Abstract
We propose and describe a new genus of interstitial Paramesochridae, Maliithipon gen. nov., to accommodate three species. Maliithipon wellsi sp. nov., type species of the genus, is described based on specimens collected in two sandy beaches in Isla Verde, the Philippines. Apodopsyllus aberrans Mielke, 1984a described from Panama, is allocated to the herein erected genus as Maliithipon aberrans (Mielke, 1984a) comb. nov. Maliithipon cf. aberrans is described, based on specimens collected in the Azores and previously identified as Apodopsyllus aberrans. The new genus is characterized by several distinct morphological features: mandible with uniramous, 2-segmented palp and gnathobase with thin and pointed teeth; maxillule with reduced armature, lacking endopod and exopod; maxilla large, with three syncoxal endites and endopod with reduced setal number; P5 very reduced in both sexes; caudal rami with six setae, two of which (setae III and VI) transformed; pseudoperculum well-developed, with four-lobed distal margin. The new genus is included in the subfamily Paramesochrinae Lang, 1944 and in the genus-group Scottopsyllus (sensu Huys, 1987). It has strong affinities with Leptopsyllus (Leptopsyllus) platyspinosus Mielke, 1984b and Wellsopsyllus (Intermediopsyllus) smirnovi (Kunz, 1992), which are considered as species inquirendae in this paper. Some remarks on the ecology and geonemy of the three studied species are provided. We also list the accompanying Paramesochridae obtained from the two new collecting sites of the genus, and all the genera of Paramesochridae recorded from other sites in the Philippines during the same survey.
References
Amorri, J., Veit-Köhler, G., Drewes, J. & Aïssa, P. (2010) Apodopsyllus gabesensis n. sp.: a new species of Paramesochridae (Copepoda: Harpacticoida) from the Gulf of Gabès (south-eastern Tunisia). Helgoland marine Research, 64, 191–203. https://doi.org/10.1007/s10152-009-0178-3
Apostolov, A. & Marinov, T.M. (1988) Copepoda Harpacticoida (morski kharpaktikoidi). [Copepoda, Harpacticoida (marine harpacticoids)]. Fauna Bolgarii [Fauna Bulgarica], 18, 1–384. [In Bulgarian]
Back, J. & Lee, W. (2017a) Two new species of Leptopsyllus from Korea (Copepoda, Harpacticoida, Paramesochridae). ZooKeys, 665, 37–57. https://doi.org/10.3897/zookeys.665.6150
Back, J. & Lee, W. (2017b) Two new species of the genus Emertonia Wilson, 1932 from Korean waters (Copepoda, Harpacticoida, Paramesochridae). ZooKeys, 718, 35–64. https://doi.org/10.3897/zookeys.718.19959
Boxshall, G.A. & Halsey, S.H. (2004) An Introduction to Copepod Diversity. The Ray Society, London, 966 pp.
Božić, B. (1964) Tisbisoma spinisetum n. gen., n. sp., Copépode Harpacticoïde de la Réunion. Bulletin de la Société zoologique de France, 89, 219–225.
Brancelj, A. (2006) The epikarst habitat in Slovenia and the description of a new species. Journal of natural History, 40, 403–413. https://doi.org/10.1080/00222930600646608
Brancelj, A. (2009) Fauna of an unsaturated karstic zone in Central Slovenia: two new species of Harpacticoida (Crustacea: Copepoda), Elaphoidella millennii n. sp. and E. tarmani n. sp., their ecology and morphological adaptations. Hydrobiologia, 621, 85–104. https://doi.org/10.1007/s10750-008-9634-3
Cottarelli, V., Bruno, M.C., Spena, M.T. & Grasso, R. (2012) Studies on subterranean copepods from Italy, with descriptions of two new epikarstic species from a cave in Sicily. Zoological Studies, 51, 556–82.
Cottarelli, V. & Forniz, C. (1994) Meiopsyllus marinae: a new genus and a new species of Paramesochridae from the meiobenthos of Asinara and S. Pietro Islands (Sardinia). Annali Museo Civico Storia naturale Giacomo Doria, 90, 577–589.
Delamare Deboutteville, C. (1960) Biologie des eaux souterraines littorales et continentales. Hermann, Paris, 740 pp.
Galassi, D.M.P. & De Laurentiis, P. (2004) Towards a revision of the genus Parastenocaris Kessler, 1913: establishment of Simplicaris gen. nov. from groundwaters in central Italy and review of the P. brevipes-group (Copepoda, Harpacticoida, Parastenocarididae). Zoological Journal of the Linnean Society, 140, 417–436. https://doi.org/10.1111/j.1096-3642.2003.00107.x
Galassi, D.M.P., Huys, R. & Reid, J.W. (2009) Diversity, ecology and evolution of groundwater copepods. Freshwater Biology, 54, 691–708. https://doi.org/10.1111/j.1365-2427.2009.02185.x
Giere, O. (2009) Meiobenthology. The Microscopic Motile Fauna of Aquatic Sediments. 2nd Edition. Springer-Verlag, Berlin and Heidelberg, 548 pp.
Huys, R. (1987) Paramesochra Scott, T. 1892 (Copepoda, Harpacticoida) – a revised key, including a new species from the SW Dutch coast and some remarks on the phylogeny of the Paramesochridae. Hydrobiologia, 144, 193–210. https://doi.org/10.1007/BF00005554
Huys, R. (1995) A new genus of Paramesochridae (Copepoda: Harpacticoida) from Amphioxus-sand, Elat, Israel. Journal of natural History, 29, 673–684. https://doi.org/10.1080/00222939500770231
Huys, R. (1996) Biuncus nom. nov., a replacement name for Singularia Huys, 1995 (Copepoda: Harpacticoida: Paramesochridae). Journal of natural History, 30, 1261. https://doi.org/10.1080/00222939600770691
Huys, R. (2009) Unresolved cases of type fixation, synonymy and homonymy in harpacticoid copepod nomenclature (Crustacea: Copepoda). Zootaxa, 2183 (1), 1–99. https://doi.org/10.11646/zootaxa.2183.1.1
Huys, R., Gee, J.M., Moore, C.G. & Hamond, R. (1996) Synopses of the British Fauna (New Series) No. 51. Marine and brackish water harpacticoid copepods. Part 1. Field Studies Council, Shrewsbury, 352 pp.
Klie, W. (1929) Die Copepoda Harpacticoida der südlichen und westlichen Ostsee mit besonderer Berücksichtigung der Sandfauna der Kieler Bucht. Zoologische Jahrbücher, Systematik, 57, 329–386.
Klie, W. (1949) Harpacticoida (Cop.) aus dem Bereich von Helgoland und der Kieler Bucht. 1. Kieler Meeresforschungen, 6, 1–40.
Kottmann J., Kihara, T.C., Glatzel, T. & Veit-Köehler, G. (2013) A new species of Wellsopsyllus (Copepoda, Harpacticoida, Paramesochridae) from the deep Southern Ocean and remarks on its biogeography. Helgoland marine Research, 67, 33–48. https://doi.org/10.1007/s10152-012-0302-7
Kunz, H. (1962) Revision der Paramesochridae (Crust. Copepoda). Kieler Meeresforschungen, 18, 245–257.
Kunz, H. (1975) Copepoda Harpacticoida aus dem Litoral des südlichen Afrika. I. Teil. Kieler Meeresforschungen, 31, 179–212.
Kunz, H. (1981) Beitrag zur Systematik der Paramesochridae (Copepoda, Harpacticoida) mit Beschreibung einiger neuen Arten. Mitteilungen aus dem Zoologischen Museum der Universität Kiel, 1 (8), 2–33.
Kunz, H. (1992) Beitrag zur Kenntnis mariner Copepoda Harpacticoida (Fam. Paramesochridae Lang) mit Beschreibung zweier neuer Arten und einer neuen Unterart. Crustaceana, 62, 85–97. https://doi.org/10.1163/156854092X00073
Lang, K. (1944) Monographie der Harpacticiden (Vorläufige Mitteilung). Almqvist & Wiksells, Uppsala, 39 pp.
Mielke, W. (1984a) Einige Paramesochridae (Copepoda) von Panama. Spixiana, 7, 217–243.
Mielke, W. (1984b) Interstitielle Fauna von Galapagos. XXXI. Paramesochridae (Harpacticoida). Microfauna marina, 1, 63–147.
Packmor, J. & George, K.H. (2016) Littoral Harpacticoida (Crustacea: Copepoda) of Madeira and Porto Santo (Portugal). Journal of the marine biological Association of the United Kingdom, 98, 171–182. https://doi.org/10.1017/S0025315416001168
Packmor, J., Müller, F. & George, K.H. (2015) Oceanic islands and seamounts as staging posts for Copepoda Harpacticoida (Crustacea)—Shallow-water Paramesochridae Lang, 1944 from the North-East Atlantic Ocean, including the redescription of three species and one subspecies from the Madeiran Archipelago. Progress in Oceanography, 131, 59–81. https://doi.org/10.1016/j.pocean.2014.11.012
Sars, G.O. (1903) Copepoda Harpacticoida. Parts I & II, Misophriidæ, Longipediidæ, Cerviniidæ, Ectinosomidæ (part). An account of the Crustacea of Norway, with short Descriptions and Figures of all the Species, 5, 1–28, pls. I–XVI.
Scott, T. (1892) Additions to the fauna of the Firth of Forth. Part IV. Reports of the Fishery Board for Scotland, Edinburgh, 10 (3), 244–272.
Scott, T. (1894) Additions to the fauna of the Firth of Forth. Part VI. Reports of the Fishery Board for Scotland, Edinburgh, 12 (3), 231–271.
Soyer, J. (1975) Harpacticoïdes (Crustacés Copépodes) de l’archipel de Kerguelen. 1. Quelques formes mésopsammiques. Bulletin du Muséum national d’Histoire naturelle, Paris, Series 3, 244 (= Zoologie, 168), 1169–1223.
Vasconcelos, D.M., Veit-Koehler, G., Drewes, J. & Santos, P.J.P. (2009) First record of the genus Kliopsyllus Kunz, 1962 (Copepoda Harpacticoida, Paramesochridae) from Northeastern Brazil with description of the deep-sea species Kliopsyllus minor sp. nov. Zootaxa, 2096 (1), 327–337. https://doi.org/10.11646/zootaxa.2096.1.19
Veit-Köhler, G. (2004) Kliopsyllus andeep sp. n. (Copepoda: Harpacticoida) from the Antarctic deep sea—a copepod closely related to certain shallow-water species. Deep-Sea Research II, 51, 1629–1641. https://doi.org/10.1016/j.dsr2.2004.06.027
Veit-Köhler, G. (2005) First deep-sea record of the genus Kliopsyllus Kunz, 1962 (Copepoda: Harpacticoida) with the description of Kliopsyllus diva sp. n.—the most abundant member of Paramesochridae at two different sites of the Angola Basin. Organisms, Diversity and Evolution, 5, 29–41. https://doi.org/10.1016/j.ode.2004.10.003
Walter, T.C. & Boxshall, G. (2019) World of Copepods database. Paramesochridae Lang, 1944. World Register of Marine Species. Availagble from: http://www.marinespecies.org (accessed 6 May 2019)
Wells, J.B.J. (1967) The littoral Copepoda (Crustacea) of Inhaca Island, Mozambique. Transactions of the Royal Society of Edinburgh, 67 (7), 189–358. https://doi.org/10.1017/S0080456800024017
Wells, J.B.J. (2007) An annotated checklist and keys to the species of Copepoda Harpacticoida (Crustacea). Zootaxa, 1568 (1), 1–872. https://doi.org/10.11646/zootaxa.1568.1.1
Werner, A.R. (2006) Vergleich von Abundanzen und Tiefenverteilung der Meiofauna, im Speziellen der Harpacticoida (Copepoda, Crustacea), in sublitoralen Kalk- und Quarzsedimenten (Mittelmeer). Diploma thesis, Carl von Ossietzky Universität Oldenburg, Oldenburg, Lower Saxony, 69 pp.
Wilson, C.B. (1932) The copepods of the Woods Hole region, Massachusetts. Bulletin of the United States National Museum, 158, 1–635. https://doi.org/10.5479/si.03629236.158.i