Disentangling true shape differences and experimenter bias: are dextral and sinistral snail shells exact mirror images?

showed significant or near-significant differences between S1 (sinistrals from site 1) and D2 (dextral from site 2) in all biometrics except APEANG, which appeared to result from S1 being overall larger than D2 [centroid size was significantly greater ( P =0.03 and 0.02, respectively) in both sessions].

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Some of our volunteers found highly significant differences that were of the same order of magnitude as those reported in the literature for other chirally dimorphic species, whereas other individuals, using the same shells and the same tools, found no difference whatsoever.

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suturalis shells from 22 separate populations, and showed a significant trend for sinistrals to be stouter.

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