Priority Site Assessments Assess the value of a site for

Priority Site Criteria Follow the flow chart to determine whether your site qualifies as a Priority Site.

Non- Priority Site

Possible Priority Site

Probable Priority Site

Priority Site

Site of Local Importance

Site of National Importance Nationally Important List

Azure Hawker, caerulea Scarce Chaser, Libellula fulva

Brilliant Emerald, Somatochlora metallica Scarce Emerald Damselfly, Lestes dryas

Common Clubtail, Gomphus vulgatissimus Southern Damselfly, Coenagrion mercuriale

Northern Emerald, Somatochlora arctica Small Red Damselfly, Ceriagrion tenellum

Norfolk Hawker, Aeshna isosceles Variable Damselfly, Coenagrion pulchellum

Northern Damselfly, Coenagrion hastulatum White-faced Darter, Leucorrhinia dubia

Scarce Blue-tailed Damselfly, Ischnura pumilio

Locally Important Species List and Diversity Criteria

The diversity criteria is the minimum number of species that need to have been recorded within the site, within the last 10 years, for it to qualify.

Counties Locally Important Species Diversity criteria Cornwall White-legged Damselfly, Platycnemis pennipes 11 Isles of Scilly , sanguineum Devon White-legged Damselfly, Platycnemis pennipes 14 Red-eyed Damselfly, Erythromma najas Hairy , Brachytron pratense Downy Emerald, Cordulia aenea Ruddy Darter, Sympetrum sanguineum Dorset White-legged Damselfly, Platycnemis pennipes 14 Red-eyed Damselfly, Erythromma najas Downy Emerald, Cordulia aenea Somerset , Aeshna juncea 14 Downy Emerald, Cordulia aenea Black Darter, Hampshire White-legged Damselfly, Platycnemis pennipes 14 Isle of Wight , Brachytron pratense Wiltshire Common Hawker, Aeshna juncea 11 Golden-ringed Dragonfly, Cordulegaster boltonii Downy Emerald, Cordulia aenea Keeled skimmer, coerulescens Black Darter, Sympetrum danae Sussex Downy Emerald, Cordulia aenea 14 Keeled skimmer, Orthetrum coerulescens Black Darter, Sympetrum danae Surrey Hairy Dragonfly, Brachytron pratense 14 Golden-ringed Dragonfly, Cordulegaster boltonii Keeled skimmer, Orthetrum coerulescens Kent Beautiful Demoiselle, Calyopteryx virgo 11 Golden-ringed Dragonfly, Cordulegaster boltonii Downy Emerald, Cordulia aenea Keeled skimmer, Orthetrum coerulescens Berkshire Hairy Dragonfly, Brachytron pratense 14 Oxfordshire Common Hawker, Aeshna juncea Buckinghamshire Golden-ringed Dragonfly, Cordulegaster boltonii Downy Emerald, Cordulia aenea Keeled skimmer, Orthetrum coerulescens Gloucestershire White-legged Damselfly, Platycnemis pennipes 14 Hairy Dragonfly, Brachytron pratense Common Hawker, Aeshna juncea Golden-ringed Dragonfly, Cordulegaster boltonii Downy Emerald, Cordulia aenea Keeled skimmer, Orthetrum coerulescens Black Darter, Sympetrum danae Essex Beautiful Demoiselle, Calyopteryx virgo 11 White-legged Damselfly, Platycnemis pennipes Hairy Dragonfly, Brachytron pratense Downy Emerald, Cordulia aenea Hertfordshire White-legged Damselfly, Platycnemis pennipes 11 Hairy Dragonfly, Brachytron pratense Suffolk White-legged Damselfly, Platycnemis pennipes 11 Norfolk Downy Emerald, Cordulia aenea 11 Keeled skimmer, Orthetrum coerulescens Black Darter, Sympetrum danae Bedfordshire Beautiful Demoiselle, Calyopteryx virgo 11 Northamptonshire Downy Emerald, Cordulia aenea Huntingdonshire Cambridgeshire Warwickshire Hairy Dragonfly, Brachytron pratense 11 Common Hawker, Aeshna juncea Black Darter, Sympetrum danae Worcestershire Red-eyed Damselfly, Erythromma najas 11 Common Hawker, Aeshna juncea Golden-ringed Dragonfly, Cordulegaster boltonii Four-spotted Chaser, Libellula quadrimaculata Lincolnshire Hairy Dragonfly, Brachytron pratense 11 Common Hawker, Aeshna juncea Black Darter, Sympetrum danae Leicestershire Hairy Dragonfly, Brachytron pratense 11 Nottinghamshire Hairy Dragonfly, Brachytron pratense 11 Common Hawker, Aeshna juncea Black Darter, Sympetrum danae Herefordshire Common Hawker, Aeshna juncea 11 Downy Emerald, Cordulia aenea Four-spotted Chaser, Libellula quadrimaculata Black Darter, Sympetrum danae Shropshire Golden-ringed Dragonfly, Cordulegaster boltonii 11 Downy Emerald, Cordulia aenea Keeled skimmer, Orthetrum coerulescens Black Darter, Sympetrum danae Beautiful Demoiselle, Calyopteryx virgo Staffordshire 11 Keeled skimmer, Orthetrum coerulescens Beautiful Demoiselle, Calyopteryx virgo Cheshire Hairy Dragonfly, Brachytron pratense 11 Downy Emerald, Cordulia aenea Golden-ringed Dragonfly, Cordulegaster boltonii Derbyshire 8 Black Darter, Sympetrum danae Hairy Dragonfly, Brachytron pratense Nottinghamshire Common Hawker, Aeshna juncea 11 Black Darter, Sympetrum danae Black-tailed skimmer, Orthetrum cancellatum Lancashire 8 Ruddy Darter, Sympetrum sanguineum Beautiful Demoiselle, Calopteryx virgo Red-eyed Damselfly, Erythromma najas Small Red-eyed Damselfly, Erythromma viridulum , Aeshna mixta Yorkshire 8 Emperor Dragonfly, Anax imperator Hairy Dragonfly, Brachytron pratense Golden-ringed Dragonfly, Cordulegaster boltonii Black-tailed Skimmer, Orthetrum cancellatum Brown Hawker, Aeshna grandis Emperor Dragonfly, Anax imperator Cumbria Broad-bodied Chaser, Libellula depressa 8 Keeled skimmer, Orthetrum coerulescens Ruddy Darter, Sympetrum sanguineum Durham Brown Hawker, Aeshna grandis Northumberland Migrant Hawker, Aeshna mixta Emperor Dragonfly, Anax imperator 8 Broad-bodied Chaser, Libellula depressa Four-spotted Chaser, Libellula quadrimaculata Monmouthshire Red-eyed Damselfly, Erythromma najas Glamorgan Common Hawker, Aeshna juncea Downy Emerald, Cordulia aenea 11 Four-spotted Chaser, Libellula quadrimaculata Black Darter, Sympetrum danae Breconshire Banded Demoiselle, Calyopteryx splendens Radnorshire Beautiful Demoiselle, Calyopteryx virgo Montgomeryshire Red-eyed Damselfly, Erythromma najas White-legged Damselfly, Platycnemis pennipes Black-tailed skimmer, Orthetrum cancellatum 11 Hairy Dragonfly, Brachytron pratense

Migrant Hawker, Aeshna mixta Keeled skimmer, Orthetrum coerulescens Downy Emerald, Cordulia aenea Carmarthenshire Banded Demoiselle, Calyopteryx splendens Pembrokeshire Hairy Dragonfly, Brachytron pratense Cardiganshire Migrant Hawker, Aeshna mixta 11 Keeled Skimmer, Orthetrum coerulescens

Black-tailed Skimmer, Orthetrum cancellatum Merionethshire Red-eyed Damselfly, Erythromma najas Caernarvonshire Hairy Dragonfly, Brachytron pratense Denbighshire Migrant Hawker, Aeshna mixta 11 Flintshire Downy Emerald, Cordulia aenea Anglesey Black-tailed Skimmer, Orthetrum cancellatum Ruddy Darter, Sympetrum sanguineum Scotland Beautiful Demoiselle, Calopteryx virgo Banded Demoiselle, Calyopteryx splendens Hairy Dragonfly, Brachytron pratense 8 , Aeshna cyanea Downy Emerald, Cordulia aenea Keeled Skimmer, Orthetrum coerulescens Flow chart notes

If you believe a site contains breeding populations of a locally or nationally important species, following the left side of the flow chart. If you believe a site contains a number of different breeding species that is the same or higher than the diversity criteria, following the right side of the flow chart.

Species abundance Some steps on the flow chart ask you whether species are abundant. Species abundance relates to the max count of a species seen during a site visit (do not add together the number seen during separate site visits). Records from the last 10 year can be used. Different species have different count requirements in order for them to be judged as abundant. Below are the count requirements for different species: Dragonfly species that need a count of ≥20

Migrant Hawker, Aeshna mixta Damselfly species that need a count of ≥6 Four-spotted Chaser,Libellula quadrimaculata Scarce Emerald Damselfly, Lestes dryas Keeled Skimmer, Orthetrum coerulescens Scarce Blue-tailed Damselfly,Ischnura pumilio Black-tailed Skimmer, Orthetrum cancellatum

Common Darter, Sympetrum striolatum All other Damselflies need a count of ≥20 Ruddy Darter, Sympetrum sanguineum Black Darter, Sympetrum danae

All other Dragonflies need a count of ≥6