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 swan musselAnodonta cygneais a large species of freshwater musselan aquatic bivalve mollusc in the family Unionidaethe river mussels.
The outlines of shells poking out of the mud can then be seen with cyggnea paired pale siphons appearing between the valves. Host fishes for glochidia are Salmo trutta, Perca fluviatilis, Leuciscus leuciscus, Sander lucioperca and Gasterosteus aculeatus, but not Rhodus sericeus.
AnimalBase :: Anodonta cygnea species homepage
Show history of this page. In Switzerland in up to m altitude. Archived from the original on 27 December In other projects Wikimedia Commons. Swan mussel Conservation status. This is smaller though still a large shell at mm long but usually with a more distinctly angular shape. 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.
Why is this species a priority in Northern Ireland?
It also has a deeper, less flattened shell with the interior more deeply coated with nacre. This page was last edited on 4 Octoberat Views Read Edit View history. Species description A very large bivalve shell with a flattened profile and broad, oblong shape. Embryonal shell finely striated along the growth lines, the lines reach the margin.
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. Click on map to open large map in new window.
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Lakes, old river arms, artificial lakes, needs silent waters, only rarely in running waters, usually in cygena. Pictures of Anodonta cygnea.
Index Animalium Sherborn, species and genera until The geographical distribution of this species is from the British Isles east to Siberia, and south into northern Africa. Malacologica Bohemoslovaca in Czech. Glochidia are mature in autumn, are released in spring in England and in Italytheir size 0.
IUCN Red List of Threatened Species
The shell color is often pale greenish or brownish. Anodonta cygnea Linnaeus Support environmental schemes aimed at reducing diffuse pollution whether from agricultural sources, from inadequate sewage treatment in towns or from the malfunctioning or failure of septic tanks in rural areas. Wikimedia Commons has media related to Anodonta cygnea.
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.
Artificial lakes are usually reached when infected fishes are brought in, young mussels are rarely dispersed by water birds. Home Introduction Selection Criteria:: They have a strong pungent odor and are used by carp fisherman as bait. 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 anodona nearly straight ventral lower margin.
However, this increases where recent breeding and recruitment has been poor. An annotated list of the land and freshwater Mollusca of Northern Ireland. Putting a valve of the shell cyygnea to strong anoeonta separates these two species. The story may not end there, however, as the zebra mussel infestation is now waning and there is hope that the swan mussel can regain some of the territory lost to its competitor. Its native distribution is European-Siberian.
Similar species The only other large mussel found in still or nearly still cygnwa is the duck mussel Anodonta anatine. They will then drop off after a period of weeks and find a suitable place on the bottom to begin an independent life. Shell yellowish or greenish brown, thin, not very solid, ligament long and narrow, without teeth, lower side of frontal interior margin not thickened.
Down, BT18 0EU; naodonta. Nomenclator Zoologicus Neave updated, genera. 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.
Retrieved 4 January How to see this species Cgynea mussels can sometimes be seen from fishing stands at the margins of lakes with silty or mud bottoms. Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters.
Life cycle Adults are long lived andonta there is nearly always a good proportion of mature shells present in colonies. Prefers muddy substrate bare of vegetation. Breeding depends upon the presence of reasonable water quality and of fish. Conservation of this species Current action Declaration as a Priority Species.