Abstract
THE accompanying photomicrograph (Fig. 1) shows a leg of a young spider of the species Clubiona interjecta Koch, before its escape from the egg-cocoon. Aduits of the family Clubionidæ possess two tarsal claws, but on the tarsi of the spiderling the median, third, claw is present, demonstrating the fact that the possession of three claws is the ancestral condition. All web-spinning spiders have retained the third claw, while many hunting spiders lose it when very young.
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SAVORY, T. The Ancestral Third Claw of a Spider: Clubiona interjecta. Nature 118, 157 (1926). https://doi.org/10.1038/118157c0
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DOI: https://doi.org/10.1038/118157c0
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