Abstract
Phylogenetic relationships within the “symmetrical” hermit crab family Pylochelidae were analyzed for 41 of the 45 species and subspecies currently considered valid. In the analyses, 78 morphological characters comprised the data matrix and the outgroup consisted of Thalassina anomala, a member of the Thalassinidae, and Munida quadrispina, a member of the Galatheidae. A poorly resolved strict consensus tree was obtained from a heuristic parsimony analysis of unweighted and unordered characters, which showed the family Pylochelidae and the subfamilies Pylochelinae and Pomatochelinae to be monophyletic taxa – the latter two groups had the highest Bremer support values. Additionally, while the subgenus Pylocheles (Pylocheles) was strongly supported, the subgenera Xylocheles, and Bathycheles were not. More fully resolved trees were obtained when using implied weighting, which recognized the monotypic subfamilies Parapylochelinae, Cancellochelinae and Mixtopagurinae. The subfamily Trizochelinae was found to have four distinct clades and several ambiguously placed taxa.References
Ahyong, S.T. & O’Meally, D. (2004) Phylogeny of the Decapoda Reptantia: Resolution using three molecular loci and morphology. The Raffles Bulletin of Zoology, 52, 673–693.
Alcock, A. (1894) Natural history notes from H.M. Indian Marine Survey Steamer ‘Investigator’, Commander R.F. Hoskyn, R.N., commanding.—Series II., No. 1. On the results of deep-sea dredging during the season 1890–91. Annals and Magazine of Natural History, (6)13, 225–245.
Alcock, A. (1905) Anomura. Fasc. I. Pagurides. Catalogue of the Indian decapod Crustacea in the collections of the Indian Museum, 2, i–xi, 1–197. Indian Museum, Calcutta.
Bate, C.S. (1888) Report on the Crustacea Macrura dredged by H.M.S. Challenger during the years 1872–76. In: Report on the scientific results of the voyage of H.M.S. Challenger during the years 1873–76. Zoology, 24 (52), i–xc, 1–942.
Benedict, J.E. (1902) Descriptions of a new genus and forty-six new species of crustaceans of the family Galatheidae, with a list of the known marine species. Proceedings of the United States National Museum, 26, 243–334.
Boas, J.E.V. (1926) Zur Kenntnis symmetrischer Paguriden. Konelige Danske Videnskabernes Selskabs Skrifter, Biologiske Meddelelser, 5 (6), 1–52.
Bouvier, E.-L. (1940) Décapodes marcheurs. Faune de France, 37. Paul Lechevalier, Paris, 404 pp.
Bremer, K. (1988) The limits of amino acid sequence data in angiosperm phylogenetic reconstruction. Evolution, 42, 795–803.
Bremer, K. (1994) Branch support and tree stability. Cladistics, 10, 295–304.
Calman, W.T. (1909) Crustacea. Part VII, Apendiculata, fasc. 3. In: Lanchester, R. (Ed.), A treatise on Zoology. Adams and Charles Black, London, pp. i–vii, 1–346.
Dixon, C. J., Ahyong, S.T. & Schram, F.R. (2003) A new hypothesis of decapod phylogeny. Crustaceana 76, 935–975.
Fabricius, J.C. (1793) Entomologia Systematica Emendata et Aucta, Secundum Classes, Ordines, Genera, Species, Adjectis Synonimis, Locis, Observationibus, Descriptionibus. 2, viii + 519 pp. Hafniae.
Forest, J. (1987a) Les Pylochelidae ou “Pagures symetriques” (Crustacea Coenobitoidea). In: Résultats des campagnes MUSORSTOM. Mémoires du Muséum National d’Histoire Naturelle, Série A, Zoologie, 137, 1–254.
Forest, J. (1987b) Ethology and distribution of Pylochelidae (Crustacea Decapoda Coenobitoidea). Bulletin of Marine Science, 41 (2), 309–321.
Forest, J, & McLaughlin, P.A. (2000) Superfamily Coenobitoidea. In: Forest, J., M. de Saint Laurent, P.A. McLaughlin, & R. Lemaitre, The marine fauna of New Zealand: Paguridea (Decapoda: Anomura) exclusive of the Lithodidae. NIWA Biodiversity Memoir, 114, 31–103.
Goloboff, P.A. (1993) Estimating character weights during tree search. Cladistics, 9, 83–91.
Goloboff, P.A, Farris, J. & Nixon, K. (2003) T.N.T. Tree Analysis Using New Technology. (http://www.zmuc.dk/public/phylogeny/tnt).
Goloboff, P.A., Carpenter, J.M., Arias, J.S. & Esquivel, D.R.M. (2008) Weighing against homoplasy improves phylogenetic analysis of morphological data sets. Cladistics, 24, 758–773.
Henderson, J.R. (1888) Report on the Anomura collected by H.M.S. Challenger during the years 1873–76. Scientific Results of the Exploratory Voyage of HMS Challenger, (Zoology) 27, i–xi, 1–221. Her Majesty’s Stationary Office, Edinburgh etc.
Herbst, J.F.W. (1804) Versuch einer Naturgeschichte der Krabben und Krebse etc. etc., 3 (4), 1–49. Stralsund, Berlin.
MacDonald J.D., Pike, R.B. & Williamson, D.I. (1957) Larvae of the British species of Diogenes, Pagurus, Anapagurus and Lithodes (Crustacea, Decapoda). Proceedings of the Zoological Society of London, 128, 209–257.
Maddison, W.P. (1993) Missing data versus missing characters in phylogenetic analysis. Systematic Biology, 42 (4), 576–581.
Maddison, W.P. & Maddison, D.R. (1992) MacClade, version 3. Analysis of phylogeny and character evolution. Sinauer Associates, Inc., Sunderland, MA.
Martin, J.W. & Abele, L.G. (1986) Phylogenetic relationships of the genus Aegla (Decapoda: Anomura: Aeglidae), with comments on anomuran phylogeny. Journal of Crustacean Biology, 6 (3), 576–616.
McLaughlin, P.A. (1983) Hermit crabs—Are they really polyphyletic? Journal of Crustacean Biology, 3, 608–621.
McLaughlin, P.A. (2003) Illustrated keys to families and genera of the superfamily Paguroidea (Crustacea: Decapoda: Anomura), with diagnoses of genera of Paguridae. Memoirs of Museum Victoria, 60 (1), 111–144.
McLaughlin, P.A. (2008) A new species of the hermit crab genus Cancellus (Decapoda: Anomura: Paguroidea: Diogenidae) from the PANGLAO Expeditions to the Philippine Islands. Raffles Bulletin of Zoology, Supplement 19, 83-90.
McLaughlin, P.A. & Lemaitre, R. (1997) Carcinization – fact or fiction? I. Evidence from adult morphology. Contributions to Zoology, 67 (2), 79–123.
McLaughlin, P.A. & Lemaitre, R. (2008) Larvae of two species of Trizocheles (Decapoda: Anomura: Paguroidea: Trizochelinae), description of the adult of one, and preliminary implications of development on pylochelid phylogeny. Zootaxa, 1911, 52–68.
McLaughlin, P.A., Lemaitre, R., & Sorhannus, U. (2007) Hermit crab phylogeny: A reappraisal and its “fall-out”. Journal of Crustacean Biology, 27 (1), 97–115.
Miers, E.J. (1879) On a collection of Crustacea made by Capt. H.C. St. John, R.N., in the Corean and Japanese Seas. Part I. Podophthalmia. With an appendix by Capt. H.C. St. John. Proceedings of the Zoological Society of London for the year 1879, 18–61.
Milne-Edwards, A. (1880) Report on the results of dredging, under the supervision of Alexander Agassiz, in the Gulf of Mexico, and in the Caribbean Sea, 1877, 78, 79, by the United States Coast Survey steamer “Blake”, Lieut.-Commander C.D. Sigsbee, U.S.N., and Commander J.R. Bartlett, U.S.N., commanding. VIII. Études préliminaires sur les Crustacés. Bulletin of the Museum of Comparative Zoology, Harvard College, 8 (1), 1–68.
Milne-Edwards, A. & Bouvier. E.-L. (1893) Reports on the results of dredging under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877–78), in the Caribbean Sea (1878–79), and along the Atlantic coast of the United States (1880), by the U.S. Coast Survey Steamer “Blake”, Lieut.-Com. S.D. Sigsbee, U.S.N., and Commander J.R. Bartlett, U.S.N., Commanding. 33. Description des Crustacés de la famille des Paguriens recueillis pendant l’Expédition. Memoirs of the Museum of Comparative Zoology, Harvard College, 14 (3), 1–172.
Milne-Edwards, A. & Bouvier. E.-L. (1894) Considérations générales sur la famille des Galathéidés. Annales des Sciences Naturalles, Zoologie et Paléontologie, 16, 191–327.
Miyake, S. (1978) The crustacean Anomura of Sagami Bay: 1–200 (English), 1–161 (Japanese). Biological Laboratory, Imperial Household, Tokyo.
Ortmann, A. (1892) Die Decapoden-Krebse des Strassburger Museum, mit besonderer Berücksichtigung der von Herrn Dr. Doederlein bei Japan und bei den Liu-Kiu-Inseln gesammelten und zur Zeit im Strassburger Museum aufbewahrten Formen. IV. Die Abtheilungen Galatheidea und Paguridea. Zoologishen Jahrbüchern. Abtheilung für Systematik, Geographie und Biologie der Thiere, 6, 241–326.
Page, R.D.M. (1996) TreeMap. Software available from author.
Pike, R.B. (1947) Galathea. Liverpool Marine Biology Committee Memoirs, 34, i–viii, 1–138.
Pilgrim, R.L.C. (1973) Axial skeleton and musculature in the thorax of the hermit crab, Pagurus bernhardus [Anomura: Paguridae]. Journal of the Marine Biological Association of the United Kingdom, 53, 363–396.
Poore, G.C.B. (1994) A phylogeny of the families of Thalassinidea (Crustacea: Decapoda) with keys to families and genera. Memoirs of the Museum of Victoria, 54, 79–120.
Porter, M.L., Pérez-Losada, M. & Crandall, K.A. (2005) Model-based multi-locus estimation of decapod phylogeny and divergence times. Molecular Phylogenetics and Evolution, 37, 355–369.
Powar, C.B. (1969) Musculature of the eyestalk in Crustacea. Acta Zoologica, 50, 127–141.
Richter, S. & Scholtz, G. (1994) Morphological evidence for a hermit crab ancestry of lithodids (Crustacea, Decapoda, Anomala, Paguroidea). Zoologischer Anziger, 223 (5/6), 187–219.
Sandberg, L. & McLaughlin, P.A. (1998). Paguridea. Marine Invertebrates of Scandinavia, 10, 1–113.
Scholtz, G. & Richter, S. (1995) Phylogenetic systematics of the reptantian Decapoda (Crustacea, Malacostraca). Zoological Journal of the Linnean Society, 113, 289–328.
Schram, F.R. & Dixon, C. (2003) Fossils and decapod phylogeny. Contributions to Zoology, 72 (2–3), 169–172.
Snodgrass, R.E. (1952) The sand crab Emerita talpoida (Say) and some of its relatives. Smithsonian Miscellaneous Collections, 117 (8), 1–34.
Stebbing, T.R.R. (1914) South African Crustacea (Part VII of S.A. Crustacea, for the Marine Investigations in South Africa). Annals of the South African Museum, 15, 1–55.
Strong, E.E. & Lipscomb, D. (1999) Character coding and inapplicable data. Cladistics, 15 (4), 363–371.
Tsang, L.M., Ma, K.Y., Ahyong, S.T. Chan, T.-Y. & Chu, K.H. (2008) Phylogeny of Decapoda using two nuclear protein-coding genes: Origin and evolution of the Reptantia. Molecular Phylogenetics and Evolution, 48, 359–368.
Walker-Smith, G.K. & Poore, G.C.B. (2001) A phylogeny of the Leptostraca (Crustacea) with keys to the families and genera. Memoirs of Museum Victoria, 58 (2), 383–410.
Wilkinson, M. (1995) A comparison of two methods of character construction. Cladistics, 11, 297–308.