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The evolutionary and biogeographic history of the armoured harvestmen – Laniatores phylogeny based on ten molecular markers, with the description of two new families of Opiliones (Arachnida)
TLDR
Ancestral range reconstruction of the clade suggests that the ancestral range of Samooidea comprises West Tropical Gondwana (West Africa + Neotropics), whereas that of Zalmoxoidea is exclusively Neotropical.
A multilocus approach to harvestman (Arachnida: Opiliones) phylogeny with emphasis on biogeography and the systematics of Laniatores
TLDR
Age estimates for the main Opiliones lineages suggest a Carboniferous diversification of Cyphophthalmi, while its sister group, Phalangida, diversified in the Early Devonian, and most major lineages predate the Cretaceous.
Comparative description of ten transcriptomes of newly sequenced invertebrates and efficiency estimation of genomic sampling in non-model taxa
TLDR
This work generated the first study of comparative transcriptomics across multiple animal phyla, established the first Illumina-based transcriptomic datasets for sponge, nemertean, and sipunculan species, and generated a tractable catalogue of annotated genes (or gene fragments) and protein families for ten newly sequenced non-model organisms.
Phylogenomic interrogation of arachnida reveals systemic conflicts in phylogenetic signal.
TLDR
It is shown that phylogenetic signal for the monophyly of Arachnida is restricted to the 500 slowest-evolving genes in the data set, and that outgroup selection without regard for branch length distribution exacerbates long-branch attraction artifacts and does not mitigate gene-tree discordance, regardless of high gene representation for outgroups that are model organisms.
Investigating the Bivalve Tree of Life – an exemplar-based approach combining molecular and novel morphological characters
TLDR
An analysis of the informativeness of morphological characters showed that sperm ultrastructure characters are among the best morphological features to diagnose bivalve clades, followed by characters of the shell, including its microstructure.
Phylogenomic resolution of scorpions reveals multilevel discordance with morphological phylogenetic signal
TLDR
A phylogenomic assessment to resolve scorpion phylogeny, for the first time, is applied, sampling extensive molecular sequence data from all superfamilies and examining basal relationships with up to 5025 genes, finding a robust basal topology of scorpions that is entirely at odds with traditional systematics and controverts previous understanding of scorpion evolutionary history.
Into the deep: a phylogenetic approach to the bivalve subclass Protobranchia.
TLDR
Estimation of divergence times in concert with analyses of diversification rates demonstrate the signature of the end-Permian mass extinction in the phylogeny of extant protobranchs.
The house spider genome reveals an ancient whole-genome duplication during arachnid evolution
TLDR
The results reveal that spiders and scorpions are likely the descendants of a polyploid ancestor that lived more than 450 MYA, and this study of the ancient WGD event in Arachnopulmonata provides a new comparative platform to explore common and divergent evolutionary outcomes ofpolyploidization events across eukaryotes.
Pan-arthropod analysis reveals somatic piRNAs as an ancestral defence against transposable elements
TLDR
It is reported that somatic piRNAs were probably present in the ancestral arthropod more than 500 million years ago, calling into question the view that the ancestral role of the piRNA pathway was to protect the germline and demonstrating that small RNA silencing pathways have been repurposed for both somatic and germline functions throughout arthropods evolution.
Sipunculan phylogeny based on six genes, with a new classification and the descriptions of two new families
TLDR
Sipunculan phylogeny based on six genes, with a new classification and the descriptions of two new families, is presented.
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