Fig. 2: Facial morphology of C. formosanus, C. gestroi and the putative hybrids. | Heredity

Fig. 2: Facial morphology of C. formosanus, C. gestroi and the putative hybrids.

From: Hybrids of two destructive subterranean termites established in the field, revealing a potential for gene flow between species

Fig. 2

A C. formosanus, head saddle brown, no antennal spots or only dim patches. B C. gestroi, head coconut brown (darker brown) with apparent antennal spots. C The putative hybrids, head saddle brown with apparent antennal spots. D Morphometric distribution of Taiwanese Coptotermes alates. The unit of both axes is the light intensity value measured under the 8-bit RGB color model. The brightness of head (x axes) was obtained by summing RGB values, and the contrast between head and antennal spots (y axes) was quantified through the Euclidean distance between the RGB value of head and spot.The same capital letter after the measurements are not significantly different at the α = 0.05 level for each character. E The antennal spot of C. formosanus, the border of the spot blurry, and if present, both the dorsal and the ventral borders convex. F The antennal spot of C. gestroi and the putative hybrids, with the dorsal border convex and the ventral border concave. G C. gestroi and the putative hybrids showed a distinct thickness of the antennal spots.

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