Tortricidae : Olethreutinae
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Photo © Paul Kitchener,  Dunwich, 14 August 2015 (gen. det.)

Similar Suffolk Species
Bactra lancealana
Rush Marble
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Bactra lacteana
Scarce Sedge Marble

Caradja,19161111a / 49.196

Morley’s Final Catalogue: Not listed.

Recent Status: First recognised as a British species in 1998. First recorded in Suffolk 14th August 2015 at Dunwich Forest. It has since been found at other locations.

Life Style: A single brooded species flying in mid-summer and comes to light. The larvae feed in the base of the central stems of Carex panacea. The larvae hibernate and pupate in the larval habitation.

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

Determination by Genitalia Examination (gen. det.) Required

Recorded in 3 (5%) of 58 10k Squares.
First Recorded in 2015.
Last Recorded in 2019.
Additional Stats

Bactra furfurana  |  Bactra robustana >

Determination
Snape Suffolk - Raymond A Watson
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
23/07/2019+25TM34 - Hollesley/Rendlesham Forest
23/07/2018+25TM34 - Hollesley/Rendlesham Forest
19/06/2018+25TM35 - Snape/Tunstall
01/06/2018+25TM35 - Snape/Tunstall
11/08/2017+25TM34 - Hollesley/Rendlesham Forest
Show Details | 1990 to 2019 | 2000 to 2019 |
Express Record Bactra lacteana
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Copyright © Jim Wheeler 2020
   

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Wingspan: 8 mm
Flight: summer
Nat Status: Nationally Scarce B
Verification Grade:  Adult: 4
 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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