Today I noticed that my tarantula spider, species Brachypelma vagans, was creating a web. At first I thought it was going to make a place to prepare for moulting. But based on replies and careful inspection of how a part of the web was constructed it became clear to me that the spider was a male tarantula creating a sperm web. A few days ago I read "The Proper Technique for Sexing Living Theraphosid Spiders", and hence was aware that male tarantulas have a special set of spinnerets (epiandrous fusillae) on a special area (epigastric furrow) of their "belly" and today I was able to observe those spinnerets in action.
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