Arachis LGs with affinities to Lotus and Medicago chromosomes represented as colored blocks, and synteny blocks (SBs) indicated. Arachis LGs are numbered according to  with size in cM indicated below. Marker positions are indicated as horizontal lines across LGs, anchor markers as red lines, other markers as black lines. Colors were assigned to the model species chromosomes so that syntenous chromosomes are represented by corresponding colors. SBs are numbered according to , with the addition of SB11 identified in this study. A full genetic map is in Additional file 2.