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Table 2 Proboscis length and food canal diameter of Prosoeca sp. and three nectar-feeding butterflies with comparable proboscis lengths. Figures indicate mean +1 standard deviation; sample size is in brackets. C is the ratio of the proximal to distal diameter of the food canal. The proboscis length and food canal diameters are parameters used previously in the Kingsolver and Daniel (1979) model regarding the fluid flow in lepidopterous proboscides

From: Time management and nectar flow: flower handling and suction feeding in long-proboscid flies (Nemestrinidae: Prosoeca)

  Species
Prosoeca sp. E. lycisca a A. vanilla b P. sennae b
Proboscis length [mm] 37.28 ± 5.04 (20) 36.5 ± 4.1 (20) 19.2 ± 1.8 (18) 29.5 ± 2.2 (9)
Proximal diameter [μm] 196.42 ± 16.14 (5) 74 (1) 79.5 ± 3.31 (4) 86.5 ± 3.44 (2)
Distal diameter [μm] 129.51 ± 15.65 (5) 58 (1) 59.7 ± 2.20 (4) 55.4 ± 27.1 (2)
C 1.53 ± 0.12 (5) 1.28 1.33 ± 0.09 1.56 ± 0.01
  1. aBauder et al. (2011). Data for proximal and distal diameter were calculated from Fig. 2C of the original publication
  2. bMay (1985)