chesunova. - M .: Partnership of scientific publications of KMK, 2008. - T. 1. - S. 332—342. - iv + 512 + iv s. - 1000 copies. - ISBN 978-5-87317-491-1 .