Juan Moles, Bastian Brenzinger, Maria I Berning, Alexander Martynov, Tatiana Korshunova, Michael Schrödl
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引用次数: 0
Abstract
The systematics of side-gilled slugs face long-lasting incongruencies provided by morphological and molecular data. Parsimonious morphological assessments divided the single superfamily Pleurobranchoidea into the shell-less Pleurobranchaeidae and the internally shelled Pleurobranchidae, including the aberrant helicoid-shelled Tomthompsonia. Molecular evidence has proven untrustworthy to date, revealing contrasting hypotheses. This study’s multilocus phylogeny benefits from a dense taxon sampling of 94 pleurobranchids, with 22 newly sequenced specimens, including type species for all known genera. We further evaluate the effects of masking with several algorithms to better enhance phylogenetic resolution. Our results support that Tomthompsonioidea superfam. nov. are the sister group of all other Pleurobranchida; the absence of an acidic oral gland and a helicoid shell are the diagnostic features. We also provide the first molecular evidence that Euselenops nests within Pleurobranchaeidae, and Pleurobranchella is related to Pleurobranchaea, but remains distinct morphologically. Regarding Pleurobranchidae, the genus Berthella is paraphyletic and now embodied in the four clades: Berthella s.s., Boreoberthella, Pleurehdera, and Tomoberthella gen. nov. The fact that, whereas there is a supposed low Antarctic diversity, we find hidden speciation in several tropical species suggests that side-gilled slugs pose an Antarctic origin or a relic that radiated in shallower, warmer waters.
期刊介绍:
The Zoological Journal of the Linnean Society publishes papers on systematic and evolutionary zoology and comparative, functional and other studies where relevant to these areas. Studies of extinct as well as living animals are included. Reviews are also published; these may be invited by the Editorial Board, but uninvited reviews may also be considered. The Zoological Journal also has a wide circulation amongst zoologists and although narrowly specialized papers are not excluded, potential authors should bear that readership in mind.