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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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.
However, this increases where recent breeding and recruitment has been poor. Tolerates eutrophic conditions, but not in the last toxic stadium. They will then drop off after a period of weeks and find a suitable place on cgynea bottom to begin an independent life.
Anodonta cygnea Linnaeus How to see this species Swan mussels can sometimes be seen from fishing stands at the margins of lakes with silty or mud bottoms.
Support environmental schemes aimed at reducing diffuse pollution whether from agricultural sources, from inadequate sewage treatment in towns or naodonta the malfunctioning or failure of septic tanks in rural areas. As settlement increases, the filtration activity of the zebra mussels competes with that of the swan mussel which either suffers respiratory failure or starvation. The Swedish Museum of Natural History.
Index Animalium Sherborn, species and genera until Similar species The only other large mussel found in still or nearly still waters is the duck mussel Anodonta anatine. This mussel is associated with relatively unpolluted slow streams and lakes with mud or silt bottoms, habitats which are in universal decline.
Anodonta cygnea swan mussel :: Northern Ireland’s Priority Species ::
A very large bivalve shell found in silty or muddy backwaters of streams, rivers and lakes. 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.
Archived from the original on 14 February Archived from the original on 19 October Occasionally found in Spain and Portugal in artificially disturbed habitats, where infected fishes from central Europe were released. Retrieved from ” https: List of failure reports. Because of its morphological variability and its wide range of distribution, there are over synonyms for this species.
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.
Swan mussel
Cygnda a valve of the shell up to strong light separates these two species. Click on map to open large map in new window. List of all species. It differs from Anodonta anatina in being larger anodontw 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.
Life cycle Adults are long lived and there is nearly always a good proportion of mature shells present in colonies. Wikimedia Commons has media related to Anodonta cygnea.
Views Read Edit View history. Down, BT18 0EU; cedar. The outlines of shells poking out of the mud can then be seen with the paired pale siphons appearing between the valves.
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Nomenclator Zoologicus Neave updated, genera. From Wikipedia, the free encyclopedia. The geographical distribution of this species is from the British Isles east to Siberia, and south into northern Africa.
Swan mussel – Wikipedia
This is smaller though still a large shell at mm long but usually with a more distinctly angular shape. Retrieved 23 April 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.
Home Introduction Selection Criteria:: Swan mussel shells appear to be of even thickness throughout, whereas duck mussel shells are clearly uneven and much thicker and opaque towards the lower front end of the shell. Malacologica Bohemoslovaca in Czech. Glochidia are mature in autumn, are released in spring in England and in Italytheir size 0.

Species description A very large bivalve shell with a flattened profile and broad, oblong shape. They have a strong pungent odor and are used anodnota carp fisherman as bait.
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The dorsal upper margin usually lies at an acute angle ajodonta 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.
Diffuse pollution has affected its habitat in most areas and dissolved oxygen is reduced in many to dangerously low levels in the summer months. Prefers muddy substrate bare of vegetation. 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 andonta.
Zebra mussels are unable to colonise streams where water flow is significant and it is thought that these streams may act as reservoirs of native mussels which will assist in re-colonisation. In this way large beds of swan mussel along the Shannon and Erne River systems have perished and enormous numbers of empty shells cast ashore. In Switzerland in up to m altitude. Artificial lakes are usually reached when infected fishes are brought in, young mussels cygnnea rarely dispersed by water birds.
The zebra mussel impacts swan mussels indirectly, by settling on their shells which provide the only hard substrate in many waterways. Conservation of this species Current action Declaration as a Priority Species. Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters.
