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Hexanchus
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<h2 id="swimming-behavior">Swimming behavior</h2> <p>The bluntnose sixgill shark, <i>Hexanchus griseus</i>, is relatively common to scientists. However, very little information exists about its distribution patterns, migrations and behavior. Data on occurrence and behavior of sixgill sharks inhabiting waters north of Spain (Galicia and Cantabrian Sea, NE Atlantic) were obtained from yearly oceanographic trawl surveys. Data obtained from one electronic pop-up tag (Mini PAT), provided information about depth and temperature preferences over 75 days. Mean depth obtained during that period was 913 m (depth range 727–1247 m), and the mean temperature was 10.3 °C, (range 8.0–10.8 °C). Movements up and down in the water column within a single day ranged from 50 to 385 m. No cyclic diel vertical migration was however observed, the shark having moved smoothly without a defined pattern.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> </p><p>The six-gill sharks have the ability to alter their feeding behaviors due to the situation that they are in. A feeding behavior analysis displayed that the six-gill sharks are able to utilize a bite of food compared to other aquatic vertebrates.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> </p> <h2 id="extant-species">Extant species</h2> <ul><li><i><a href="/facts/Bluntnose_sixgill_shark/snfuyl3c">Hexanchus griseus</a> </i> (<a href="/facts/Pierre_Joseph_Bonnaterre/R5cLDDEc">Bonnaterre</a>, 1788) (bluntnose sixgill shark)</li> <li><i><a href="/facts/Bigeyed_sixgill_shark/knC5QDsG">Hexanchus nakamurai</a></i> <a href="/facts/Teng_Huo-Tu/BQBu2cVg">Teng</a>, 1962 (bigeyed sixgill shark)</li> <li><i><a href="/facts/Atlantic_sixgill_shark/GeWLIeLy">Hexanchus vitulus</a></i> <a href="/facts/Stewart_Springer/XGAA5uoz">Springer</a> & Waller, 1969 (Atlantic sixgill shark)<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a><a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></li></ul> <h2 id="extinct-species">Extinct species</h2> <ul><li><i>Hexanchus agassizi</i> <a href="/facts/Henri_Cappetta/RysdDXPr">Cappetta</a>, 1976</li> <li><i>Hexanchus andersoni</i> Jordan, 1907</li> <li><i>Hexanchus casieri</i> Kozlov, 1999</li> <li><i><a href="/facts/Hexanchus_collinsonae/TgDN7rhY">Hexanchus collinsonae</a></i> Ward, 1979</li> <li><i>Hexanchus gracilis</i> Davis, 1887</li> <li><i>Hexanchus hookeri</i> Ward, 1979</li> <li><i>Hexanchus microdon</i> <a href="/facts/Louis_Agassiz/W3DJ3zFN">Agassiz</a>, 1843</li> <li><i>Hexanchus tusbairicus</i> Kozlov in Zhelezko & Kozlov, 1999</li></ul> <p>Records earlier than <a href="/facts/Albian/faHcmHDC">Albian</a> such as <a href="/facts/Jurassic/o5Cy4KzX">Jurassic</a> species <i>H. arzoensis</i> and <i>H. wiedenrothi</i> are later considered as misidentification, the first moved to <i>Notidanoides</i> and later moved to <i><a href="/facts/Crassodontidanus/jHMkHI8x">Crassodontidanus</a></i>.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a><a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> </p> <h2 id="see-also">See also</h2> <ul> <li>Sharks portal</li></ul> <ul><li><a href="/facts/Shark_teeth/WLD76gQx">Shark teeth</a></li> <li><a href="/facts/List_of_prehistoric_cartilaginous_fish_genera/J8tboPK7">List of prehistoric cartilaginous fish genera</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=159815">"Hexanchus"</a>. <a href="/facts/Integrated_Taxonomic_Information_System/nVg7fQUG">Integrated Taxonomic Information System</a>. Retrieved 6 June 2006.</li> <li>Ebert, David A. (10 February 1986). "Biological Aspects of the Sixgill Shark, <i>Hexanchus griseus</i>". <i>Copeia</i>. 1986 (1): 131–135. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.2307%2F1444898">10.2307/1444898</a>. <a href="/facts/JSTOR_(identifier)/YTeVmaJ7">JSTOR</a> <a href="https://www.jstor.org/stable/1444898">1444898</a>.</li> <li>Ebert, D.A. (June 1994). <a href="https://doi.org/10.2989%2F025776194784287030">"Diet of the sixgill shark <i>Hexanchus griseus</i> off southern Africa"</a>. <i>South African Journal of Marine Science</i>. 14 (1): 213–218. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.2989%2F025776194784287030">10.2989/025776194784287030</a>.</li> <li>Andrews, Kelly S.; Williams, Greg D.; Farrer, Debbie; Tolimieri, Nick; Harvey, Chris J.; Bargmann, Greg; Levin, Phillip S. (August 2009). "Diel activity patterns of sixgill sharks, <i>Hexanchus griseus</i>: the ups and downs of an apex predator". <i>Animal Behaviour</i>. 78 (2): 525–536. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1016%2Fj.anbehav.2009.05.027">10.1016/j.anbehav.2009.05.027</a>. <a href="/facts/S2CID_(identifier)/ldJsHa2Y">S2CID</a> <a href="https://api.semanticscholar.org/CorpusID:53161681">53161681</a>.</li> <li>Cione, Alberto L.; Reguero, Marcelo (January 1994). "New records of the sharks <i>Isurus</i> and <i>Hexanchus</i> from the Eocene of Seymour Island, Antarctica". <i>Proceedings of the Geologists' Association</i>. 105 (1): 1–14. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1016%2FS0016-7878%2808%2980134-4">10.1016/S0016-7878(08)80134-4</a>.</li> <li><a href="https://www.youtube.com/watch?v=pHuvs9Qqa5o"><i>Large specimen filmed at 1,000 m depth</i></a> (video). <a href="https://ghostarchive.org/varchive/youtube/20211221/pHuvs9Qqa5o">Archived</a> from the original on 2021-12-21 – via YouTube.</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Kindersley, Dorling (2001). Animal. New York City: DK Publishing. ISBN 978-0-7894-7764-4.[page needed] <a href="978-0-7894-7764-4" target="_blank">978-0-7894-7764-4</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"New shark species confirmed: Genetic testing finds a different sixgill shark". ScienceDaily. Retrieved 7 February 2019. <a href="https://www.sciencedaily.com/releases/2018/02/180220122928.htm" target="_blank">https://www.sciencedaily.com/releases/2018/02/180220122928.htm</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"New species of shark discovered through genetic testing". phys.org. Retrieved 7 February 2019. <a href="https://phys.org/news/2018-02-species-shark-genetic.html" target="_blank">https://phys.org/news/2018-02-species-shark-genetic.html</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Rodríguez-Cabello, Cristina; González-Pola, César; Rodríguez, Augusto; Sánchez, Francisco (September 2018). "Insights about depth distribution, occurrence and swimming behavior of Hexanchus griseus in the Cantabrian Sea (NE Atlantic)". Regional Studies in Marine Science. 23: 60–72. doi:10.1016/j.rsma.2017.10.015. S2CID 134282217. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>McNeil, B.; Lowry, D.; Larson, S.; Griffing, D. (2016). "[no title cited]". PLOS ONE. 11 (5): e0156730. doi:10.1371/journal.pone.0156730. PMC 4887027. PMID 27243237. S2CID 2448005.[full citation needed] <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4887027" target="_blank">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4887027</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"New shark species confirmed: Genetic testing finds a different sixgill shark". ScienceDaily. Retrieved 7 February 2019. <a href="https://www.sciencedaily.com/releases/2018/02/180220122928.htm" target="_blank">https://www.sciencedaily.com/releases/2018/02/180220122928.htm</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"New species of shark discovered through genetic testing". phys.org. Retrieved 7 February 2019. <a href="https://phys.org/news/2018-02-species-shark-genetic.html" target="_blank">https://phys.org/news/2018-02-species-shark-genetic.html</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Cione, Alberto Luis; Medina, Francisco (2009). "The oldest hexanchiform shark from the Southern Hemisphere (Neoselachii; Early Cretaceous, Antarctica)". Antarctic Science. 21 (5): 501–504. doi:10.1017/s0954102009990228. ISSN 0954-1020. <a href="https://dx.doi.org/10.1017/s0954102009990228" target="_blank">https://dx.doi.org/10.1017/s0954102009990228</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Szabó, Márton (2020-03-01). "A Late Jurassic (Kimmeridgian–early Tithonian) fish fauna of the Eperkés-hegy (Olaszfalu, Bakony Mts., Hungary): the oldest record of Notidanodon Cappetta, 1975 and a short revision of Mesozoic Hexanchidae". Palaeobiodiversity and Palaeoenvironments. 100 (1): 151–170. doi:10.1007/s12549-018-00368-x. ISSN 1867-1608. <a href="https://doi.org/10.1007/s12549-018-00368-x" target="_blank">https://doi.org/10.1007/s12549-018-00368-x</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> </ol>