Tortricidae : Olethreutinae
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Photo © Raymond A Watson,  Hollesley, Suffolk. 18 June 2019

Similar Suffolk Species
Bactra furfurana
Mottled Marble
Bactra lancealana
Rush Marble
Approx Length (c. 11mm) Wingspan (16-22mm)
      
      
      
      
    
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Bactra robustana
Saltern Marble

(Christoph, 1872)1112 / 49.197

Morley’s Final Catalogue: Not listed.

Recent Status: Found in the coastal strip of Suffolk, sometimes common.

Life Style: A double brooded species that can be found during summer and often later in the year than other Bactra species. Flies at night and comes to light. The larvae feed in a leaf and stem of Bolboschoenus maritimus. Pupation takes place in the stem within a strong cocoon.

Identification: Bactra are a narrow winged Olethreutinae with pointed wings. The females are predominantly dark from the base to a little below the apex with a paler costa. The dark shading may become a red brown and lighter towards the dorsum and tornus. They may show some of the traits of the males but can seldom be reliably identified without genitalia dissection. The males of Bactra species show a dark hooked mark centrally at two thirds. They may also show a reticulation, dark longitudinal lines, costal strigulae, spots on the termen and even marks in the ocellus. B. furfurana is the most readily recognised as it also has a further two prominent dark marks on the wing. B. lacteana has two parallel short streaks just short of the costa and of the apex. B. robustana is a coastal species and the largest Bactra. It has numerous short costal strigulae that do not become significantly more widely separated as they close in on the apex as they do for B. lancealana. B. lancealana is the commonest species. When these differences are not clear in a specimen then identification is by genitalia dissection. More Info

Verification Grade Comment: Obscurely marked = Grade 4

Recorded in 11 (19%) of 58 10k Squares.
First Recorded in 1965.
Last Recorded in 2019.
Additional Stats

Bactra lacteana  |  Eucosmomorpha albersana >

Determination
Hollesley Suffolk. - Raymond A Watson
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
11/08/2019125TM46 - Minsmere/Leiston
25/07/2019+25TM35 - Snape/Tunstall
23/07/2019125TM44 - Orford Ness
20/07/2019125TM58 - Carlton Colville/Kessingland
18/07/2019125TM44 - Orford Ness
Show Details | 1990 to 2019 | 2000 to 2019 |
Express Record Bactra robustana
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Copyright © Jim Wheeler 2020
   

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Wingspan: 16-22mm
Flight: June to July
Foodplant:   Sea Club-rush
Nat Status: Nationally Scarce B
Verification Grade:  Adult: 2
 Immature Adult
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Underlying maps using Digital Map Data © Norfolk Online Lepidoptera Archive - NOLA™ - Suffolk 2020. © James Wheeler - Norfolk Moths 2007 - 2020. Data © NOLA™ - Suffolk 2020
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