- Black Hairstreak
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Black Hairstreak Scientific classification Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Lepidoptera Family: Lycaenidae Genus: Satyrium Species: S. pruni Binomial name Satyrium pruni
(Linnaeus, 1758)Synonyms Fixsenia pruni
Strymonidia pruni
Nordmannia pruniThe Black Hairstreak (Satyrium pruni) is a butterfly in the family Lycaenidae.
Appearance, behaviour and distribution
This small brown butterfly is one of Britain's most localised and rarest. At first glance it is very similar to the White-letter Hairstreak but the Black Hairstreak has a row of orange spots along the edge of the upper-side hindwing. In the female these spots also extend to the forewings. The undersides are similar to the White-letter but the white line tends to be straighter and the orange border extends onto the forewings. The most conclusive way to distinguish the two is by the row of black spots accompanying the orange band which the White-letter Hairstreak never has. They spend most of their lives in the canopy or in dense scrub, feeding on honeydew, and very rarely come down to ground level. In the UK there are now only about 45 colonies, all in a small part of the East Midlands between Oxford and Peterborough. Historically there have been around 90 known colonies since its discovery in 1828 but there have been many, mostly unsuccessful, introductions at various locations in southern England including one in Surrey in 1952 that seemed to be successful until the habitat was destroyed. It is widespread across Europe and Asia as far as Japan.
Life cycle and foodplants
Eggs are laid singly on young Blackthorn Prunus spinosa growth and it is this stage which hibernates. Although Blackthorn is the main foodplant, Wild Plum Prunus domestica and other Prunus spp are occasionally used. The caterpillar hatches the following spring, at the end of April, just before the buds open and feeds on the flower buds. Older larvae are green and well camouflaged against the leaves on which they feed. Pupation takes place on leaves or twigs in June and the pupae are patterned black and white to mimic a bird dropping, as a defence against being eaten. The adult butterflies of this single-brood (univoltic) species are on the wing from the end of June to mid July.
See also
Categories:- Satyrium
- Butterflies and moths of Europe
- British butterflies
- Butterflies and moths of Asia
- Animals described in 1758
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