Abstract
A new amphipod crustacean, Liljeborgia clytaemnestra sp. nov., is described based on specimens from Malta andthe Bay of Naples. It is quite similar to the sympatric L. dellavallei Stebbing, 1906, but it has narrower and moreregular-sized spines on the propodus of pereiopods 3–4. The longest spine on the dorsolateral border of the pedun-cle of uropod 1 is not strongly elongate in adult males, as in L. dellavallei. The apical spines on the lobes of the tel-son are much longer than in L. dellavallei. L. clytaemnestra sp. nov. is actually more similar to two northeasternAtlantic species, the British L. pallida (Spence Bate, 1857) and the Scandinavian L. brevicornis (Bruzelius, 1859)than to the Mediterranean L. dellavallei. In L. clytaemnestra sp. nov., article 2 of the mandibular palp has setae ondistal third, whilst setae are restricted to tip in the two other species. Article 3 of the mandibular palp is also longerin L. clytaemnestra sp. nov. than in the two Atlantic species. The spines of the outer plate of the maxilliped are lon-ger in L. clytaemnestra sp. nov. than in the two other species. The most distal spine of the propodus of pereiopods3–4 is reduced in L. clytaemnestra sp. nov. and L. brevicornis, but not in L. pallida. The serration of the posteriorborder of the basis of pereiopod 7 is much stronger in L. clytaemnestra sp. nov. than in the two other species.Finally, in L. clytaemnestra sp. nov., the spines of the lobes of the telson are longer than in L. pallida. A lectotypeis designated for L. dellavallei. The presence/absence of a posterodorsal tooth on pleonite 3 in L. dellavallei is dis-cussed. The validity of L. kinahani (Spence Bate, 1862) is questioned. An identification key is proposed for Mediterranean Liljeborgia species.References
Bellan-Santini, D., Ledoyer, M. (1973) Inventaire des amphipodes gammariens récoltés dans la région de Marseille. Téthys, 4(4), 899–934.
Bruzelius, R.M. (1859) Bidrag till kännedomen om Skandinaviens Amphipoda Gammaridea. Konglinga Svenska Vetenskaps-Academiens Handlingar, Ny Fjold [new series], 3(1), 1–104, pls. 1–4.
Cecchini, C., Parenzan, P. (1935) Anfipodi del Golfo di Napoli. Pubblicazioni della Stazione zoologica di Napoli, 14(2), 153–251.
Chevreux, E. (1911) Campagnes de la Melita. Les amphipodes d'Algérie et de Tunisie. Première partie. Mémoires de la Société Zoologique de France, 23 [for 1910], 145–285, pls. 1–20.
Chevreux, E. & Fage, L. (1925) Amphipodes. Faune de France, 9, 1–488.
Coleman, C.O. (2003) “Digital inking”: How to make perfect line drawings on computers. Organisms, Diversity and Evolution, Electronic Supplement, 14, 1–14.
Coleman, C.O. (2009) Drawing setae the digital way. Zoosystematics and Evolution, 85(2), 305–310.
Geldiay, R., Kocataş, A. & Krapp-Schickel, G. (1971) Some littoral amphipods from the Gulf of Izmir (Egean Sea, Turkey, Mediterranean). Memorie del Museo civico di storia naturale di Verona, 18, 369–387.
Harmelin, J.G. (1964) Etude de l’endofaune des mattes d’herbiers de Posidonia oceanica Delile. Recueil des Travaux de la station Marine d’Endoume, Fascicule 55, Bulletin 35, 43–106.
ICZN [International Commission on Zoological Nomenclature] (1999) International code of Zoological Nomenclature, Fourth Edition adopted by the International Union of Biological Sciences. The International Trust for Zoological Nomenclature, the Natural History Museum, London. xxix pp, 306 pp.
Krapp-Schickel, G. (1975) Neues über die Liljeborgiiden des Mittelmeeres (Crustacea, Amphipoda). Bolletino del Museo civico di storia naturale di Verona, 1, 455–472.
Krapp-Schickel, G. (1989) Family Liljeborgiidae, pp. 459–468. In: Ruffo, S. (ed.), The Amphipoda of the Mediterranean, part 2 Gammaridea (Haustoriidae to Lysianassidae). Mémoires de l'Institut Océanographique, 13, xv–xx, 365–576.
Ledoyer, M. (1968) Ecologie de la faune vagile des biotopes méditerranéens accessibles en scaphandre autonome (région de Marseille principalement). IV. — Synthèse de l'étude écologique. Recueil des Travaux de la station Marine d'Endoume, Fascicule 60, Bulletin 44, 125–355.
Ledoyer, M. (1977) Contribution à l'étude de l'écologie de la faune vagile profonde de la Méditerranée nord occidentale. I. Les gammariens (Crustacea, Amphipoda). Bolletino del Museo civico di storia naturale di Verona, 4, 321–421.
Lowry, J.K. & Stoddart, H.E. (1993) Crustacea Amphipoda: Lysianassoids from Philippine and Indonesian waters. In: Crosnier, A. (ed.). Résultats des Campagnes MUSORSTOM, volume 10. Mémoires du Muséum national d'Histoire naturelle, Paris, 156, 55–109.
Munilla, T. & San Vincente, C. (2005) Suprabenthic biodiversity of Catalan beaches (NW Mediterranean). Acta oecologica, 27(2), 81–91.
Spence Bate, C. (1857) A synopsis of the British Edriophthalmous Crustacea. — Part I. Amphipoda. Annals and Magazine of Natural History, series 2, 19, 135–152.
Spence Bate, C. (1862) Catalogue of the specimens of amphipodous Crustacea in the collection of the British Museum. British Museum (Natural History), London, iv pp, 399 pp, 58 pls.
Stebbing, T.R.R. (1899) Revision of Amphipoda (continued). Annals and Magazine of Natural History, series 7, 4(21), 205–211.
Stebbing, T.R.R. (1906) Amphipoda. I. Gammaridea. Das Tierreich, 21, Verlag von R. Friedländer und Sohn, Berlin, xxxix pp, 806 pp.
Udekem d'Acoz, C. d' (2010) Contribution to the knowledge of European Liljeborgiidae (Crustacea, Amphipoda), with considerations on the family and its affinities. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique / Bulletin van het Koninklijk Instituut voor Natuurwetenschappen, Biologie, 80, 127–259.