Depressed River Mussel (Pseudanodonta complanata)
Key Details
| Taxonomic Groups: | Invertebrate > mollusc > Mollusc (non-marine) |
| Red List Status: | Least Concern (Not Relevant) [LC(nr)] |
| D5 Status: | Included in the baseline Red List Index for England (Wilkins, Wilson & Brown, 2022) |
| Section 41 Status: | (not listed) |
| Taxa Included Synonym: | (none) |
| UKSI Recommended Name: | Pseudanodonta complanata |
| UKSI Recommended Authority: | (Rossmässler, 1835) |
| UKSI Recommended Qualifier: | (none specified) |
| Red List Citation: | Seddon et al., 2014 |
| Notes on taxonomy/listing: | (none) |
Criteria
| Question 1: | Does species need conservation or recovery in England? |
| Response: | Yes |
| Justification: | A species largely confined to England in GB ((A few small populations on Welsh borders) It appears to be stable on many river catchments (e.g. River Arun), but recent surveys detected localised declines in the English stretch of the River Wye, probably due to water quality (eutrophication evident when last surveyed in 2022). |
| Question 2: | Does recovery/ conservation depend on species-specific actions? |
| Response: | No |
| Justification: | Species vulnerable to (1) water pollution; (2) saline intrusion (where it is living in the tidal sections of rivers such as the River Arun and many Broadland Rivers such as Waveney (3) inappropriate river channel maintenance. |
| Question 3: | At a landscape scale, would the species benefit from untargeted habitat management to increase habitat mosaics, structural diversity, or particular successional stages? |
| Response: | No |
| Justification: | This species would not benefit from untargeted management |
Species Assessment
Not relevant as no Key Actions defined.
Key Actions
No Key Actions Defined
Acknowledgment:
Data used on this website are adapted from Threatened species recovery actions 2025 baseline (JP065): Technical report and spreadsheet user guide (Natural England, 2025). Available here.