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As in other fiddler crabs, the male has a greatly enlarged claw, which is used for [[Signalling theory|signalling]]. The higher the claw is waved by the male, the greater his chance of attracting a female; the size of the claw is therefore subject to [[sexual selection]].[{{cite journal |journal=[[Evolution (journal)|Evolution]] |volume=63 |issue=9 |pages=2363–2371 |year=2009 |title=The cost of reliable signaling: experimental evidence for predictable variation among males in a cost-benefit trade-off between sexually selected traits |author=Minoru Murai |author2=Patricia R. Y. Backwell |author3=Michael D. Jennions |name-list-style=amp |doi=10.1111/j.1558-5646.2009.00726.x |pmid=19453725|doi-access=free }}] Furthermore, larger male fiddler crabs wave their claws at a faster rate than smaller fiddler crabs to attract larger females. Larger females are more desirable because they produce more eggs than smaller females.[{{Cite journal |last=Tina |first=Fahmida Wazed |last2=Muramatsu |first2=Daisuke |date=October 2019 |editor-last=Bertram |editor-first=Susan |title=Size‐dependent mating preference of the male fiddler crab Austruca perplexa |url=https://onlinelibrary.wiley.com/doi/10.1111/eth.12961 |journal=Ethology |language=en |volume=126 |issue=1 |pages=68–75 |doi=10.1111/eth.12961 |issn=0179-1613|url-access=subscription }}] |
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As in other fiddler crabs, the male has a greatly enlarged claw, which is used for [[Signalling theory|signalling]]. The higher the claw is waved by the male, the greater his chance of attracting a female; the size of the claw is therefore subject to [[sexual selection]].[{{cite journal |journal=[[Evolution (journal)|Evolution]] |volume=63 |issue=9 |pages=2363–2371 |year=2009 |title=The cost of reliable signaling: experimental evidence for predictable variation among males in a cost-benefit trade-off between sexually selected traits |author=Minoru Murai |author2=Patricia R. Y. Backwell |author3=Michael D. Jennions |name-list-style=amp |doi=10.1111/j.1558-5646.2009.00726.x |pmid=19453725|doi-access=free }}] Furthermore, larger male fiddler crabs wave their claws at a faster rate than smaller fiddler crabs to attract larger females. Larger females are more desirable because they produce more eggs than smaller females.[{{Cite journal |last=Tina |first=Fahmida Wazed |last2=Muramatsu |first2=Daisuke |date=October 2019 |editor-last=Bertram |editor-first=Susan |title=Size‐dependent mating preference of the male fiddler crab Austruca perplexa |url=https://onlinelibrary.wiley.com/doi/10.1111/eth.12961 |journal=Ethology |language=en |volume=126 |issue=1 |pages=68–75 |doi=10.1111/eth.12961 |issn=0179-1613|url-access=subscription }}] |
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Waving is a strategic behavior used by males to signal to females that they are a desirable mate. By using their claw they are communicating with females and the environment around them (including possible competition). [{{Citation |title=Afruca |date=2026-04-15 |work=Wikipedia |url=https://en.wikipedia.org/w/index.php?title=Afruca&oldid=1349113450 |access-date=2026-04-18 |language=en}}] |
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[[Afruca|Waving]] is a strategic behavior used by males to signal to females that they are a desirable mate. By using their claw they are communicating with females and the environment around them (including possible competition). [{{Citation |title=Afruca |date=2026-04-15 |work=Wikipedia |url=https://en.wikipedia.org/w/index.php?title=Afruca&oldid=1349113450 |access-date=2026-04-18 |language=en}}] |
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''Austruca perplexa'' is usually found on sandy substrates near river mouths or on sheltered beaches in the mid-intertidal zone, usually near mangroves.[{{cite web | url=http://queenslandcoast.blogspot.com.au/2015/04/guide-to-fiddler-crabs-of-queensland.html | title=Queensland Coast: Guide to Fiddler Crabs of Queensland | date=4 April 2015 }}]{{clear_left}} |
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''Austruca perplexa'' is usually found on sandy substrates near river mouths or on sheltered beaches in the mid-intertidal zone, usually near mangroves.[{{cite web | url=http://queenslandcoast.blogspot.com.au/2015/04/guide-to-fiddler-crabs-of-queensland.html | title=Queensland Coast: Guide to Fiddler Crabs of Queensland | date=4 April 2015 }}]{{clear_left}} |
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