Abstract
The earliest information on Sri Lankan echinoid species belonging to the Irregularia dates back to Alexander Agassiz (1872). However, the current knowledge of diversity and distribution of irregular echinoids from Sri Lanka (formerly Ceylon) remains sparse. In addition, there are no recent taxonomic studies or biodiversity surveys for irregular echinoids, and no illustrated field-guides or reference collections are available specifically for Sri Lanka. To address these gaps, left open for more than 100 years since the work of Clark (1915), this study was conducted as an island-wide systematic sampling survey. Over 200 echinoid specimens were collected from 24 localities in Sri Lankan coastal waters by snorkelling and SCUBA diving down to 33 m depth. The collected specimens were identified using existing keys and authenticated with specimens available at the Natural History Museum in Vienna, Austria. The present study records 22 irregular echinoid species belonging to 15 genera and nine families in four orders. Among the identified irregular echinoids, six species, Echinocyamus megapetalus H.L. Clark, 1914, Fibularia ovulum Lamarck, 1816, Fibulariella angulipora Mortensen, 1948, Echinodiscus cf. truncatus L. Agassiz, 1841, Peronella oblonga Mortensen, 1948 and Brissus cf. agassizii Döderlein, 1885, are new records for Sri Lanka. Four unidentified, possibly new species belonging to the genera Fibularia, Jacksonaster and Metalia are reported, but kept in open nomenclature until more material becomes available. At present, the diversity of irregular echinoids from Sri Lanka now stands at 37 species representing 11 families in four orders. A dichotomous key is presented for all Sri Lankan irregular echinoids.
References
Agassiz, A. (1872–1874) Revision of the Echini. Illustrated Catalogue of the Museum of Comparative Zoölogy at Harvard College, 7 (Pt. 1–2, 3 & 4) i–xii + 1–378, pls. 1–49 (1872), 379–628 + 1, pls. 50–77 (1873) & 629–762, pls. 78–94 (1874).
Agassiz, L. (1841) Monographies d'Échinodermes vivans et fossiles. Échinites. Famille des Clypéasteroides. 2 (Seconde Monographie). Des Scutelles, Neuchâtel, iv + 151 pp., 27 pls.
https://doi.org/10.5962/bhl.title.126954Agassiz, L. & Desor, P.J.E. (1847) Catalogue raisonné des espèces, des genres, et des familles d'échinides. Annales des Sciences Naturelles, Troisième Série, Zoologie 7, 129–168.
Appeltans, W., Ahyong, S.T., Anderson, G., Angel, M.V., Artois, T., Bailly, N., Bamber, R., Barber, A., Bartsch, I., Berta, A., Błazewicz-Paszkowycz, M., Bock, P., Boxshall, G., Boyko, C.B., Brandão, S.N., Bray, R.A., Bruce, N.L., Cairns, S.D., Chan, T.Y., Cheng, L., Collins, A.G., Cribb, T., Curini-Galletti, M., Dahdouh-Guebas, F., Davie, P.J.F., Dawson, M.N., de Clerck, O., Decock, W., de Grave, S., de Voogd, N.J., Domning, D.P., Emig, C.C., Erséus, C., Eschmeyer, W., Fauchald, K., Fautin, D.G., Feist, S.W., Fransen, C.H.J.M., Furuya, H., Garcia-Alvarez, O., Gerken, S., Gibson, D., Gittenberger, A., Gofas, S., Gómez-Daglio, L., Gordon, D.P., Guiry, M.D., Hernandez, F., Hoeksema, B.W., Hopcroft, R.R., Jaume, D., Kirk, P., Koedam, N., Koenemann, S., Kolb, J.B., Kristensen, R.M., Kroh, A., Lambert, G., Lazarus, D.B., Lemaitre, R., Longshaw, M., Lowry, J., MacPherson, E., Madin, L.P., Mah, C., Mapstone, G., McLaughlin, P.A., Mees, J., Meland, K., Messing, C.G., Mills, C.E., Molodtsova, T.N., Mooi, R., Neuhaus, B., Ng, P.K.L., Nielsen, C., Norenburg, J., Opresko, D.M., Osawa, M., Paulay, G., Perrin, W., Pilger, J.F., Poore, G.C.B., Pugh, P., Read, G.B., Reimer, J.D., Rius, M., Rocha, R.M., Saiz-Salinas, J.I., Scarabino, V., Schierwater, B., Schmidt-Rhaesa, A., Schnabel, K.E., Schotte, M., Schuchert, P., Schwabe, E., Segers, H., Self-Sullivan, C., Shenkar, N., Siegel, V., Sterrer, W., Stöhr, S., Swalla, B., Tasker, M.L., Thuesen, E. V., Timm, T., Todaro, M.A., Turon, X., Tyler, S., Uetz, P., Van Der Land, J., Vanhoorne, B., Van Ofwegen, L.P., Van Soest, R.W.M., Vanaverbeke, J., Walker-Smith, G., Walter, T.C., Warren, A., Williams, G.C., Wilson, S.P. & Costello, M.J. (2012) The magnitude of global marine species diversity. Current Biology, 22, 2189–2202.
https://doi.org/10.1016/j.cub.2012.09.036
Arachchige, G.M., Jayakody, S., Mooi, R. & Kroh, A. (2017) A review of previous studies on the Sri Lankan echinoid fauna, with an updated species list. Zootaxa, 4231 (2), 151–168.
https://doi.org/10.11646/zootaxa.4231.2.1Askin, R. & Mooi, R. (2017) The heart of the problem: Phylogenetic systematics of burrowing sea urchins in the genus Metalia (Echinoidea: Spatangoida). Integrative and Comparative Biology, 57 (Supplement 1), e7.
Bell, F.J. (1882) Note on the echinoderm-fauna of the island of Ceylon, together with some observations on heteractinism, XIX. Annals and Magazine of Natural History, Series 5, 10, 218–225.
https://doi.org/10.1080/00222938209459697Bell, F.J. (1884) Echinodermata. Report on the zoological collections made in the Indo-Pacific Ocean during the voyage of H.M.S. “Alert”, London, 1881–2, 117–177, 509–512, pls. 8–17 & 45.
Bell, F.J. (1887a) The echinoderm fauna of the island of Ceylon. Scientific Transactions of the Royal Dublin Society, 3, 643–658.
Bell, F.J. (1887b) Report on a collection of Echinodermata from the Andaman Islands. Journal of Zoology, 55, 139–145.
https://doi.org/10.1111/j.1096-3642.1887.tb02953.xBell, F.J. (1888) Report on a collection of echinoderms made at Tuticorin, Madras, by Mr. Edgar Thurston, C.M.Z.S., Superintendent, Government Central Museum, Madras. Proceedings of the Zoological Journal of London, 1888, 383–389.
https://doi.org/10.1111/j.1469-7998.1888.tb06719.xBell, F.J. (1909) Report on the Echinoderma (other than holothurians) collected by Mr. Stanley Gardiner in the western parts of the Indian Ocean. Transactions of the Linnaean Society of London, Zoology, 13, 12–22.
https://doi.org/10.1111/j.1096-3642.1909.tb00406.xBrown, R.N.R. (1910a) Echinoidea from the Kerimba Archipelago, Portuguese East Africa (Mozambique). Edinburgh Proceedings of the Royal Physical Society, 18, 36–44.
Brown, R.N.R. (1910b) Echinoidea and Asteroidea from, the Mergui. Archipelago and Moskos Islands, Lower Burma. Edinburgh Proceedings of the Royal Physical Society, 18, 21–35.
Chang, F.Y. & Wu, B.L. (1957) The echinoids of Kwangtung Province. Bulletin of the Institute of Marine Biology, Academia Sinica, 1, 1–80.
Clark, A.H. (1949) Some littoral sea-urchins from the Philippines. Journal of the Washington Academy of Sciences, 39, 271–272.
Clark, A.H. (1950) Echinoderms from the Cocos-Keeling Islands. Bulletin of the Raffles Museum, 22, 53–67.
Clark, A.H. (1954) Records of Indo-Pacific echinoderms. Pacific Science, 8, 243–263.
Clark, A.M.G. & Rowe, F.W.E. (1971) Monograph of Shallow-water Indo-West Pacific Echinoderms. British Museum Natural History Publications, London, 238 pp.
Clark, H.L. (1914) Hawaiian and other Pacific Echini—the Clypeasteridae, Arachnoididae, Laganidae, Fibulariidae, and Scutellidae. Memoirs of the Museum of Comparative Zoology, 46, 1–78.
Clark, H.L. (1915) The echinoderms of Ceylon other than holothurians. Spolia Zeylanica, 10, 83–102.
Clark, H.L. (1917) Hawaiian and other Pacific Echini, Echinoneidae, Nucleolitidae, Urechinidae, Echinocorythidae, Calymnidae, Pourtalesiidae, Palaestomatidae, Aeropsidae, Palaeopneustidae, Hemiasteridae, and Spatangidae. Memoirs of the Museum of Comparative Zoology at Harvard College, 46, 81–283.
Clark, H.L. (1923) The Echinoderm fauna of South Africa. Annals of the South African Museum, 13, 221–435.
Clark, H.L. (1925a) A Catalogue of the Recent Sea-Urchins (Echinoidea) in the Collection of the British Museum (Natural History). Oxford University Press, London, 250 pp.
Clark, H.L. (1925b) Marine zoology of tropical central Pacific: Echinoderms other than sea-stars. Bulletin of the Bernice Pauahi Bishop Museum, 27, 89–111.
Clark, H.L. (1938) Echinoderms from Australia. Memoirs of the Museum of Comparative Zoology of the Harvard College, 55, 1–596.
Clark, H.L. (1946) The echinoderm fauna of Australia. Its composition and its origin. Carnegie Institution of Washington Publication, 566, 1–567.
De Loriol, P. (1883) Catalogue raisonné des Echinodermes recueillis par MV de Robillard à l'île Maurice. Mémoires de la Société de physique et d'histoire naturelle de Genève, 28, 1–64.
Döderlein, L. (1885) Seeigel von Japan und den Liu-Kiu Inseln. Archiv für Naturgeschichte, 51, 73–112.
https://doi.org/10.5962/bhl.part.1569Döderlein, L. (1888) Echinodermen von Ceylon. Bericht über die von den Herren Dres Sarasin gesammelten Asteroidea, Ophiuroidea und Echinoidea. Zoologische Jahrbücher, Abteilung für Systematik, Geographie und Biologie der Tiere, 3, 821–846.
https://doi.org/10.5962/bhl.part.1933ESRI (2014) ArcGIS Desktop: Release 10.2.2. Environmental Systems Research Institute, Redlands, CA.
Fernando, M. (2006) Coral associated invertebrates: An overview of the current taxonomic status. In: Bambaradeniya, C.N.B. (Ed.), The Fauna of Sri Lanka, Section 3: Status of Marine Fauna in Sri Lanka. IUCN—The World Conservation Union, Gland, pp. 259–273.
Fourtau, R. (1904) Contribution a l'étude des Echinides vivant dans le Golfe de Suez. Bulletin de l'Institut Egyptien, IV, Série, 5, 407–446.
Ghiold, J. (1989) Species Distributions of Irregular Echinoids. Biological Oceanography, 6, 79–162.
Herdman, W.A., Herdman, J.B. & Bell, F.J. (1904) Report on the Echinoderma collected by Professor Herdman, at Ceylon, in 1902. In: Herdman, W.A. (Ed.), Report to the government of Ceylon on the pearl oyster fisheries of the Gulf of Mannar. The Royal Society, London, pp. 137–150.
Koehler, R. (1914) Echinoderma of the Indian Museum, Part 8, An Account of the Echinoidea I. Spatangidés. Trustees of the Indian Museum, Calcutta, 258 pp.
Koehler, R. (1922) Echinoderma of the Indian Museum, Part 9, An account of the Echinoidea. II. Clypeastridés et Cassidulidés. Trustees of the Indian Museum, Calcutta, 161 pp.
Kroh, A. & Mooi, R. (2017) World Echinoidea Database. Available from: http://www.marinespecies.org/echinoidea (accessed 5 August 2017)
Kroh, A. & Smith, A.B. (2010) The phylogeny and classification of post-Palaeozoic echinoids. Journal of Systematic Palaeontology, 8, 147–212.
https://doi.org/10.1080/14772011003603556Loriol, P. de (1875) Note sur quelques espèces nouvelles appartenant a la classe des Échinodermes. Mémoires de la Société de Physique et d'Histoire Naturelle de Genève, 24, 659–673.
Lovén, S. (1872) On the structure of the Echinoidea. Annals and Magazine of Natural History, 10, 285–298.
https://doi.org/10.1080/00222937208696699Markello, K.M. (2015) Phylogenetic revision of the micro-echinoid genus, Echinocyamus. San Francisco State University, San Francisco, California, 308 pp.
de Meijere, J.C.H. (1904) Die Echinoidea der Siboga-Expedition. Siboga Expeditie, 43, 1–252.
Miskelly, A. (2002) Sea urchins of Australia and the Indo-Pacific. Capricornica Publications, Lindfield, 179 pp.
Mooi, R. (1990) Living cassiduloids (Echinodermata: Echinoidea): A key and annotated list. Proceedings of the Biological Society of Washington, 1990, 63–85.
Mooi, R. & Munguia, A. (2014) Sea Urchins of the Philippines. In: Williams, G.C. & Terrence, M.G. (Eds.), The Coral Triangle: The 2011 Hearst Philippine Biodiversity Expedition. California Academy of Sciences, San Francisco, California, pp. 213–235.
Mortensen, T. (1940) Echinoderms from the Iranian Gulf. Asteroidea, Ophiuroidea, and Echinoidea. Danish Scientific Investigations in Iran, Part 2, 55–112.
Mortensen, T. (1948a) A Monograph of the Echinoidea IV. 1. Holectypoida, Cassiduloida. C. A. Reitzel, Copenhagen, 371 pp.
Mortensen, T. (1948b) A Monograph of the Echinoidea IV. 2. Clypeasteroida. Clypeasteridæ, Arachnoidæ, Fibulariidæ, Laganidæ and Scutellidæ. C.A. Reitzel, Copenhagen, 471 pp.
Mortensen, T. (1948c) Report on the Echinoidea of the Murray Expedition. II [Irregular Echinoidea]. Scientific Reports on the John Murray Expedition, 9, 1–15.
Mortensen, T. (1948d) New Echinoidea (Cassiduloida, Clypeasteroida): Preliminary notice. Videnskabelige Meddelelser fra Dansk naturhistorisk Forening i København, 111, 67–72.
Mortensen, T. (1948e) Contributions to the Biology of the Philippine Archipelago and adjacent regions. Report on the Echinoidea collected by the United States Fisheries Steamer "Albatross" during the Philippine Expedition, 1907–1910. Part 3: The Echinoneidae, Echinolampidae, Clypeastridae, Arachnidae, Laganidae, Fibulariidae, Urechinidae, Echinocorythidae, Palaeostomatidae, Micrasteridae, Palaepneustidae, Hemiasteridae, and Spatangidae. Smithsonian Institution, United States National Museum Bulletin, 100, 93–140.
Mortensen, T. (1950) A Monograph of the Echinoidea V. 1. Spatangoida. I. Protosternata, Meridosternata, Amphisternata I. Palæopneustidae, Palæostomatidae, Aëropsidæ, Toxasteridæ, Micrasteridæ, Hemiasteridæ. C.A. Reitzel, Copenhagen, 432 pp.
Mortensen, T. (1951) A Monograph of the Echinoidea V. 2. Spatangoida. 2. Amphisternata. II. Spatangidæ, Loveniidæ, Pericosmidæ, Schizasteridæ, Brissidæ. C. A. Reitzel, Copenhagen, 593 pp.
Putchakarn, S. & Sonchaeng, P. (2004) Echinoderm fauna of Thailand: History and inventory reviews. Science Asia, 30, 417–428.
https://doi.org/10.2306/scienceasia1513-1874.2004.30.417Rowe, F.W.E. & Gates, J. (1995) Echinodermata. In: Wells, A. (Ed.), Zoological Catalogue of Australia. Vol. 33. CSIRO, Melbourne, pp. i–xiii + 1–510.
Samuel, V.K., Krishnan, P., Sreeraj, C.R., Chamundeeswari, K., Parthiban, C., Sekar, V., Patro, S., Saravanan, R., Abhilash, K.R., Ramachandran, P. & Ramesh, R. (2017) An updated checklist of Echinoderms from Indian waters. Zootaxa, 4354 (1), 3–68.
https://doi.org/10.11646/zootaxa.4354.1.1Sastry, D.R.K. (2007) Echinodermata of India, an annotated list. Records of the Zoological Survey of India. Occasional Paper, 271, 1–387.
Saucède, T., Mooi, R. & David, B. (2003) Combining embryology and paleontology: origins of the anterior-posterior axis in echinoids. Comptes Rendus Palevol, 2, 399–412.
https://doi.org/10.1016/j.crpv.2003.09.017Saucède, T., Mooi, R. & David, B. (2007) Phylogeny and origin of Jurassic irregular echinoids (Echinodermata: Echinoidea). Geological Magazine, 144, 333–359.
https://doi.org/10.1017/S0016756806003001Schultz, H. (2005) Sea Urchins: A Guide to Worldwide Shallow Water Species. Heinke & Peter Schultz Partner Scientific Publications, Hemdingen, 484 pp.
Schultz, H. (2009) Sea-Urchins II, Worldwide Irregular Deep Water Species. Heinke & Peter Schultz Partner Scientific Publications, Hemdingen, 849 pp.
Smith, A.B. & Kroh, A. (2011) The Echinoid Directory. World Wide Web electronic publication. Available from: http://www.nhm.ac.uk/research-curation/projects/echinoid-directory (accessed 5 August 2017)
Smith, A.B., Pisani, D., Mackenzie-Dodds, J.A., Stockley, B., Webster, B.L. & Littlewood, D.T.J. (2006) Testing the molecular clock: Molecular and paleontological estimates of divergence times in the Echinoidea (Echinodermata). Molecular Biology and Evolution, 23, 1832–1851.
https://doi.org/10.1093/molbev/msl039Stara, P. & Fois, M. (2014) Analysis on a sample of Echinodiscus cf. auritus Leske, 1778 (Echinoidea: Clypeasteroida), Biodiversity Journal, 5, 269–290.
Stara, P. & Sanciu, L. (2014) Analysis of some astriclypeids (Echinoidea: Clypeasteroida). Biodiversity Journal, 5, 291–358.
van Noordenburg, H. (2008) Sea Urchins of the Philippines. Part I. The Irregulars. Artificial Harmonics, Utrecht, 153 pp.
Walter, A. (1885) Ceylons Echinodermen. Jenaische Zeitschrift für Naturwissenschaft Herausgegeben von der Medicinisch-Naturwissenschaftlichen Gesellschaft zu Jena, 18, 365–384.