Main: (Geometridae / Ennominae)
70.239 [B&F: 1919] Purple Thorn (Selenia tetralunaria) (Hufnagel, 1767)

 

Notes: Common in woodland, scrub, gardens and a wide range of other habitats throughout much of England, spreading into Scotland. In Hampshire and on the Isle of Wight Fairly common and widespread in all three vice-counties. Emerges in two well defined broods, peaking in April and July. Records before 1975 are few, so the graphs shown below are taken from this point forwards. Wingspan 46-52 mm. The most likely confusion species is Lunar Thorn Selenia lunularia, both share the same posture at rest, but Lunar Thorn has the postmedian line straighter, joining the costa closer to the base of the forewing, and lacks the dark spot near the dorsum on the hindwing of Purple Thorn. Larva feeds on various broad-leaved trees, including Hazel, Birch, Alder, Hawthorn and Oak, over-wintering as a pupa.

Flightime guide
JFM AMJ JAS OND

Records Received By Year

% of total records
Max records: 160
90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13

Percentage of Total Records

Total records
Max Percentage: 0.13128032
90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13

Phenology - Adult Records

Max records: 296
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Phenology - Larval Records

Max records: 1
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Distribution Map

Historical distribution at tetrad resolution
Click for density map

Record Density

As above but the larger the symbol, the greater the number of records
Click for distribution map
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