Lot Anodonta cygnea 5 Pieces Seashell Bivalve Clam Swan Freshwater River Mussel Unionidae

Only 1.30 Euros per Shell ! Lot 5 Anodonta cygnea mm 100-150 Seashell Bivalve Clam Swan Freshwater River Mussel Unionidae, single valves, broken with mud, as in photos.
Also available bivalves individually, at this link.
Family: Unionidae.
Common name: Swan Mussel.
Syn. Anodon paludosus, Anodon simplicidus, Anodonta stagnalis, Anodonta zellensis, Anodonta (Camuriana) bisuntiensis, Anodonta (Milletiana) avenionensis, Anodonta (Sturmiana) autricensis, Anodonta aeneolina, Anodonta aequorea, Anodonta alsatica, Anodonta amnica, Anodonta annesiaca, Anodonta anura, Anodonta arealis, Anodonta aresta, Anodonta arnouldi, Anodonta bouvieri, Anodonta callidaea, Anodonta callosa, Anodonta capitata, Anodonta cariosa, Anodonta cariosula, Anodonta cellensis, Anodonta contorta, Anodonta dealbata, Anodonta dokici, Anodonta duregica, Anodonta epipedacra, Anodonta eucaca, Anodonta eucypha, Anodonta eumorphia, Anodonta eupelina, Anodonta fedderseni, Anodonta foeda, Anodonta fuliginea, Anodonta glabra, Anodonta goesi, Anodonta graeca, Anodonta gravida, Anodonta gregalis, Anodonta hypaeschra, Anodonta immunda, Anodonta intermedia, Anodonta kleciaki, Anodonta laevigata, Anodonta lanceolata, Anodonta limbata, Anodonta lucasii, Anodonta macella, Anodonta misara, Anodonta moesica, Anodonta mutabilis, Anodonta nymphigena, Anodonta oblonga, Anodonta opalina, Anodonta pammegala, Anodonta parmata, Anodonta planulata, Anodonta pulchella, Anodonta ranarum, Anodonta rayopsis, Anodonta retziana, Anodonta ruvidella, Anodonta savensis, Anodonta sieversi, Anodonta sondermannii, Anodonta subluxata, Anodonta sulcata, Anodonta thiessae, Anodonta tigurica, Anodonta tumida, Anodonta variabilis, Anodonta vaschaldei, Anodonta ventricosa, Anodonta waterstoni, Anodonta wimmeri, Anodontes europaea , Mytilus cygneus, Mytilus incrassatus, Mytilus macula, Mytilus maxima, Mytilus radiatus, Mytilus stagnalis, Mytilus zellensis, Unio tumidus.

The Anodonta cygnea is a freshwater bivalve with separate sexes. The shell is typically oval and elongated. Its size can vary greatly, but often reaches 20 cm.
The shell is usually yellow-brownish in color and is quite pot-bellied. The state of growth is clearly evident as the overlaps of the concentric circles added during the growth phases emerge. The interior is typically mother-of-pearl. It is undoubtedly a very particular species as it lives in slow or even stagnant watercourses. It manages to settle with its shell very well in muddy soil, sometimes almost completely, only making the siphons emerge during the water filtration and breathing phases. Their presence has also been found in some lakes and it seems even at considerable depths. This is a very adaptable and equally useful animal: if healthy, it is capable of filtering almost 40 liters of water per hour. Furthermore, the activity of silting helps to keep the substrate oxygenated and avoid the formation of anoxic zones.
Species widespread in Europe, especially in slow-moving watercourses; also present in Italy (excluding the islands).
The species has many synonyms and can be confused by the less experienced with Anodonta anatina or another Unionidae.