Abstract
A new species of portunid crab from the genus Cycloachelous Ward, 1942 is described from Vietnamese waters. Cycloachelous levigatus sp. nov. is morphologically most similar to C. orbitosinus (Rathbun, 1911), which was originally described from the syntype series collected from Western Pacific area (Cargados Carajos Islands, Amirante Islands, Seychelles) and C. octodentatus (Gordon, 1938) described from one single male from Singapore. There are differences in the sternal segments, third maxilliped, chela, abdomen and male gonopode shapes. The specific status of C. levigatus sp. nov. is also clearly supported by molecular data. Aside from a comparison of this new species with other known congeners, new photographs of syntypes of C. orbitosinus and the holotype of C. octodentatus are also provided.
References
Apel, M. & Spiridonov, V.A. (1998) Taxonomy and zoogeography of the portunid crabs (Crustacea: Decapoda: Brachyura: Portunidae) of the Arabian Gulf and adjacent waters. Fauna of Arabia, 17, 159–331
Castresana, J. (2000) Selection of conserved blocks from multiple alignments for their use in phylogenetic analysis. Molecular Biology and Evolution, 17, 540–552.
https://doi.org/10.1093/oxfordjournals.molbev.a026334
Crosnier, A. (1962) Crustacés Décapodes Portunidae. Faune de Madagascar, 16, 1–154. Available from: https://decapoda.nhm.org/pdfs/30643/30643.pdf (accessed 6 July 2017)
Darriba, D., Taboada, G.L., Doallo, R. & Posada D. (2012) jModelTest 2: more models, new heuristics and parallel computing. Nature Methods, 9, 772.
https://doi.org/10.1038/nmeth.2109
Davie, P. J. F. (2002) Crustacea: Malacostraca: Eucarida (Part 2: Anomura, Brachyura). In: Wells, A. & Houston, W.W.K. (Eds.), Zoological catalogue of Australia. 19.3 (B). CSIRO Publishing, Melbourne, Victoria, pp. 1–641.
Fabricius, J.C. (1798) Supplementum Entomologiae Systematicae. C.G. Proft et Storch, Hafniae [Copenhagen], 572 pp.
https://doi.org/10.5962/bhl.title.65803
Gordon, I. (1931) Brachyura from the coasts of China. Journal of the Linnean Society of London, Zoology, 37 (254), 525–558.
https://doi.org/10.1111/j.1096-3642.1931.tb02365.x
Gordon, I. (1938) On three species of Portunidae (Decapoda, Brachyura) from the Malay Peninsula. Bulletin of the Raffles Museum, 14, 175–185.
Haan, W. de (1833–1850) Crustacea. In: Siebold, P.F. von (Ed.) Fauna Japonica sive Descriptio Animalium, Quae in Itinere per Japoniam, Jussu et Auspiciis Superiorum, qui Summum in India Batava Imperium Tenent, Suscepto, Annis 1823–1830 Collegit, Noitis, Observationibus et Adumbrationibus Illustravit. Lugduni-Batavorum, Leiden, 243 pp.
https://doi.org/10.5962/bhl.title.124951
Hasegawa, M., Kishino, H. & Yano, T. (1985) Dating of human-ape splitting by a molecular clock of mitochondrial DNA. Journal of Molecular Evolution, 22 (2), 160–174.
https://doi.org/10.1007/BF02101694
Huelsenbeck, J. P. & Ronquist, F. (2001) MRBAYES: Bayesian inference of phylogeny. Bioinformatics, 17, 754–755.
https://doi.org/10.1093/bioinformatics/17.8.754
Kumar, S., Stecher, G., Li, M., Knyaz, C. & Tamura, K. (2018) MEGA X: Molecular Evolutionary Genetics Analysis across Computing Platforms. Molecular biology and evolution, 35 (6), 1547–1549.
https://doi.org/10.1093/molbev/msy096
Liu, M., Cai, Y. & Tzeng, C. (2007) Molecular systematics of the freshwater prawn genus Macrobrachium Bate, 1868 (Crustacea: Decapoda: Palaemonidae) inferred from mtDNA sequences, with emphasis on East Asian species. Zoological Studies, 46 (3), 272–289. Available from: http://zoolstud.sinica.edu.tw/Journals/46.3/272.pdf (accessed 6 July 2017)
Miers, E.J. (1886) Report on the Brachyura collected by H.M.S. Challenger during the years 1873–1876. In: Murray, J. (Ed.), Zoology. In: Wyville Thomson, C. & Murray, J. (Series Eds.), Report on the Scientific Results of the Voyage of H.M.S. Challenger during the Years 1873–76 under the Command of Captain George S. Nares, R.N., F.R.S. and the Late Captain Frank Tourle Thomson, R.N. Vol. 17. Neill and Company, Edinburgh, pp. 1–362.
Miller, M.A., Pfeiffer, W. & Schwartz, T. (2010) Creating the CIPRES Science Gateway for inference of large phylogenetic trees. In: Proceedings of the Gateway Computing Environments Workshop (GCE), New Orleans, Louisiana, 14 November 2010, 1–8.
https://doi.org/10.1109/GCE.2010.5676129
Milne-Edwards, A. (1861) Études zoologiques sur les Crustacés récents de la famille des Portuniens. Archives du Muséum national d‘Histoire naturelle de Paris, 10, 309–421.
https://doi.org/10.5962/bhl.title.10629
Milne-Edwards, H. (1834) Histoire naturelle des Crustacés comprenant l‘anatomie, la physiologie et la classification de ces animaux. Vol. 1. Librairie Encyclopédique de Roret, Paris, xxxv + 468 pp.
https://doi.org/10.5962/bhl.title.39738
Moosa, M.K. (1996) Crustacea Decapoda: deep-water swimming crabs from the south-west Pacific, particularly New Caledonia (Brachyura, Portunidae). In: Crosnier, A. (Ed.), Résultats des Campagnes MUSORSTOM. Vol. 15. Mémoires du Muséum national d’Histoire naturelle, 168, pp. 503–530.
Naderloo, R. (2017) Atlas of Crabs of the Persian Gulf. Atlas of Crabs of the Persian Gulf. Springer, 443 pp.
https://doi.org/10.1007/978-3-319-49374-9
Ng, P.K.L., Guinot, D. & Davie, P.J.F. (2008) Systema Brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world. The Raffles Bulletin of Zoology, Supplement 17, 1–286. [https://lkcnhm.nus.edu.sg/app/uploads/2017/04/s17rbz.pdf]
Nguyen, T.S. & Ng, P.K.L. (2010) A new genus of the family Portunidae (Crustacea: Decapoda: Brachyura) and the identity of Portunus (Cycloachelous) yoronensis Sakai, 1974. Zootaxa, 2677 (1), 38–48.
https://doi.org/10.11646/zootaxa.2677.1.4
Palumbi, S.R., Martin, A., Romano, S., McMillan, W.O., Stice, L. & Grabowski, G. (1991) The simply fool’s guide to PCR. A collection of PCR protocols. Version 2. University of Hawai, Honolulu, 45 pp. Available from: http://palumbi.stanford.edu/SimpleFoolsMaster.pdf (accessed 6 July 2017)
Rathbun, M.J. (1911) The Percy Sladen Trust expedition to the Indian Ocean in 1905, Under the leadership of Mr. J. Stanley Gardiner. Vol. III. No. XI. Marine Brachyura. Transactions of the Linnean Society of London, Series 2, Zoology, 14 (2), 191–261, pls. 15–20.
Rafinesque, C.S. (1815) Analyse de la Nature, ou Tableau de l’Univers et des Corps Organisés. L’Imprimerie de Jean Barravecchia. Aux deìpens de l‘auteur, Palermo, 224 pp.
https://doi.org/10.5962/bhl.title.106607
Richters, F. (1880) Decapoda. In: Möbius, K. (Ed.), Beiträge zur Meeresfauna der Insel Mauritius und der Seychellen, Berlin, 1880, pp. 137–179.
Ronquist, F. & Huelsenbeck, J.P. (2003) MRBAYES 3: Bayesian phylogenetic inference under mixed models. Bioinformatics, 19, 1572–1574.
https://doi.org/10.1093/bioinformatics/btg180
Sakai, T. (1939) Studies on the Crabs of Japan IV. Brachygnatha, Brachyrhyncha. Vol. 3. Yokendo Co., Ltd., Tokyo, 365–741.
Sakai, T. (1965) The crabs of Sagami Bay collected by His Majesty the Emperor of Japan. Maruzen, Tokyo, 206 pp.
Sakai, T. (1976) Crabs of Japan and the Adjacent Seas. Kodansha, Tokyo, xxxix + 773 pp.
Sayers, E.W., Barrett, T., Benson, D.A., Bryant, S.H., Canese K., Chetvernin, V., Church, D.M., DiCuccio, M., Edgar, R., Federhen, S., Feolo, M., Geer, L.Y., Helmberg, W., Kapustin, Y., Landsman, D., Lipman, D.J., Madden, T.L., Maglott, D.R., Miller, V., Mizrachi, I., Ostell, J., Pruitt, K.D., Schuler, G.D., Sequeira, E., Sherry, S.T., Shumway, M., Sirotkin, K., Souvorov, A., Starchenko, G., Tatusova, T.A., Wagner, L., Yaschenko, E. & Ye, J. (2009) Database resources of the National Center for Biotechnology Information. Nucleic Acids Research, January 2009, 37 (Database Issue), D5–15. [Epub 21 October 2008]
https://doi.org/10.1093/nar/gkn741
Spiridonov, V.A. (1994) The swimming crabs (Crustacea, Brachyura, Portunidae) of submerged rises and insular shelves of the Atlantic and Indian Oceans. Bottom fauna of seamounts. NAUKA–Transactions of the P. P. Shirshov Institute of Oceanology, 129, 126–152.
Spiridonov, V.A. (1999) Results of the Rumphius Biohistorical Expedition to Ambon (1990). Part 8. Swimming crabs of Ambon (Crustacea: Decapoda: Portunidae). Zoologishe Mededelingen, Leiden, 73, 63–97.
Spiridonov, V.A., Neretina, T.V. & Schepetov, D. (2014) Morphological characterization and molecular phylogeny of Portunoidea Rafinesque, 1815 (Crustacea Brachyura): Implications for understanding evolution of swimming capacity and revision of the family-level classification. Zoologischer Anzeiger, 253, 404–429.
https://doi.org/10.1016/j.jcz.2014.03.003
Stephensen, K. (1945) s.n. In: The Brachyura of the Iranian Gulf. Danish Scientific Investigations in Iran, Part IV. E. Munksgaard, Copenhagen, pp. 57–237.
Stephenson, W. (1961) The Australian portunids (Crustacea: Portunidae). V. Recent collections. Australian Journal of Marine and Freshwater Research, 12, 92–128.
https://doi.org/10.1071/MF9610092
Stephenson, W. (1967) The portunid crabs (Crustacea: Portunidae) collected by the NAGA Expedition. In: Scientific Results of Marine Investigations of the South China Sea and the Gulf of Thailand 1959–1961. Vol. 4. Naga Report. Sponsored by South Vietnam, Thailand and the United States of America The University of California Scripps Institution of Oceanography La Jolla, California. Scripps Institution of Oceanography, UC, San Diego, California, pp. 4–38.
Stephenson, W. (1972) An annotated check list and key to the Indo-West-Pacific swimming crabs (Crustacea: Decapoda: Portunidae). Bulletin of the Royal Society of New Zealand, 10, 1–64.
Stephenson, W. (1975) Biological results of the Snellius Expedition, XXVI. The Portunidae (Decapoda- Brachyura) of the Snellius Expedition (part II). Zoologische Mededelingen, 49 (14), 173–209.
Stephenson, W. & Campbell, B.M. (1959) The Australian portunids (Crustacea: Portunidae). III. The genus Portunus. Australian Journal of Marine and Freshwater Research, 10, 84–124.
Stephenson, W. & Rees, M. (1967) Some portunid crabs from the Pacific and Indian Oceans in the collections of the Smithsonian Institution. Proceedings of the United States National Museum, 120, 1–114.
https://doi.org/10.5479/si.00963801.120-3556.1
Stephenson, W. & Rees, M. (1968) The Endeavour and Other Australian Museum Collections of Portunid Crabs (Crustacea, Decapoda, Portunidae). Records of the Australian Museum, 27 (13), 285–298.
https://doi.org/10.3853/j.0067-1975.27.1968.447
Stimpson, W. (1858) Prodromus descriptionis animalium evertebratorum, quae in Expeditione ad Oceanum Pacificum Septentrionalem, a Republica Federata missa, Cadwaladaro Ringgold et Johanne Rodgers Ducibus, observavit et descripsit. Pars IV. Crustacea Cancroidea et Corystoidea. Proceedings of the Academy of Natural Sciences of Philadelphia, 10, 31–40.
https://doi.org/10.5962/bhl.title.51447
Talavera, G. & Castresana, J. (2007) Improvement of phylogenies after removing divergent and ambiguously aligned blocks from protein sequence alignments. Systematic Biology, 56, 564–577.
https://doi.org/10.1080/10635150701472164
Tamura, K. (1992) Estimation of the number of nucleotide substitutions when there are strong transition-transversion and G + C-content biases. Molecular Biology and Evolution, 9, 678–687.
https://doi.org/10.1093/oxfordjournals.molbev.a040023
Vannini, M. & Innocenti, G. (2000) Research on the coast of Somalia. Portunidae (Crustacea: Brachyura). Tropical Zoology, 13, 251–298.
https://doi.org/10.1080/03946975.2000.10531136
Ward, M. (1942) Notes on the Crustacea of the Desjardins Museum, Mauritius Institute, with descriptions of new genera and species. Mauritius Institute Bulletin, 2 (2), 49–113.
Yamaguchi, T, & Baba, K. (1993) Crustacean specimens collected in Japan by Ph. F. von Siebold an H. Bürger and held by the National Natuurhistorisch Museum in Leiden and other museums. In: Yamaguchi, T. (Ed.), Ph. F. von Siebold and Natural History of Japan, Crustacea. The Carcinological Society of Japan, Tokyo, pp. 145–570.
Yang, S.-L., Chen, H.-L. & Dai, A.-Y. (2012) Fauna Sinica Invertebrata, Vol. 49. Crustacea Decapoda Portunidae. Science Press, Beijing, 417 pp.