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The Ctenophore Genome and the Evolutionary Origins of Neural Systems
The draft genome of Pleurobrachia bachei, Pacific sea gooseberry, together with ten other ctenophore transcriptomes, are presented, and show that they are remarkably distinct from other animal genomes in their content of neurogenic, immune and developmental genes.
Evidence from 18S ribosomal DNA that the lophophorates are protostome animals
Sequence analyses show that lophophorates are protostomes closely related to mollusks and annelids, which deviates from the commonly held view of deuterostome affinity.
Phylogenomics reveals deep molluscan relationships
This work uses transcriptome and genome data from all major lineages (except Monoplacophora) and recovers a well-supported topology for Mollusca to propose the node-based name Pleistomolluscan, which strongly support the Aculifera hypothesis and finds support for advanced cephalization and shells as possibly having multiple origins within Mollsusca.
Annelid phylogeny and the status of Sipuncula and Echiura
Using multiple genes and explicit hypothesis testing, it is shown that Echiura, Siboglinidae, and Clitellata are derived annelid with polychaete sister taxa, and that Sipuncula should be included within annelids.
Species boundaries and global biogeography of the Alexandrium tamarense complex (Dinophyceae) 1
This study combines existing data with new ribosomal DNA sequences from strains originating from the six temperate continents to reconstruct the biogeography of the A. tamarense complex and explore the origins of new populations.
Phylogeography of the ocean quahog (Arctica islandica): influences of paleoclimate on genetic diversity and species range
Genetic subdivision in the ocean quahog is consistent with the hypothesis that a warm Holocene climatic optimum, and not glacial refugia, shaped the present-day genetic structure in A. islandica.
Open‐ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus (Nemertea: Lineidae)
Open‐ocean environments provide few obvious barriers to the dispersal of marine organisms. Major currents and/or environmental gradients potentially impede gene flow. One system hypothesized to form
Illuminating the base of the annelid tree using transcriptomics.
This study based on transcriptomic data comprising 68,750-170,497 amino acid sites from 305 to 622 proteins resolves annelid relationships, including Chaetopteridae, Amphinomidae, Sipuncula, Oweniidae, and Magelonidae in the basal part of the tree.
Error, signal, and the placement of Ctenophora sister to all other animals
Investigating possible causes of systematic error by expanding taxon sampling with eight novel transcriptomes, strictly enforcing orthology inference criteria, and progressively examining potential causes of systemic error while using both maximum-likelihood with robust data partitioning and Bayesian inference with a site-heterogeneous model finds a single, statistically robust placement of ctenophores as the authors' most distant animal relatives.
The New View of Animal Phylogeny
The evidence supporting the current understanding of metazoan phylogeny is discussed on a clade by clade basis, supported by molecular and morphological data.