73.266 Lacanobia (Dianobia) suasa (Dog's Tooth)
fw: 15-20mm (Waring & Townsend), ws: 32-42mm (MBGBI9); bivoltine in south May-Jul, Jul-Sep, univoltine in north Jun-Jul; various herbaceous plants; local throughout GB, most common in saltmarsh, coastal grassland and moorland in the south.
ID: Typically forewing ground colour is greyish-brown; pale subterminal line with a 'W' in the dorsal half; usually the two 'V's of the W are each filled with a white streak that extends proximal to the subterminal line; dart mark, usually solid and dark; black median streak at the forewing base. Form dissimilis has a fairly uniformly brown forewing; a dark outlined (rather than solid) dart mark and has a standard 'W' mark without white streaks; it also has poorly marked antemedian and postmedian lines. Form dissimilis resembles L.oleracea (Bright-line Brown-eye) but the dart mark is missing in L.oleracea and its oval mark is white-outlined; and L.thalassina (Pale-shouldered Brocade) which has well-marked antemedian and postmedian lines (however genital dissection may be required in ambiguous specimens).
§1 Foulness, Essex; 13/06/2009; female; fw 18.6mm; form suasa
§2 Foulness, Essex; 26/06/2010; fw 18.9mm; form suasa
§3 Foulness, Essex; 30/05/2011; male; fw 18.2mm; form suasa
§4 Foulness, Essex; 29/05/2013; female; fw 17.0mm; form suasa
§5 Snettisham, Norfolk; 05/07/2013; form suasa
§6 Foulness, Essex; 27/06/2015; male; fw 17.5mm; form dissimilis
§7 North Warren, Suffolk; 16/07/2017
§8 Foulness, Essex; 20/06/2020; male; fw 16.1mm; form suasa
§9 Foulness, Essex; 06/08/2022; female; fw 16.3mm; form suasa
§L1 St Marys, Isles of Scilly; 26/09/2011
All images © Chris Lewis
§2 Foulness, Essex; 26/06/2010; fw 18.9mm; form suasa
§3 Foulness, Essex; 30/05/2011; male; fw 18.2mm; form suasa
§4 Foulness, Essex; 29/05/2013; female; fw 17.0mm; form suasa
§5 Snettisham, Norfolk; 05/07/2013; form suasa
§6 Foulness, Essex; 27/06/2015; male; fw 17.5mm; form dissimilis
§7 North Warren, Suffolk; 16/07/2017
§8 Foulness, Essex; 20/06/2020; male; fw 16.1mm; form suasa
§9 Foulness, Essex; 06/08/2022; female; fw 16.3mm; form suasa
§L1 St Marys, Isles of Scilly; 26/09/2011
All images © Chris Lewis
Page published 23/10/2016 (§1-6) | §7 added 15/04/2018 | §8 added 25/01/2021 | §9 added 23/12/2022