{"refrec":{"BRefID":410446,"RR":"<b>Goto, R.; Takeshita, F.; Hirai, A.; Tsuchihashi, A.; Tanogashira, R.; Yamamori, L.; Asakura, A.; Shimomura, M.</b> (2025). Sound production by vibration of the major cheliped in the ghost crab <i>Ocypode sinensis</i> (Ocypodidae). <i>Plankton Benthos Res. 20(2)</i>: 169-174. <a href=\"https://dx.doi.org/10.3800/pbr.20.169\" target=\"_blank\">https://dx.doi.org/10.3800/pbr.20.169</a>","BEntID":408255,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Plankton Benthos Res. 20(2)</i>: 169-174. <a href=\"https://dx.doi.org/10.3800/pbr.20.169\" target=\"_blank\">https://dx.doi.org/10.3800/pbr.20.169</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Goto, R.; Takeshita, F.; Hirai, A.; Tsuchihashi, A.; Tanogashira, R.; Yamamori, L.; Asakura, A.; Shimomura, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Goto, R. <i>et al.</i>","Englishabstract":"Ghost crabs, <i>Ocypode</i> species of the Ocypodidae, are common in temperate to tropical sandy beaches and are well known for producing sounds using their chelipeds. <i>Ocypode sinensis</i> Dai &amp; Yang in Song &amp; Yang, 1985 and its sister species <i>Ocypode cordimana</i> Latreille, 1818 are distinct in this genus in lacking the specialized stridulatory apparatus on the palm that the other congeneric members use for sound production. In this study, we report the sound production behavior of <i>O. sinensis</i> collected from the sandy beaches in southwestern part of the Kii Peninsula (Shirahama and Susami), Wakayama Prefecture, Japan. Three males of <i>O. sinensis</i> collected in June, September, and October, respectively, produced loud sounds by rapidly vibrating their major cheliped at certain intervals at the burrow entrance or inside the burrows. A similar cheliped vibration behavior has been reported as ‘rapping’ in <i>Ocypode jousseaumei</i> (Nobili, 1905) and some other congeneric species, or ‘quivering’ in <i>Ocypode stimpsoni</i> Ortmann, 1897, although <i>O. sinensis</i> apparently did not knock the sand substrate directly, unlike the other species. This sound production behavior was observed only during the day under laboratory conditions. Additionally, the crab sporadically produced clicking sounds, likely by rubbing the mandibles. According to quantitative observations of a male <i>O. sinensis</i> in Shirahama, a train of cheliped vibration lasted 36–193 s, consisting of 9–35 pulses, each of which lasted about 0.98 s on average. The average interval between the pulses within a train was 4.8 s. Although the functions of the sound production by cheliped vibration remain unknown, it may function to attract mates or warn intruders, as suggested in other <i>Ocypode</i> species. In addition, we also briefly observed a similar cheliped vibration behavior in <i>Ocypode ceratophthalmus</i> (Pallas, 1772) in the burrow during this study. Our findings provide a better understanding of the evolution of sound production behavior in <i>Ocypode</i> and Ocypodidae.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Sound production by vibration of the major cheliped in the ghost crab <i>Ocypode sinensis</i> (Ocypodidae)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-07-25 01:58:08.139750","timezone_type":1,"timezone":"+02:00"},"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2025,"MonPub":null,"DateUpdate":"2025-08-01","DateCreate":"2025-08-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0,"DOI":"10.3800/pbr.20.169"},"refs":null,"anarec":{"AnaID":410446,"PubliDate":2025,"Pagination":"169-174","XtraPublOfAnaID":null,"ISBN":null,"Volume":"20","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":236886,"SerRR":"Plankton & Benthos Research. 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