Sidmouth to Dorset coastal wildbelt: invertebrates

The Sidmouth to Dorset coastal wildbelt is a unique mosaic of changing habitats.

They support a wealth of rare and threatened insects and are the only place in the UK where the Spanish snout cranefly is known to be.

Image caption or title (to be replaced)Image credits

1. About

The unstable cliffs between Sidmouth and the Dorset border are one of the most remarkable areas for invertebrates in the UK, as well as in Devon. They support many threatened species including species groups such as flies and beetles that are often overlooked. There are several reasons why this area is an invertebrate hotspot: 

Unstable cliffs: The cliffs are some of the most active in Europe and are constantly being reshaped by erosion, slumping and crumbling. The resulting landslips are known as undercliffs. Constant bare ground is crucial for species like furrow bees, which burrow and nest in it. Other species depend on the vegetation that quickly colonizes these newly exposed areas. 

Seepages: Many of the insects (especially the rare flies) rely on the mosaic of wet areas that run along the cliffs, including calcareous springs, seepages, streams and patches of fen. These features often appear on unstable slopes and frequent landslips prevent the habitats being lost to scrub growth.

Climate: The temperate climate along the coast (no extremes of temperature or drought) allows many species to thrive.

Diverse habitats: The varied geology (chalk and mudstone cliffs), combined with the features above, creates a dynamic mosaic of scrubby, flower-rich grasslands (on the cliff tops and slumped cliffs), wetlands, rainforest-like undercliffs, bare cliffs and shingle beach dissected by wooded stream valleys (coombes). These intermingled habitats support a remarkable diversity of rare invertebrates in a relatively small area and are why this stretch of cliffs and coast is so special.

The undercliffs are designated as SSSI and are within the Sidmouth to West Bay SAC. Part of this area is designated as the Axmouth to Lyme Regis National Nature Reserve (see the LNRS Viewer). They also lie in the Jurassic Coast World Heritage Site.

This group brings together fourteen Focus Species that need similar habitat but different micro habitat. Eight are also identified as Devon Special Species. Many of the species in this group are not listed on the SSSI citation and may also rely on habitats which lie outside the SSSI.

Other Devon Species of Conservation Concern found along this stretch of coast include xxxx.

2. What we need to do and where

Priority

Increase the abundance and distribution of invertebrates across the East Devon cliffs, in particular those identified as Focus Species

Focus species

Broad-faced furrow bee

Lasioglossum laticeps

The bees nest in cracks that form when wet south-facing clay cliffs dry out in the summer.

They’re a eusocial species, which means they nest in groups and divide up responsibilities, entrusting others to look after their young. 

The bees feed on a range of flowers in coastal grasslands near to their nesting sites. 

Cliff furrow bee

Lasioglossum (Evylaeus) angusticeps

Although it hasn’t been recorded since 1995, it is hard to identify and may still exist along this stretch of coast.

The bee nests in burrows they excavate in clay exposed by landslips at the base of cliffs. Common birds-foot-trefoil (common in grasslands along this stretch of coast) is their most important forage plant. 

Buff-banded mining bee

Andrena (Cnemidandrena) simillima

The buff-banded mining bee is more widespread as it’s found in various locations along the south coast, preferring calcareous (limestone and chalk) cliffs.  

It excavates single burrows in sheltered, fairly loose bare soil, but can be found in quite high numbers.  Knapweed is thought to be its critical food plant, but it also feeds on bramble, common fleabane, hemp agrimony, thistle species and wild marjoram. 

Spined blood bee

Sphecodes spinulosus

The last known Devon record for the spined blood bee was in Branscombe in 1978. However, it may still be present along this stretch of coast so greater survey effort is needed.

It forages on a range species such as buttercups, spurge, hogweed and wild carrot. It’s known as a blood bee due to its black and red colouring and because it lays its eggs in the nest of the orange-footed furrow bee (Halictus rubicundus), relying on this bee to rear its young. The orange-footed furrow bee has some recent records in Devon, including this stretch of coast, and is a Devon Species of Conservation Concern. 

Spanish snout cranefly

Helius hispanicus

The only place in the UK where it’s found is seepages at Haven Cliff just east of Axmouth harbour. 

Other Focus Species of flies in this group are the UK priority species six-spotted lamb (Idiocera sexguttata), Platycephala umbracula, a grass fly associated with reedbeds and Herina oscillans, a picture-winged fly. The bees feed on a range of flowers in coastal grasslands near to their nesting sites. 

All species depend on features which remain wet throughout the year, free from dense shading by woody growth. 

Wood white

Leptidea sinapis

The wood white butterfly is one of the UK’s lightest and smallest butterfly species. It has a unique, almost ghostly appearance due to its pale, white wings.  

It lives in habitats with tall grassland or light shrub (which provide shade and shelter) and with vetches (the caterpillar foodplant), including bitter vetch, tufted vetch, birds-foot trefoil and greater birds-foot trefoil.   

It breeds twice a year with adults flying in May or June and August. In Devon, the remaining populations are found on this stretch of coast (due to the scrubby grasslands), Meeth quarry in North Devon and Cookworthy Forest.    

Morris’s wainscot

Photedes fluxa 

 In the UK, Morris’s wainscot is only found on this stretch of coast, between Axmouth and Eype in Dorset. It lives at the base of slipping cliffs, where the caterpillar’s foodplant tall fescue grows. Larvae are found in the stems of smaller, weak plants which are stressed by growing on the slipping cliff.   

A striking brown and white patterned adult moth rests on a pale stone. The moth is fairly large with a rectangular outline that ends with a small head at the top of the photo and two round wing ends at the bottom. The moths base colour is a dark brown with mirrored mottled white and black patterns on each wing. There are two long, thin antennae at either side of the head.

White spot

Hadena albimacula

White spot caterpillars feed on the seeds of Nottingham catchfly, which is also a Focus Species. They initially live in the seed capsule, then hide under the base of the plant by day and feed on the seeds at night.  

The moths fly in May and June. White spots are found on vegetated shingle and chalk or limestone cliffs from Branscombe to Kent where Nottingham catchfly grows. In Devon, they are found between Branscombe and Seaton. 

A devonshire wainscot adult moth is seen resting on small, dry twigs. The moth has light brown-beige wings with dark brown edges and central stripe on each of the outer wings. The small strip of inner wing that is visible is off-white. The upper outer wings and head are dark brown going to black at the very front of the moth.

Devonshire wainscot

Leucania putrescens

The Devonshire wainscott is only found on the coasts of Devon, Cornwall, Somerset, South Wales and Pembrokeshire. They’re rare in Devon but can be seen along both the north and south coasts.  

Adults fly from mid-July to early September. Eggs are laid on various grasses which caterpillars feed on through the winter.  

Photograph of white pea moth larvae feeding signs. A large blade of grass with rounded nibbled edges at the end and dried brown patches along the length is in the foreground. The background shows various, unidentifiable green stems.

White pea moth

Grapholita gemiferana

White pea moth

This page has no content.

This micromoth is only known to be on the East Devon undercliffs, the Isle of Wight and in Kent, where it was found more recently. It is an endangered species.   

Caterpillars feed on the narrow-leaved everlasting-pea and can be found in July and August. Moths fly late May to June.  

Everlasting-pea blister also feeds on narrow-leaved everlasting pea but is slightly more widespread in Devon, known to be on the coast from Shaldon to Branscombe.    

The micromoth is photographed on a large matte green leaf with an irregular veining pattern. The moth itself has an orage fluffy looking head. It's two outer wings are pale brown-beige along the top half before going into a horizontal white stripe, then black stripe. Six pale legs are just visible under the wings.

Golden edged dot

Stigmella auromarginella

These micromoths are found along the coasts of Dorset and East Devon. Their limited distribution may be due to temperature.  Caterpillars feed on the leaves of bramble on the cliffs. 

A very fluffy moth caterpillar crawls from one very fluffy green leaf to another. The larvae itself is pale brown- beige with a lighter central stripe running vertically down it's body.

Dingy white plume

Merrifieldia baliodactylus

The caterpillars of this micromoth feed on wild marjoram in spring, biting through the stem and causing the upper leaves to wilt. It frequents hillsides and waste ground. Moths fly in July and August. Mainly distributed in the southern counties of England. 

Cliff tiger beetle

Cylindera germanica

In the UK, the cliff tiger beetle is only found on this stretch of coast (Branscombe to Lyme Regis), the Jursssic coast in Dorset and the Isle of Wight. As with many of the species in this assemblage, they are thermophilic (warmth-loving), so are only found on south facing cliffs with plenty of bare ground.   

Known as the cheetah of the insect world, this long-legged beetle uses its incredible speed to catch its prey. Even as larvae these beetles are fearsome insect predators. The larvae ambush their prey and pull them into their damp sand burrows.  

Atop a background of pale round pebbles, a small cricket is resting. It has a solid, dark grey-black, ridged abdomen, a coppery brown head and bosy, and pale brown-beige legs. There are two long, thin antennae protruding from the top of the head, facing in front of the cricket, and three dark, pointed tails protruding from the rear of the cricket.

Scaly cricket

Pseudomogoplistes vicentae

The scaly cricket is a rare invertebrate found on shingle beaches in the UK. Until the late 1990s, it was thought to only be present in the coastal shingle habitat of Chesil Beach in Dorset – but is now known from 3 sites in England and Wales. The species was recorded in Devon around 1998, and lives in shingle along the seaweed strandline, where it forages at night as an omnivorous scavenger. Its lifecycle spans two years: eggs are laid in driftwood and hatch after roughly a year, typically in June. The nymphs then progress through their instars (phase between two periods of moulting) over the next year, reaching adulthood by the following summer.  

Actions

Habitat Management

  • Manage (through light grazing and scrub control) and expand a connected mosaic of sunny, flower-rich areas and scrub on the cliffs and cliff tops to provide the specific food plants and conditions these rare invertebrates need (see About above for more information).
  • Control invasive species such as pampas grass, holm oak, rhododendron, laurel and buddleia, particularly where they interfere with natural processes and shade out wet features such as seepages.
  • Ensure that natural slippage and hydrological regimes continue unchecked to maintain bare wet and dry areas.
  • Ensure high water quality.

Monitoring

  • Monitor the rare invertebrates and share records with the county species recorders (details in Find out more below) and DBRC.
  • Map the springs, seepages, streams, runnels and patches of fen and improve understanding of the hydrology of the seepages and how to maintain them.

Actions for other Focus Species, Habitats and Common themes

Other Focus Species (with a wider distribution) which can also be found along this stretch of coast are: 

Where to focus action

  • The Sidmouth to Dorset coastal wildbelt is shown on the LNRS Viewer. The wood white butterfly also has its own Focus Area mapped, which overlaps with this stretch of coast. 
  • The exact locations of invertebrates aren’t mapped in the LNRS. See Find out more below for more information on invertebrates. 
  • Do we add key landowners / organisations? National Trust, Natural England, East Devon Protected Landscape, Devon Fly Group, Devon Moth Group, Butterfly Conservation.

3. Inspiration

Where to visit

Always follow the Countryside Code and keep to footpaths and sites which are managed for public access. 

Axmouth to Lyme Regis Undercliff National Nature Reserve 

A fantastic coastal path walk takes you through a tangle of lush vegetation that opens up to beautiful views of the sea, framed by the dense woody canopy. 

Try and spot Goat Island, a well-known feature of the coast. The island was the first scientifically described landslip and was visited by Queen Victoria. You can find out more on the Love Lyme Regis website. 

Beer to Branscombe

Another section of the South West Coast Path, this route is well-loved by locals and the café at Branscombe provides the perfect opportunity for a mid-walk ice cream! You can find out more on the National Trust website.

For information on visiting these and other sites see the Explore Devon website. 

4. Find out more

The Devon Fly Group (part of the dipterists forum) has information on Devon’s flies and how you can help to record them. 

The Devon Moth Group has information on Devon’s moths, including records and how to record. Devon LNRS Sidmouth to Dorset coastal wildbelt: invertebrates v1.0 Mar25 

The Bees Wasps and Ants Recording Society has information on all bees, ants and wasps. 

Buglife have published a fact file on the Cliff Tiger Beetle. 

The British Entymological and Natural History Society has lots of information about Britain’s invertebrates. 

Find out what’s happening in East Devon on the East Devon District Councils webpages. 

The habitat these invertebrates depend on is part of the East Devon National Landscape (previously known as AONBs). Their website has information on local projects and to help you explore the area. 

See Sidmouth nature for more on the species and habitats local to this area.

Search this site:

clear
Beta