Solar-powered sea slugs. Mollusc/algal chloroplast symbiosis

Program in Molecular and Environmental Plant Sciences, Texas A&M University, College Station, Texas 77843-2133, USA.
Plant physiology (Impact Factor: 7.39). 06/2000; 123(1):29-38. DOI: 10.1104/pp.123.1.29
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    ABSTRACT: The Cylindrobulla / Ascobulla complex—unraveling problems in identification and adding to Cylindrobulla diversity (Gastropoda, Heterobranchia, Sacoglossa) by describing a new species Abstract Sacoglossa (Gastropoda: Heterobranchia) are generally considered a monophyletic group, previously associated within the now defunct "Opisthobranchia", but now basally located within Panpulmonata. In the light of this new phylogenetic hypothesis, detailed knowledge of the most basal groups within Sacoglossa is of paramount importance. This study focus-es on the genus Cylindrobulla, which is usually considered the most basal group within the Sacoglossa from a morpho-logical point of view, because it does not share the typical elongate radula teeth of all other Sacoglossa. We describe a new species, Cylindrobulla schuppi sp. nov., and provide data on its food. We reexamined and clarify the radula of the type species C. beauii, review the genus with all other valid species, provide new characters to aid in the proper identification of species within this genus, compare it to the very similar genus Ascobulla, present a determination key using external characters to ensure proper identification of the two similar genera, and discuss phylogenetic relationships within the shelled sacoglossan, the Oxynoacea.
    Zootaxa 12/2014; 3893(3):339-362. DOI:10.11646/zootaxa.3893.3.2 · 1.06 Impact Factor
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    ABSTRACT: Opisthobranch molluscs exhibit fascinating body plans associated with the evolution of shell loss in multiple lineages. Sea hares in particular are interesting because Aplysia californica is a well-studied model organism that offers a large suite of genetic tools. Bursatella leachii is a related tropical sea hare that lacks a shell as an adult and therefore lends itself to comparative analysis with A. californica. We have established an enhanced culturing procedure for B. leachii in husbandry that enabled the study of shell formation and loss in this lineage with respect to A. californica life staging.
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    ABSTRACT: Horizontal gene transfer (HGT) may not only create genome mosaicism, but also introduce evolutionary novelties to recipient organisms. HGT in plastid genomes, though relatively rare, still exists. HGT‐derived genes are particularly common in unicellular photosynthetic eukaryotes and they also occur in multicellular plants. In particular, ancient HGT events occurring during the early evolution of primary photosynthetic eukaryotes were probably frequent. There is clear evidence that anciently acquired genes played an important role in the establishment of primary plastids and in the transition of plants from aquatic to terrestrial environments. Although algal genes have often been used to infer historical plastids in plastid‐lacking eukaryotes, reliable approaches are needed to distinguish endosymbionts‐derived genes from those independently acquired from preferential feeding or other activities.
    Journal of Systematics and Evolution 01/2013; 51(1). DOI:10.1111/j.1759-6831.2012.00237.x · 1.65 Impact Factor

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