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Fen Square-spot
Diarsia florida (Schmidt, 1859)
Noctuidae: Noctuinae
2124 / 73.335
Photo © David Griffiths,  Earith, Cambridge

Similar Norfolk Species
Small Square-spot
Diarsia rubi
Forewing: 15-17mm
Flight: One generation June-July
Foodplant:   Unknown
Red List: Data Deficient (DD)
GB Status: Unknown
Former Status: Local
Verification Grade:  Adult: 4
Norfolk Status

Closely related to Small Square-spot (D. rubi) inhabiting fens and boggy ground. Fen Square-spot (D. florida) is supposedly separated from D. rubi by its larger size, paler hindwing and brighter more orange forewing. D. florida is also thought to be single brooded in the south, appearing between the two generations of D. rubi.

No genitalic differences have been established to separate D. florida from D. rubi and fertile hybrids are readily obtained. D. rubi is considered by some to be in the process of evolutionary separation and others speculate as to whether this is a true species.

Past records from Redgrave Fen, Burgh Common and other sites in the Broads are all subject to conjecture and varying opinions over their validity.

Any claims for Fen Square-spot (D. florida) must be accompanied by a voucher specimen and photographs. Further research is needed to clarify the complex situation.

See Small Square-spot D. rubi

Verification Grade Comment: Varying opinions over the validity of this species.

Determination by Genitalia Examination (gen. det.) Required

Recorded in 6 (8%) of 74 10k Squares.
First Recorded in 1957.
Last Recorded in 1999.

Latest 5 Records
Date#VC10k Area
23/06/1999+27TG41 - Acle/Hemsby
24/07/1996+27TG32 - Stalham/Catfield
20/07/1995+27TG41 - Acle/Hemsby
09/07/1995+27TG32 - Stalham/Catfield
25/07/1992127TG32 - Stalham/Catfield
Further info: Diarsia florida
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