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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