Brackish Hydroid (Pachycordyle navis)
Key Details
| Taxonomic Groups: | Invertebrate > coelenterate (=cnidarian) > Cnidarian |
| Red List Status: | (Not Relevant) [(not listed)(nr)] |
| D5 Status: | |
| Section 41 Status: | (not listed) |
| Taxa Included Synonym: | (none) |
| UKSI Recommended Name: | Pachycordyle navis |
| UKSI Recommended Authority: | (Millard, 1959) |
| UKSI Recommended Qualifier: | (none specified) |
| Red List Citation: | (not listed) |
| Notes on taxonomy/listing: | (none) |
Criteria
| Question 1: | Does species need conservation or recovery in England? |
| Response: | No |
| Justification: | This is presumed to be an introduced species since it has only ever been recorded in the vicinity of ports and harbours. Conservation is therefore not appropriate, it has only been found in one location in the UK (Widewater lagoon) and had not been recorded there since 1990 and may therefore be extinct. |
| Question 2: | Does recovery/ conservation depend on species-specific actions? |
| Response: | No |
| Justification: | An apparently expanding species that seems well established in the lower Severn and Wye and tributaries such as the Lugg and probably smaller streams too. (2023 record from Afon Tawe near Swansea and also expanding in Ireland with no records in 2015 Atlas but now recorded from 5 hectads). |
| 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: | N/A |
| Justification: |
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.