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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Archived from the original on 27 December A very large bivalve shell found in silty or muddy backwaters of streams, rivers and lakes.
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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. The parasitic larvae are called glochidia and are produced in spring and carried by the current until they contact a bottom-living fish. Shell yellowish or greenish brown, thin, not very solid, ligament long and narrow, without teeth, lower side of frontal interior margin not thickened.
The outlines of shells poking out of the mud can then be seen with the paired pale siphons appearing between the valves. Artificial lakes are usually reached when infected fishes are brought in, young mussels are rarely dispersed by water birds. The geographical distribution of this species is from the British Isles east to Siberia, and south into northern Africa.
This page was last edited on 4 Octoberat The zebra mussel impacts swan mussels indirectly, by settling on their shells which provide the only hard substrate in many waterways. 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.
The shell color is often pale greenish or brownish. It also has a deeper, less flattened shell with the interior more deeply coated with nacre. Swan mussel Conservation status. Archived from the original on 14 February As settlement increases, the filtration activity of the zebra mussels competes with that of the swan mussel which either suffers respiratory failure or starvation.
They have a strong pungent odor znodonta are used by carp fisherman as bait. Index Animalium Sherborn, species and genera until Diffuse pollution has affected its habitat in most areas and dissolved oxygen is reduced in many to dangerously low levels in the summer months.
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Down, BT18 0EU; cedar. Prefers muddy substrate bare of vegetation. 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. 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 in the last toxic stadium. Its native distribution is European-Siberian. Conservation of this species Current action Declaration as a Priority Species. Nomenclator Zoologicus Neave updated, genera. They will then drop off after a period of weeks and find a suitable place on the bottom to begin an independent life. 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.
The Swedish Museum of Natural History. 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.
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. The swan musselAnodonta cygneais a large species of freshwater musselan aquatic bivalve mollusc in the family Unionidaethe river mussels. 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.
From Wikipedia, the free encyclopedia. Life cycle Adults are long lived and there is nearly always a good proportion of mature shells present in colonies.
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Putting a valve of the shell up to strong light separates these two species. This species is found in rivers and lakes.
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. 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 cytnea 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.