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Table 4 Ligands and chemosensory organs, based on studies in D. melanogaster, are shown for lost and expanded lineages, and genes with signatures of positive selection (a = antenna, p = palp, b = basiconic, t = trichoid, LDO = larval dorsal organ)

From: The making of a pest: Insights from the evolution of chemosensory receptor families in a pestiferous and invasive fly, Drosophila suzukii

  Gene Species Ligands Expression
Losses Or33cP bia Ethyl acetate, Cyclohexanone, Fenchone [100] pb2A [76, 100]
  Or74aP suz E,E-2-4-nonadienal [101] LDO [86]
  Or85aP suz Ethyl 3-hydroxybutyrate [87] ab2B [76]
  Or98bP suz unknown ab6B*[76]
Expansions Or23a suz, tak Isoamyl acetate [83] ai2B [76]
  Or67a suz, bia, tak Ethyl benzoate, Methyl benzoate [83] ab10B [76]
  Gr22a-f tak bitter compounds [102] Labellum [103], larvae [104] legs [105]
  Gr36a-c suz, bia, tak bitter compounds [102] Larvae [104], legs [105]
  Gr59ab suz, bia, tak bitter compounds [102] Larvae [104], legs [105]
  Gr59cd suz, bia, tak bitter compounds [102] Larvae n [104], legs [105]
  Gr93a suz bitter compounds [102] unknown
  Gr98b suz bitter compounds [102] unknown
  Gr98d suz bitter compounds [102] Legs [105]
Positive sel. Or2a suz, bia, tak Ethyl 3-hydroxybutyrate, Isoamyl acetate [83] ai3A [76]
  Or9a tak 2-acetoin, 2,3-butanediol [84] ab8B [76]
  Gr5a suz, bia, tak Trehalose [93, 94] Labellum [103], legs [105]
  Gr58a suz, bia unknown unknown
  Gr97a suz, bia, tak unknown Larvae [104]
  1. *Not confirmed