Lacunae rostralis: A new structure on the rostrum of sailfish Istiophorus platypterus
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Recent comparative studies of billfishes (Istiophoridae and Xiphiidae) have provided evidence of differences in the form and function of the rostra (bill) among species. Here, we report the discovery of a new structure, lacuna rostralis, on the rostra of sailfish Istiophorus platypterus, which is absent on the rostra of swordfish Xiphias gladius, striped marlin Kajikia audax and blue marlin Makaira nigricans. The lacunae rostralis are small cavities that contain teeth. They were found on the ventral rostrum surface of all I. platypterus specimens examined and dorsally in half of them. Ventrally, the lacunae rostralis were most prominent in the mid-section of the rostrum. Dorsally, they occurred closer to the tip. The density of lacunae rostralis increased towards the rostrum tip but, because they are smaller in size, the percentage of rostrum coverage decreased. The teeth located within the lacunae rostralis were found to be different in size, location and orientation from the previously identified micro-teeth of billfish. We propose two potential functions of the lacunae rostralis that both relate to the use of the bill in feeding: mechanoreception of prey before tapping it with the bill and more efficient prey handling via the creation of suction, or physical grip.
Originalsprog | Engelsk |
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Tidsskrift | Journal of Fish Biology |
Vol/bind | 100 |
Udgave nummer | 5 |
Sider (fra-til) | 1205-1213 |
Antal sider | 9 |
ISSN | 0022-1112 |
DOI | |
Status | Udgivet - 2022 |
Bibliografisk note
Funding Information:
Deutsche Forschungsgemeinschaft, Grant/Award Numbers: project number 390523135, GZ:HA 9403/1‐1 AOBJ: 675842 Funding information
Funding Information:
We thank the staff of Solo Buceo in Cancun, and Captain Marco and his team in Puerto San Carlos, for providing us with opportunities to observe the hunting behaviour of sailfish and striped marlin in the wild. We also thank fishermen and observers who collected billfish heads onboard commercial fishing vessels in Sardinia, Mexico and Reunion Island. Furthermore, we want to thank Ole Lenz for his help in pre‐processing the micro‐computed tomography data. We acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy – EXC 2002/1 ‘Science of Intelligence’ – project number 390523135 (J. K.) and a DFG grant awarded to Matthew J. Hansen GZ: HA 9403/1‐1 AOBJ: 675842
Publisher Copyright:
© 2022 The Authors. Journal of Fish Biology published by John Wiley & Sons Ltd on behalf of Fisheries Society of the British Isles.
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