Noctuidae : Noctuinae
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Photo © Neil Sherman,  Carmarthenshire, Wales. June 2022

Similar Suffolk Species
Small Square-spot
Diarsia rubi
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Fen Square-spot
Diarsia florida

(Schmidt, 1859) 2124 / 73.335

Recent Suffolk Status: Rarely seen in recent years.

Life history: Single-brooded.

Identification: Fen square-spot is larger and paler in colour than Small Square-spot, supposedly appears between the two broods of Small square-spot, is only found in fen habitat in our area and flies late at night.
The genitalia of Fen Square-spot are identical to Small Square-spot so future DNA studies may in fact reveal they are the same species.

Habitat: Fens, acid bogs.

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

Retained Specimen / Photograph will be Required.

Recorded in 3 (5%) of 58 10k Squares.
First Recorded in 1990.
Last Recorded in 2001.
Additional Stats

< Small Square-spot | Red Chestnut >

Determination
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
06/07/2001125TM07 - Thelnetham/Redgrave
30/06/2000+26TL78 - Brandon/Lakenheath
10/06/1997+25TM07 - Thelnetham/Redgrave
1990+25TM49 - Somerleyton/Beccles
Show Details | 1990 to 2024 | 2000 to 2024 | Graph Key
Express Record Fen Square-spot
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Copyright © Lepidoptera UK 2025
   
Click Map for Details

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Forewing: 15-17mm
Flight: One generation June-July
Foodplant:   Unknown
Red List: Data Deficient (DD)
GB Status: Unknown
Former Status: Local
Verification Grade:  Adult: 3
 Immature Adult   [Show Flight Times]
     
Underlying maps using Digital Map Data © Norfolk Online Lepidoptera Archive - NOLA™ - Suffolk 2025. © James Wheeler - Norfolk Moths 2007 - 2025. Data © NOLA™ - Suffolk 2025
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