Abstract
Two new cyclopoid species belonging to the genus Halicyclops Norman, 1903 are described from brackish waters in South Korea: H. lanceolatus sp. nov. and H. pumilus sp. nov. Halicyclops lanceolatus was collected from two river mouths, both connected to caves. It belongs to the thermophilus group in showing 3,4,4,3 spine formula on legs 1-4 and lateral process on the genital double-somite. Among the members of the species group, it is closely allied with H. thermophilus Kiefer, 1929 and H. uncus Ueda and Nagai, 2009. However, it differs from them by a stout, lanceolate inner apical spine on leg 5 exopod, very short lateral process of the genital double-somite, short caudal rami, and shorter inner apical spine on the third endopodal segment of leg 4. Halicyclops pumilus was collected from interstitial waters of estuarine sandy beaches, and it is characteristic in having a single inner seta on the second endopodal segments of legs 2-3, and quadrate shape of leg 5 exopod with stumpy spines.
References
Baribwegure, D. & Dumont, H.G. (2000) Some freshwater cyclopids (Crustacea: Copepoda) of the island of Soqotra (Indian Ocean), with the description of three new species. International Review of Hydrobiology, Weinheim, 85(4), 471–489.
Boxshall, G. (2011) Halicyclops Norman, 1903. In: Walter, T.C. & Boxshall, G. (ed) (2011) World Copepoda database. Accessed through: http://www.marinespecies.org/copepoda/aphia.php?p=taxdetails&id=106433 on 2011-12-22.
Chang, C.Y. (2009) Illustrated Encyclopedia of Fauna & Flora of Korea. Vol. 42. Inland-water Copepoda. Jeonghaengsa Publ. Co., Seoul, 687 pp.
Chang, C.Y. (2012) Discovery of Halicyclops continentalis (Cyclopidae, Halicyclopinae) from estuaries and salt marshes on the west coast of South Korea. Animal Systematics, Evolution, and Diversity, 28, 12–19.
Chang, C.Y. & Min G.-S. (2005) Key to the Korean freshwater cyclopoid copepods and their DNA taxonomy. Junghaeng-Sa Publishing Co., Seoul,153 pp.
Herbst, H.V. (1983) Amsterdam expeditions to the West Indian Islands, report 32. Ein neuer Copepode (Cyclopoida: Gnathostoma) von den westindischen Inseln: Halicyclops antiguaensis n. sp. Bijdragen tot de Dierkunde, 53, 262–266.
Huys, R. & Boxshall, G.A. (1991) Copepod evolution. The Ray Society, London, 468 pp.
Ito, T. (1956) Three new copepods from brackish-water lakes of Japan. Pacific Science, 10(4), 468–473.
Karanovic, T. (2008) Marine interstitial Poecilostomatoida and Cyclopoida (Copepoda) of Australia. Crustaceana Monographs, 9. Brill, Leiden, 332 pp.
Lotufo, G.R. & Rocha, C.E.F. (1993) Intertidal interstitial Halicyclops from the Brazilian coast (Copepoda: Cyclopoida). Hydrobiologia, 264, 175–184.
Pesce, G.L. (2011) Cyclopoida: Halicyclopinae Kiefer, 1927: Halicyclops A. M. Norman, 1903. Accessed through: Copepod Web Portal at http://www.luciopesce.net/ copepods/halicyc.htm on 2011-10-21.
Pleşa, C. (1961) New cyclopoids (Crustacea, Copepoda) of the interstitial fauna from the beaches of Ghana. Journal of the West African Science Association, 7(1), 1–13.
Shen, C.J. & Tai, A.Y. (1964) Descriptions of new species of freshwater Copepoda from Kwangtung Province, South China. Acta Zootaxonomica Sinica, 1, 367–396.
Shirayama, Y., Kaku, T. & Higgins, R.P. (1993) Double-sided microscopic observation of meiofauna using an HS-slide. Benthos Research, 44, 41–44.
Ueda, H. & Nagai, H. (2009) Three new species of the brackish-water copepod Halicyclops (Crustacea, Cyclopoida) from Ariake Bay, Japan. Journal of Natural History, 43, 287–307.
Yoo, K.I. & Lim B.J. (1989) Systematic studies on the freshwater Copepoda (Crustacea) in Lake Yongsan, Korea. Korean Journal of Limnology, 22, 127–146.
Yoon, H.J. & Chang, C.Y. (2008) Two brackish cyclopoid copepods from southern coast of Korea. Korean Journal of Systematic Zoology, 24, 241–250.