ANODONTA CYGNEA PDF
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 with a flattened profile and broad, oblong shape.
The geographical distribution of this species is from the British Isles east to Siberia, and south into northern Africa. From Wikipedia, the free encyclopedia. Down, BT18 0EU; cedar. 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.
The swan musselAnodonta cygneais a large anoconta of freshwater musselan aquatic bivalve mollusc in the family Unionidaethe river mussels. Archived from the original on 14 February Lakes, old river arms, artificial lakes, needs silent waters, only rarely in running waters, usually in lowlands.
A very large bivalve shell found in silty or muddy backwaters of streams, rivers and lakes. Retrieved from ” https: The dorsal upper margin usually lies at an acute angle to the line of the ventral lower margin giving the shell a ajodonta wedge shape, instead of being almost parallel as in the swan mussel which produces a more oblong shape.
Institute of Zoology, Slovak Academy of Sciences. Because of its morphological variability and its wide range of distribution, there are over synonyms for this species.
Swan mussel – Wikipedia
In Switzerland in up to m altitude. An annotated list of the land and freshwater Mollusca of Northern Ireland.
They have a strong pungent odor and are used by carp fisherman as bait. The outlines of shells poking out of the mud can then be seen with the paired pale siphons appearing between the valves.
Retrieved 23 April List of failure reports. Diffuse pollution has affected its habitat in most areas and dissolved oxygen is reduced in many to dangerously low levels in the summer months. Show history of this page. However, this increases where recent breeding and recruitment has been poor. Similar species The only other large mussel found in still or nearly still waters is anoeonta duck mussel Anodonta anatine.
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. Swan mussel Conservation status. Tolerates eutrophic conditions, but not in the last toxic stadium. Archived cggnea the original on 19 October The shell color is often pale greenish or brownish.
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.