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Table 3 Statistics performed on the same sample sizes for heads and wings: females (18 Panstrongylus chinai vs 15 P.howardi); males (25 P. chinai vs 21 P. howardi)

From: Chagas vectors Panstrongylus chinai (Del Ponte, 1929) and Panstrongylus howardi (Neiva, 1911): chromatic forms or true species?

Metric divergence between taxa

Heads

Wings

Females

Males

Females

Males

Comparisons of size

 Mean

P < 0.0001*

P < 0.0001*

ns

0.006*

 Variance

ns

ns

ns

ns

Comparisons of shape

 Mahalanobis

P < 0.0001*

P < 0.0001*

P = 0.002*

P < 0.0001*

 Percent contribution of size

52

58

2

18

 Validated reclassification P. chinai

77%

80%

66%

92%

 Validated reclassification P. howardi

73%

76%

93%

85%

 Metric disparity P. chinai

16.8

12.2

8.6

7.9

 Metric disparity P. howardi

10.1

16.4

7.7

6.8

 Metric disparity, comparisons

ns

(*)

ns

ns

  1. *P < 0.05
  2. Notes: “Contribution of size to shape divergence” is the coefficient of determination after regressing the discriminant factor on size variation; “Validated reclassification”, scores of correctly assigned specimens based on shape variation
  3. Abbreviations: P, risk of error estimated according to non-parametric technique based on permutation tests (1000 runs); ns, not significant; Mahalanobis, shape differences between taxa according to the Mahalanobis distances