Abstract
A new species of eolepadid stalked barnacle, Vulcanolepas fijiensis sp. nov., was collected from a hydrothermal vent in the North Fiji Basin, Southwestern Pacific Ocean, at a depth of 1988 m. Based on morphological characteristics, this new species was distinguished from its relatives, V. osheai Buckeridge, 2000, V. parensis Southward, 2005, V. scotiaensis Buckeridge, Linse & Jackson, 2013, and V. buckeridgei Chan & Chang, 2018. Based on morphological characteristics, Vulcanolepas species are divided mainly into two groups by the size of the first mandibular tooth; the first group has a large mandibular first tooth (V. parensis, V. scotiaensis, and V. fijiensis sp. nov., the second a small mandibular first tooth (V. osheai and V. buckeridgei). The new species can be easily distinguished from V. parensis and V. scotiaensis by the length ratio of antenniform segments to robust segments of the rami of cirrus I. Vulcanolepas fijiensis sp. nov. also differs from V. parensis by the length ratio of the penis and cirrus VI (1/10 vs 1/4), and the extension the carinal apex to the tergum (extended vs not extended). Additionally, the sequence divergence of the cytochrome c oxidase 1 gene between V. fijiensis sp. nov. and the other neolepadid species (except V. parensis from its original locations) ranged from 4.2% to 14.0%. In a neighbor-joining tree, V. fijiensis sp. nov. formed an independent branch. These results infer that V. fijiensis sp. nov. is a new species, distinct from the other known neolepadids.
References
Bachraty, C., Legendre, P. & Desbruyères, D. (2009) Biogeographic relationships among deep-sea hydrothermal vent faunas at global scale. Deep Sea Research Part I: Oceanographic Research Papers, 56, 1371–1378.
https://doi.org/10.1016/j.dsr.2009.01.009
Buckeridge, J.S. (1983) The fossil barnacles (Cirripedia: Thoracica) of New Zealand and Australia. New Zealand Geological Survey Paleontological Bulletin, 50, 1–152.
Buckeridge, J.S. (2000) Neolepas osheai sp. nov., a new deep-sea vent barnacle (Cirripedia: Pedunculata) from the Brothers Caldera, south-west Pacific Ocean. New Zealand Journal of Marine and Freshwater Research, 34, 409–418.
https://doi.org/10.1080/00288330.2000.9516944
Buckeridge, J.S. & Grant-Mackie, J.A. (1985) A new scalpellid barnacle from the lower Jurassic of New Caledonia. Geologie de la France, 1, 77–80.
Buckeridge, J.S. & Newman, W.A. (2006) A revision of the Iblidae and the stalked barnacles (Cirripedia: Thoracica), including new ordinal, familial and generic taxa, and two new species from New Zealand and Tasmanian waters. Zootaxa, 1136, 1–38.
Buckeridge, J.S., Linse, K. & Jackson, J.A. (2013) Vulcanolepas scotiaensis sp. nov., a new deep-sea scalpelliform barnacle (Eolepadidae: Neolepadinae) from hydrothermal vents in the Scotia Sea, Antarctica. Zootaxa, 3745, 551–568.
https://doi.org/10.11646/zootaxa.3745.5.4
Chan, B.K.K., Hoeg, J.T. & Garm, A. (2008) Setal morphology and setation patterns of barnacle cirri: adaptations and implications for thoracican evolution. Journal of Zoology (London), 275, 294–306.
https://doi.org/10.1111/j.1469-7998.2008.00441.x
Chan, B.K.K. & Chang, Y.W. (2018) A new deep-sea scalpelliform barnacle, Vulcanolepas buckeridgei sp. nov. (Eolepadidae: Neolepadinae) from hydrothermal vents in the Lau Basin. Zootaxa, 4407, 117–129.
https://doi.org/10.11646/zootaxa.4407.1.8
Desbruyères, D., Hashimoto, J. & Fabri, M.C. (2006) Composition and biogeography of hydrothermal vent communities in Western Pacific back‐arc basins. In: Back-arc spreading systems: geological, biological, chemical, and physical interactions. Washington, DC: American Geophysical Union, pp. 215–234.
https://doi.org/10.1029/166GM11
Folmer, O., Black, M., Hoeh, W., Lutz, R. & Vrijenhoek, R. (1994) DNA primers for amplification of mitochondrial cytochrome c oxidase subunit I from diverse metazoan invertebrates. Molecular Marine Biology and Biotechnology, 3, 294–297.
Hebert, P.D.N., Cywinska, A. & Ball, S.L. (2003) Biological identifications through DNA barcodes. Philosophical Transactions of the Royal Society of London, Series B: Biological Sciences, 270, 313–321.
https://doi.org/10.1098/rspb.2002.2218
Herrera, S., Watanabe, H. & Shank, T.M. (2015) Evolutionary and biogeographical patterns of barnacles from deep-sea hydrothermal vents. Molecular Ecology, 24, 673–689.
https://doi.org/10.1111/mec.13054
Kumar, S., Stecher, G. & Tamura, K. (2016) MEGA7: Molecular evolutionary genetics analysis version 7.0 for bigger datasets. Molecular Biology and Evolution, 33, 1870–1874.
https://doi.org/10.1093/molbev/msw054
Matzen da Silva, J., Creer, S., dos Santos, A., Costa, A.C., Cunha, M.R., Costa, F.O. & Carvalho, G.R. (2011) Systematic and evolutionary insights derived from mtDNA COI barcode diversity in the Decapoda (Crustacea: Malacostraca). PLoS ONE, 6, e19449.
https://doi.org/10.1371/journal.pone.0019449
Mitarai, S., Watanabe, H., Nakajima, Y., Shchepetkin, A.F. & McWilliams, J.C. (2016) Quantifying dispersal from hydrothermal vent fields in the western Pacific Ocean. Proceedings of the National Academy of Sciences 113, 11, 2976–2981.
https://doi.org/10.1073/pnas.1518395113
Newman, W.A. (1979) A new scalpellid (Cirripedia); a Mesozoic relic living near an abyssal hydrothermal spring. Transactions of the San Diego Society of Natural History, 19, 153–167.
Plouviez, S., Schultz, T.F., McGinnis, G., Minshall, H., Rudder, M. & van Dover, C.L. (2013) Genetic diversity of hydrothermal-vent barnacles in Manus Basin. Deep Sea Research Part I: Oceanographic Research Papers, 82, 73–79.
https://doi.org/10.1016/j.dsr.2013.08.004
Southward A.J. (2005) Systematics and ecology of a new species of stalked (Cirripedia: Thoracica: Scalpellomorpha: Eolepadidae: Neolepadini) from the Pacific-Antarctic Ridge at 38°S. Senkenbergiana Maritima, 35, 147–156.
https://doi.org/10.1007/BF03043683
Southward, A.J. & Jones, D.S. (2003) A revision of stalked barnacles (Cirripedia: Thoracica: Scalpellomorpha: Eolepadidae: Neolepadinae) associated with hydrothermalism, including a description of a new genus and species from a volcanic seamount off Papua New Guinea. Senckenbergiana Maritima, 32, 77–93.
https://doi.org/10.1007/BF03043086
Southward, A.J. & Newman, W.A. (1998) Ectosymbiosis between filamentous sulphur bacteria and a stalked barnacle (Scalpellomorpha, Neolepadinae) from the Lau Back Arc Basin, Tonga. Cahiers de Biologie Marine, 39, 259–262.
Van Dover, C.L. (1990). Biogeography of hydrothermal vent communities along seafloor spreading centers. Trends in Ecology & Evolution, 5, 242–246.
https://doi.org/10.1016/0169-5347(90)90063-J
Watanabe, H.K., Chen, C., Marie, D.P., Takai, K., Fujikura, K. & Chan, B.K.K. (2018) Phylogeography of hydrothermal vent stalked barnacles: a new species fills a gap in the Indian Ocean ‘dispersal corridor’ hypothesis. Royal Society Open Science, 5: 172408.
http://dx.doi.org/10.1098/rsos.172408
Watling, L., Guinotte, J., Clark, M.R. & Smith, C. R. (2013). A proposed biogeography of the deep ocean floor. Progress in Oceanography, 111, 91–112.
https://doi.org/10.1016/j.pocean.2012.11.003
Yamaguchi, T. & Newman, W.A. (1990) A new and primitive barnacle (Cirripedia: Balanomorpha) from the North Fiji Basin abyssal hydrothermal field, and its evolutionary implications. Pacific Science, 44, 135–155.
Yamaguchi, T., Newman, W.A. & Hashimoto, J. (2004) A cold seep barnacle (Cirripedia: Neolepdinae) from Japan and the age of the vent/seep fauna. Journal of the Marine Biological Association of the United Kingdom, 84, 111–120.
https://doi.org/10.1017/S0025315404008975h