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| Cristaria plicata | |
|---|---|
| Name | Cristaria plicata |
| Regnum | Animalia |
| Phylum | Mollusca |
| Classis | Bivalvia |
| Ordo | Unionida |
| Familia | Unionidae |
| Genus | Cristaria |
| Species | C. plicata |
| Binomial | Cristaria plicata |
| Binomial authority | (Leach, 1814) |
Cristaria plicata is a freshwater mussel in the family Unionidae, native to East and Southeast Asia and introduced in other regions. It is a medium to large bivalve notable for its thick, inflated shell and role as a filter-feeder in lotic and lentic systems. The species has significance for aquaculture, traditional industry, and freshwater biodiversity management across its range.
Cristaria plicata was described by Leach in 1814 and placed in the family Unionidae. Historical synonyms and taxonomic treatments have appeared in regional faunal works associated with institutions such as the British Museum and the Natural History Museum, London. Molecular phylogenetic studies referencing collections at the Smithsonian Institution and collaborations with universities including Peking University and National Taiwan University have refined relationships among Asian unionids and clarified generic boundaries used by authors in the Zoological Society of London and publications of the Royal Society.
The shell of this mussel is oblong to ovate, often thick and inflated with concentric growth lines noted in monographs from the Linnean Society of London. Shell coloration ranges from yellowish-brown to dark brown, with nacre that can be bluish or silvery as described in plates in the collections of the British Museum (Natural History). Adult dimensions reported in surveys by the Chinese Academy of Sciences and the Korea Research Institute of Bioscience and Biotechnology vary with habitat productivity. Morphological keys used by curators at the Natural History Museum, London and the Museum für Naturkunde compare hinge teeth and pseudocardinal structures to distinguish Cristaria plicata from sympatric unionids catalogued by the American Museum of Natural History.
Cristaria plicata is native to river basins and lakes in regions administered by the People's Republic of China, Japan, Korea, Taiwan, Russia (Far East), and parts of Southeast Asia. It has been documented in large drainage systems surveyed by teams from the Chinese Academy of Sciences, reports associated with the Asian Development Bank, and regional checklists compiled by the World Wildlife Fund. Introductions and translocations linked to aquaculture and ship traffic involve ports such as Shanghai, Nagoya, and Busan, with occurrence records used by researchers at the International Union for Conservation of Nature and regional museums. Habitats include slow-flowing rivers, floodplain lakes, reservoirs, and oxbow habitats described in environmental impact assessments filed with agencies like the Ministry of Ecology and Environment (China).
As a filter-feeding bivalve, Cristaria plicata influences water clarity and nutrient cycling in systems monitored by agencies including the Environmental Protection Agency (United States) in comparative studies and the Japanese Ministry of the Environment in regional programs. Reproductive biology involves a parasitic larval stage (glochidium) that attaches to fish hosts; host-fish relationships have been studied with reference to species documented by the Food and Agriculture Organization and regional fisheries institutes such as the Fisheries Research Agency (Japan). Growth rates, longevity, and recruitment have been assessed in experimental work at institutions including Northeast Agricultural University and the University of Tokyo. Predators and competitors recorded in community ecology studies include piscivorous taxa and invasive bivalves noted in reports by the International Union for Conservation of Nature and the Global Invasive Species Programme.
Populations face threats from habitat modification driven by infrastructure projects like dams commissioned by entities such as the Three Gorges Corporation and water pollution tracked by the Ministry of Ecology and Environment (China). Overharvesting for pearl production and human consumption has been documented in market surveys by the Food and Agriculture Organization and local fisheries bureaus. Invasive species, altered flow regimes from hydroelectric projects promoted by multinational firms, and contaminant inputs from industrial centers including Shenzhen and Tianjin contribute to declines reported in assessments prepared for the International Union for Conservation of Nature. Regional conservation measures have been implemented by agencies such as the Korean Ministry of Environment and provincial bureaus in cooperation with NGOs like the WWF.
Cristaria plicata has economic importance in pearl culture, traditional craft industries, and local fisheries markets documented in reports from the China Association for Science and Technology and trade records involving ports such as Guangzhou. Shell material and nacre have been used in button manufacture and ornamental inlay in workshops supplied through commercial channels linked to firms in Zhejiang and Fujian provinces. Aquaculture operations for this species have been trialed by academic groups at Sun Yat-sen University and research institutes associated with the Chinese Academy of Sciences to produce pearls and to support livelihoods in riverine communities recorded in socioeconomic studies by the Asian Development Bank.
Research priorities include host-fish identification, propagation techniques, and genetic diversity assessments pursued by collaborations among the Chinese Academy of Sciences, Peking University, University of Tokyo, and the Smithsonian Institution. Management practices incorporate captive breeding, habitat restoration projects funded by regional governments and organizations such as the Asian Development Bank, and monitoring protocols adopted by environmental ministries in China, Japan, and Korea. Ex situ conservation and hatchery methods have been described in technical bulletins from aquaculture centers affiliated with the Ministry of Agriculture and Rural Affairs (China) and university extension services at institutions like Northeast Agricultural University.