49.150 Apotomis betuletana (Birch Marble)
ws: 17-22mm; Jul-Sep; birch (Betula spp); common in birch woods and heaths throughout GB
Synonym: Apotomis betulaetana (Pierce & Metcalfe)
Synonym: Apotomis betulaetana (Pierce & Metcalfe)
Apotomis betuletana §4 male
ID: Differences between A.betuletana and A.capreana are comparative rather than absolute but the following should help, features for A.betuletana given first: 1) posterior margin of median fascia fairly straight vs concave; 2) hook-like indentation near middle of posterior margin of median fascia weak vs strong; 3) black dots in subterminal fascia absent or weak vs stronger; 4) basal 2/3 more strongly marked with black vs less black. A.turbidana is similar but distinguished by its basal white costal markings. A.sororculana has a black apex.
Male genitalia: valva fairly straight. In A.capreana the valva is strongly twisted in its long axis.
Male genitalia: valva fairly straight. In A.capreana the valva is strongly twisted in its long axis.
Dissection
Male genitalia
Female genitalia
§1 Newborough Forest, Anglesey; 30/07/2007; fw 9.2mm
§2 Newborough Forest, Anglesey; 01/08/2007; fw 9.2mm
§3 Eskdale, Cumbria; 24/08/2007; fw 9.4mm
§4 Ardnamurchan, Highland; 10/07/2012; male
§5 Foulness, Essex; 05/08/2012; female
§6 Foulden Common, Norfolk; 14/08/2016; male
§7 Seathwaite, Cumbria; 27/07/2016; male; fw 8.9mm
All images © Chris Lewis
§2 Newborough Forest, Anglesey; 01/08/2007; fw 9.2mm
§3 Eskdale, Cumbria; 24/08/2007; fw 9.4mm
§4 Ardnamurchan, Highland; 10/07/2012; male
§5 Foulness, Essex; 05/08/2012; female
§6 Foulden Common, Norfolk; 14/08/2016; male
§7 Seathwaite, Cumbria; 27/07/2016; male; fw 8.9mm
All images © Chris Lewis
Page published 08/01/2013 (§1-5) | §6 added 16/04/2017 | §7 added 28/06/2017
