35.069 Monochroa elongella (Heinemann, 1870)

Status and Distribution

Rare, found in several widely scattered locaties in Wales and south of a line from the Severn to the Wash in England. Predominantly associated with coastal sand dunes but has also been found well inland on sparsely vegetated chalk grassland.

National Status: 

pRDB 1

Bradley & Fletcher no: 

743

Provisional Map

Maps updated with all data received by February 2016.

    Set Specimens

    Monochroa elongella - 27.vii.1984, Braunton Burrows, Devon (Photo: R J Heckford)

    Dissection Group

    Foodplant and Larval Feeding Signs

    Monochroa elongella foodplant Potentilla anseria (silverweed) Wilts 2014 (Photo: S Palmer)

    Potentilla anserina (silverweed), see plant distribution map.

    Plant looks rather sickly, drooping slightly when a larva is present.

    Foodplant Map

    Habitat

    Monochroa elongella habitat Tilshead, Wilts May 2014 (Photo: S Palmer)  Monochroa elongella habitat Tilshead, Wilts May 2014 (Photo: S Palmer)  Monochroa elongella habitat Wilts 2014 (Photo: S Palmer)

    Sand dunes and chalk downland, at the latter in well worn track edges or sparesely vegetated areas.

    Finding the Moth

    Larva: feeds in the roostock and has been found as a pupa in the stems presumably feeding from late August through to May. Tenanted plants at a chalk downland site have been located in areas where the soil is quite bare and adjacent to vehicle tracks with little other plant competition. When a larva is present the plant looks rather sickly, drooping slightly.

    Adult: can be disturbed during the day, flies at night and comes to light.

    Similar Species

    A generally dark greyish brown moth with darker streaking sometimes discernable in the centre of the forewing. The final quarter of the forewing is generally darker scaled and paler tornal and costal patches are possible to see in some specimens. The apical cilia has areas of thin blackish scales giving a smudged-like effect due to the paler fringes between them. The critical feature of three pale rings on the apical third of the antenna (which is white at the tip) can be difficult to see in all but bred specimens but the ochreous-yellow scales on the upperside of the abdomen on segment two and three are obvious.

    Larval Occurrence

    Larval Occurrence

    Flight Period

    Flight Period

    Single brooded from mid-June to late August.

    Earliest: 16th June 2004 (VC8)

    Latest: 3rd September 2002 (VC8)