Records are widely but sparsely distributed from Yorkshire southwards, including in the south-west, with no obvious clustering anywhere. The only putative Scottish record is from Orkney in 1832 and requires verification as an extreme outlier before it can be treated as present in Scotland. Low numbers of recent records make the calculation of EOO values problematic, but a drop from six to four locations in the last two decades (notable against a backdrop of an increase in overall sawfly recording) and an AOO of just 36 km2 leads to a status of Vulnerable under Criterion B2.

Only two confirmed records to date, in 1941 and 2016. Most previous determinations of melanurum are now considered unsafe as Benson (1951) did not recognise the other species in the genus. The very low data volumes make it difficult to assess the species against Criteria A or B, but a status of Vulnerable is assigned under Criterion D given that as the species is known from just one recent site (and that not being a nature reserve), a plausible future threat could drive the taxon to CR or EX in a very short time.

Although records are sparse, there is a clear picture of a species that is local but widely distributed in southern Britain, from Norfolk southwards, including south Wales. The species continues to be detected in recent years at low levels, although there was a drop in the number of records between the latest two decades, leading to an assessment of Vulnerable under Criterion B based on a small EOO (14957 km2) , AOO (28 km2) and just six recent locations, coupled with continuing decline.

Previously considered absent from Britain (e.g. by Benson 1951), but some old museum records up to 1927 do suggest a past low-level presence. In addition, there is a single recent record, from Norfolk in 2014. This could be interpreted either as indicating a continuing low-level presence or, alternatively, a recolonisation. This is not a difficult species to identify and hence it would appear to be genuinely rare. A status of Vulnerable has been assigned under Criterion D, given that with a single known site it is plausible that a future threat could drive the taxon to CR or EX in a very short time.

Recorded throughout the whole of mainland Britain, including in native pinewoods and more recently established plantations. This small species is easily overlooked and may still be widespread but analysis of recent records suggests the EOO has declined by 39% in the last ten years. The causes of this decline are not understood, leading to an assessment as Vulnerable against Criterion A.

Historically, records were fairly widespread from south-east England to the Moray Firth, although it has been largely absent from the south-west and East Anglia, and very local in Wales. However, the species has only been recorded from six locations in the last 30 years. Assessment against the criteria leads to a status of Vulnerable, on the basis of a calculated 37% decline in AOO in the last ten years, the causes of which are not understood, in addition to a small overall AOO, low number of locations and a pattern of continuing decline.

Benson (1952) considered this to be a very scarce species, occurring north to Lincolnshire. It has subsequently been found widely as far north as Dundee, and west to Devon and Anglesey, suggesting that a significant range expansion occurred. However, the data now support a status of Vulnerable, based on an estimated reduction of 48% of the AOO between 2012 and 2022, the causes of which are not understood. The assessment end-year was moved forward to 2022 as a record in this year made a difference to the IUCN status (consistent with the overall assessment approach).

Relatively local, mostly in England but with a single record from Scotland and none yet from Wales. The data support an assessment as Vulnerable based on low recent AOO, number of locations and continuing decline in EOO between 2002-2011 and 2012-2021.

Recorded locally but widely, mostly in England with more isolated records in Scotland (including Rum) and Wales. The data support an assessment as Vulnerable based on low recent AOO, number of locations and continuing decline in AOO between 2003-2012 and 2013-2022. As per the policy adopted towards assessment periods set out in the accompanying report, the assessment end-year was moved forward to 2022 as a record in this year made a difference to the IUCN status.

Recorded widely but sparsely throughout Britain, although Scottish records are so far only from the west of the country. The data support a Vulnerable status under Criterion A on the basis of an estimated reduction in AOO of 45% between 2011 and 2021, the causes for which are not understood.