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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Swan mussel shells appear to be of even thickness throughout, whereas duck mussel shells andoonta clearly uneven and much thicker and opaque towards the lower front end of the shell.
Views Read Edit View history. Show history of this page. Similar species The only other large mussel found in still or nearly still waters is the duck mussel Anodonta anatine.
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 cyhnea nearly straight ventral lower margin.
They have a strong pungent odor and are used by carp fisherman as bait. 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. A very large bivalve shell found in silty or muddy backwaters of streams, rivers and lakes.
Artificial lakes are usually reached when infected fishes are brought in, young mussels are rarely dispersed by water birds.
Anodonta cygnea swan mussel :: Northern Ireland’s Priority Species ::
Anodonta cygnea Linnaeus Retrieved 4 January Why is this species a priority in Northern Ireland? This is smaller though still a large shell at cygnfa long but usually with a more distinctly angular shape. How to see this species Swan mussels can sometimes be seen from fishing stands at the margins of naodonta with silty or mud bottoms.
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.
In Switzerland in up to m altitude. 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 anldonta rural areas. Diffuse pollution has affected its habitat in most areas and dissolved oxygen is reduced in many to dangerously low levels in the summer months. Archived from the original on 14 February 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.
WoRMS – World Register of Marine Species – Anodonta cygnea (Linnaeus, )
Index Animalium Sherborn, species and genera until In other projects Wikimedia Commons. Archived from the original on 27 December Occasionally found in Spain and Portugal in artificially disturbed habitats, where infected anodobta from central Europe were released. They will then drop off after a period of weeks and find a suitable place on the bottom to begin an independent life.
Wikimedia Commons has media related to Anodonta cygnea.
However, this increases where recent breeding and recruitment has been poor. Unionidae Anofonta 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.
Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters.
Home Introduction Selection Criteria:: 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. Pictures of Anodonta cygnea. Prefers muddy substrate bare of vegetation.
Threatened by continuous destruction of habitats, water current regulations, exaggerated pollution by fertilizers, also by natural drying out of waters. A more acute or short-term threat has been delivered by the invasive zebra mussel which competes for dissolved oxygen and food. 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 anodojta Dreissena polymorpha.