01840nas a2200193   4500008004100000020001400041245014300055210006900198260000800267300001200275490000700287520122900294100001701523700001401540700001301554700001701567700001401584856004801598       2010                        eng d  a1055-790300aIncongruence between molecular phylogeny and morphological classification in amphipod crustaceans: A case study of Antarctic lysianassoids0 aIncongruence between molecular phylogeny and morphological class  cApr  a202-2090 v553 a<p>In Antarctic waters, the superfamily Lysianassoidea is one of the most important amphipod groups both in terms of species number and abundance. Dominant members of this superfamily are species of the orchomenid complex, found throughout the Southern Ocean. This study presents the first molecular phylogenetic analysis based on a representative subset of the Antarctic species belonging to different orchomenid genera and hence provides a framework for a systematic revision of these taxa. The current classification of the orchomenid genera is mainly based on mouthpart morphology. The validity of these morphological characters was assessed by resolving phylogenetic relationships using nuclear 28S rRNA and mitochondrial cytochrome oxidase subunit I sequences. The molecular data rejected most of the previously proposed taxonomic subdivisions within this complex. The genera Abyssorchomene and Orchomenella as well as the subgenus Orchomenopsis appeared to be non-monophyletic. This implies that the supposed diagnostic characters are likely a result of convergent evolution. Further, our results indicated the necessity of a revision of the family-level systematics. (C) 2009 Elsevier Inc. All rights reserved.</p>
1 aHavermans, C1 aNagy, Z T1 aSonet, G1 aDe Broyer, C1 aMartin, P  uhttps://lysianassidae.myspecies.info/node/401985nas a2200145   4500008004100000020001400041245009200055210006900147260000800216300001000224520152400234100001501758700001701773856004901790       2008                        eng d  a1175-532600aAlicellidae and Valettiopsidae, two new callynophorate families (Crustacea : Amphipoda)0 aAlicellidae and Valettiopsidae two new callynophorate families C  cAug  a57-663 a<p>Two new families, the Alicellidae fam. nov. and the Valettiopsidae fam. nov., are described based on genera traditionally considered as lysianassoid amphipods. The Alicellidae fam. nov. are deep-sea scavengers often associated with thermal vents. They are distinguished from all other amphipods by a combination of characters which includes a callynophore on antenna 1; a broad, serrate left lacinia mobilis ( occasionally narrow or vestigial) and a reduced or vestigial right lacinia mobilis ( occasionally broad and serrate); simple or subchelate gnathopod 1; an elongate ischium, rectolinear carpus and propodus and a small dactylus on gnathopod 2 ( not mitten-shaped); absence of apical robust setae on uropods 1 and 2 and a deeply cleft telson. The family contains 6 genera: Alicella Chevreux, 1899; Apotectonia Barnard &amp; Ingram, 1990; Diatectonia Barnard &amp; Ingram, 1990; Paralicella Chevreux, 1908; Tectovalopsis Barnard &amp; Ingram, 1990; Transtectonia Barnard &amp; Ingram, 1990. The Valettiopsidae fam. nov. are deep-sea scavenging amphipods defined by a combination of characters which includes a callynophore on antenna 1; serrate, curved incisors; a well developed, serrate lacinia mobilis on each mandible, an oblique setal row on the inner plate of maxilla 2, an elongate ischium on gnathopod 2; the absence of robust setae on the apices of uropods 1 and 2 and a deeply cleft telson. The family contains two genera, Valettiopsis Holmes, 1908 and Valettietta Lincoln &amp; Thurston, 1983.</p>
1 aLowry, J K1 aDe Broyer, C  uhttps://lysianassidae.myspecies.info/node/10