The swan mussel has a thin fragile shell. It is found in fresh stationary waters. It has a foot so that it maneuver a bit. There is one known incident of a swan. Descriptions and articles about the Swan Mussel, scientifically known as Anodonta cygnea in the Encyclopedia of Life. Includes Overview; Brief Summary; Distr. Anodonta-cygnea_jpg. Anodonta cygnea. Provided by Welter Schultes, Francisco Locality: Germany: Schleswig-Holstein, Brammer Teich near Kiel.
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Species description A very large bivalve shell anodonga a flattened profile and broad, oblong shape. Views Read Edit View history. Prefers muddy substrate bare of vegetation. Retrieved 23 April Institute of Zoology, Slovak Academy of Sciences.
Embryonal shell finely striated along the growth lines, the lines reach the margin. Its native distribution is European-Siberian. Occasionally found in Spain and Portugal in artificially disturbed habitats, where infected fishes from central Europe were released.
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This page was last edited on 4 Octoberat Home Introduction Selection Criteria:: Nomenclator Zoologicus Neave updated, genera. This species is found in rivers and lakes. Retrieved 4 January In Switzerland in up to m altitude. Retrieved from ” https: It differs from Anodonta anatina in being larger shell with straighter, more parallel dorsal and ventral margins; the growth lines of the inner, oldest part of the shell are finer and shallower, and reach the margin.
Diffuse pollution has affected its habitat in most areas and dissolved oxygen is reduced in many to dangerously low levels in the summer months.
The outlines of shells poking out of the mud can then be seen with the paired pale siphons appearing between the valves. Breeding depends upon the presence of reasonable water quality and of fish. On a still, sunny day after a period of dry weather look down at the lake bottom with Polaroid glasses or using a glass-bottomed box. Malacologica Bohemoslovaca in Czech.
Anodonta cygnea swan mussel :: Northern Ireland’s Priority Species ::
The swan musselAnodonta cygneais a large species of freshwater musselan aquatic bivalve mollusc in the family Unionidaethe river mussels. Similar species The only other large mussel found in still or nearly still waters is the duck mussel Anodonta anatine.
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The geographical distribution of this species is from the British Isles east to Siberia, and south into northern Africa. Anodonta cygnea Linnaeus The parasitic larvae are called glochidia and are produced in spring and carried by the current until they contact a bottom-living fish.
From Wikipedia, the free encyclopedia. The shell is thin and pale, whitish or pearly inside due to a thin layer of nacre, but protected by a periostracum outside which gives it a smooth, glossy brown, sometimes green appearance marked with strong concentric growth lines.
The dorsal upper margin usually lies at an acute angle to the line of the ventral lower margin giving the shell a distinct wedge shape, instead of being almost parallel as in the swan mussel which produces a more oblong shape.
Archived from the original on 19 October It can reach mm 6 in in size and has a nearly straight dorsal upper or hinge margin with a drawn out posterior end and slightly rounded to nearly straight ventral lower margin. List of failure reports.
Tolerates eutrophic conditions, but not ctgnea the last toxic stadium. Unionidae The swan mussel is a very large bivalve mollusc which lives in streams, rivers and along lakeshores where the bottom is of rich mud or silt and relatively free of plant growth. Shell yellowish or greenish brown, thin, not very solid, ligament long and narrow, without teeth, lower side of frontal interior margin not thickened.
The swan mussel is a very large bivalve mollusc which lives in streams, rivers and along cugnea where the bottom is of rich mud or silt and relatively anodontw of plant growth. It was formerly common in such places but has been displaced by main drainage schemes in rivers, excess siltation, eutrophication and, recently, by the invasive zebra mussel Dreissena polymorpha.
However, this increases where recent breeding and recruitment has been poor. Lakes, old river arms, artificial lakes, needs silent waters, only rarely in running waters, usually in lowlands. In brief A very large bivalve shell found in silty or muddy backwaters of streams, rivers and lakes Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters A more acute or short-term threat has been delivered by the invasive zebra mussel which competes for dissolved oxygen and food Red listed in Ireland as Vulnerable VU and as a Priority Species in Northern Ireland Species description A very large bivalve shell with a flattened profile and broad, oblong shape.
Host fishes for glochidia are Salmo trutta, Perca fluviatilis, Leuciscus leuciscus, Sander lucioperca and Gasterosteus aculeatus, but not Rhodus sericeus. They will then drop off after a period of weeks and find a suitable place on the bottom to begin an independent life. Click on map to open large map in new window. Archived from the original on anpdonta December