Gem (Nycterosea obstipata)


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Gem
Nycterosea obstipata (Fabricius, 1794)
Geometridae : Larentiinae

1720 / 70.047
Immigrant

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Similar Species: None

Forewing:	12-14mm.
Flight:	Arrive April-Nov.
Foodplant:	Various low-growing plants.
Red List:
GB Status:	Immigrant
Verification Grade: Adult: 2

Status
Morley's Final Catalogue: No more than two specimens seem to be known with us. One taken at Bury by Nurse, and misnamed Bolitobia fuliginaria (Ent. 1878, 321); and a second that was attracted to electric light in the middle of Ipswich on 5 September 1893 (Mly).

Recent Suffolk Status: A fairly regular immigrant species.

Life history: Multi-brooded. Does breed in some years but cannot survive the UK winter at any stage currently. Appearing later in recent years, into November with a very late/ early record on 1st January 2022 (E. Jackson).

Identification: Unmistakeable. Males and females differ in colour, with females being much darker.

Habitat: Can appear in a wide variety of habitats including gardens.

Recorded in 30 (52%) of 58 10k Squares.
First Recorded in 1893.
Last Recorded in 2023.

Latest 10 Records
Date	#	VC	10k	Area
03/11/2023	1	25	TM23	Felixstowe/Landguard Point
31/10/2023	1	25	TM34	Hollesley/Rendlesham Forest
31/10/2023	1	25	TM58	Carlton Colville/Kessingland
30/10/2023	1	25	TM23	Felixstowe/Landguard Point
30/10/2023	+	25	TM34	Hollesley/Rendlesham Forest
28/10/2023	1	25	TM23	Felixstowe/Landguard Point
26/10/2023	1	25	TM58	Carlton Colville/Kessingland
23/10/2023	1	25	TM23	Felixstowe/Landguard Point
23/10/2023	1	25	TM59	Lowestoft
22/10/2023	1	25	TM23	Felixstowe/Landguard Point

Further info: Nycterosea obstipata

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