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Table 2 Numbers of chemoreceptor genes/proteins per family in selected insect species. In some cases, the number of proteins is higher than the number of genes due to an unusual form of alternative splicing, which is particularly notable for the Oncopeltus GRs. Data are shown for four Hemiptera as well as Drosophila melanogaster, the body louse Pediculus humanus, and the termite Zootermopsis nevadensis [11, 12, 104, 108,109,110, 168]

From: Molecular evolutionary trends and feeding ecology diversification in the Hemiptera, anchored by the milkweed bug genome

Species

Odorant

Gustatory

Ionotropic

Oncopeltus fasciatus 1

120/121

115/169

37/37

Cimex lectularius 1,2

48/49

24/36

30/30

Rhodnius prolixus 1,2

116/116

28/30

33/33

Acyrthosiphon pisum 3

79/79

77/77

19/19

Pediculus humanus 2

12/13

6/8

14/14

Zootermopsis nevadensis

70/70

87/90

150/150

Drosophila melanogaster

60/62

60/68

65/65

  1. 1Hemiptera: Heteroptera
  2. 2Independent acquisitions of hematophagy [16]
  3. 3Hemiptera, phloem feeding