Abstract
Two new species, Cleantiella ampliscutula sp. nov. and Pentias pluriarticulatus sp. nov., are reported from Korean waters with keys to all known species of the genera Cleantiella and Pentias. Cleantiella ampliscutula sp. nov. can be distinguished from its congeners by the following characteristics: the body is relatively small; pereonite 1 is expanded anterolaterally; coxal plates 2–7 are triangular; the pleon has three partial sutures; the pleotelson is widening posteriorly on the lateral margin; the flagellum of the antenna is single-articled; and the maxillipedal palps are four-articled. Pentias pluriarticulatus sp. nov. can be distinguishable from its congeners by the following characteristics: the lateral margins of the body are parallel; the anterior margin of the cephalon is slightly concave and has a small median notch; the coxal plates are invisible dorsally on pereonites 2–4, but visible on pereonites 5–7; the pleon has three partial sutures; the flagellum of the antenna is composed of nine articles; and the distal ends of the uropodal endopods are sinuous.
References
Boyko, C.B., Bruce, N.L., Hadfield, K.A., Merrin, K.L., Ota, Y., Poore, G.C.B., Taiti, S., Schotte, M. & Wilson, G.D.F. (Eds.) (2008 onwards) World Marine, Freshwater and Terrestrial Isopod Crustaceans database. Available from: http://www.marinespecies.org/isopoda/aphia.php?p=taxdetails&id=118283 (accessed 9 September 2020)
Collinge, W.E. (1916) Description of a new species of Marine Isopoda of the genus Pentias, Richardson. Journal of Zoological Research, 1, 33–35.
https://doi.org/10.1111/j.1096-3642.1916.tb00257.x
Kussakin, O.G. (1974) Fauna and ecology of isopods (Crustacea) from the intertidal zone of the Kurile Islands. In: Flora and fauna of the intertidal zone of the Kurile Islands. Nauka, Novosibirsk, pp. 227–275.
Kussakin, O.G. (1982) Marine and brackish-water Crustacea (Isopoda) of cold and temperate waters of the Northern Hemisphere. Suborders Anthuridea, Microcereberidea, Valvifera, Tyloidea. National Academy of Sciences, U.S.S.R., Zoology (Opredeliteli po Faune SSR, Akademiya Nauk, SSSR), 131, 1–461. [in Russian]
Kwon, D.H. (1986) Some idoteid isopods (Crustacea) from Korea. Inje journal, 2, 107–121.
Miers, E.J. (1881) Revision of the Idoteidæ, a family of sessile-eyed Crustacea. Zoological Journal of the Linnean Society, 16, 1–88.
https://doi.org/10.1111/j.1096-3642.1881.tb02274a.x
Nierstrasz, H.F. (1941) Die Isopoden der Siboga-Expedition. IV Isopoda Genuina. III. Gnathiidea, Anthuridea, Valvifera, Asellota, Phreatocoidea. Siboga-Expedition, 32d, 235–306.
Nunomura, N. (2006) Marine isopod crustaceans in the Sagami Sea, central Japan. Memoirs of the National Science Museum, 41, 1–42.
Poore, G.C.B. (2001) Isopoda Valvifera: diagnoses and relationships of the families. Journal of Crustacean Biology, 21, 205–230.
https://doi.org/10.1163/20021975-99990118
Poore, G.C.B & Hurley, D.E. (2015) Takereana, a new genus of Idoteidae (Crustacea: Isopoda: Valvifera) from New Zealand. Zootaxa, 4057 (4), 590–594.
https://doi.org/10.11646/zootaxa.4057.4.10
Poore, G.C.B. & Ton, H.L. (1990) The Holognathidae (Crustaea: Isopoda: Valvifera) expanded and redefined on the basis of body-plan. Invertebrate Systematics, 4 (1), 55–80.
https://doi.org/10.1071/it9900055
Rafi, F. (1973) A new species of the genus Pentias Richardson (Isopoda, Valvifera) from the Sea of Japan. Canadian Journal of Zoology, 51, 1041–1045.
https://doi.org/10.1139/z73-151
Richardson, H. (1904) Contributions to the natural history of the Isopoda. Proceedings of the United States National Museum, 27, 1–89.
https://doi.org/10.5479/si.00963801.27-1350.113
Richardson, H. (1909) Isopods collected in the northwest Pacific by the US Bureau of Fisheries Steamer" Albatross" in 1906. Proceedings of the United States National Museum, 37, 75–129.
https://doi.org/10.5479/si.00963801.37-1701.75
Song, J.H. & Min, G.S. (2015) New report of two species of genus Pentias (Crustacea: Malacostraca: Isopoda) from South Korea. Korean Journal of Environmental Biology, 33, 177–181.
https://doi.org/10.11626/KJEB.2015.33.2.177
Thielemann, M. (1910) Beiträge zur Naturgeschichte Ostasiens. Abhandlungen der Mathematisch-Physikalischen Klasse der Köeniglich Bayerischen Akademie der Wissenschaft Supplementarischer, Supplement 2, 1–109.