Cretaceous arachnid Chimerarachne yingi gen. et sp. nov. illuminates spider origins

@article{Wang2017CretaceousAC,
  title={Cretaceous arachnid Chimerarachne yingi gen. et sp. nov. illuminates spider origins},
  author={Bo Wang and Jason A. Dunlop and Paul A. Selden and Russell J. Garwood and William A. Shear and Patrick M{\"u}ller and Xiaojie Lei},
  journal={Nature Ecology \& Evolution},
  year={2017},
  volume={2},
  pages={614-622}
}
  • Bo Wang, J. Dunlop, Xiaojie Lei
  • Published 5 February 2018
  • Biology
  • Nature Ecology & Evolution
Spiders (Araneae) are a hugely successful lineage with a long history. [] Key Result Here, we describe Chimerarachne yingi gen. et sp. nov., a remarkable arachnid from the mid-Cretaceous (approximately 100 million years ago) Burmese amber of Myanmar, which documents a key transition stage in spider evolution.

Origin of spiders and their spinning organs illuminated by mid-Cretaceous amber fossils

TLDR
Two extraordinarily well-preserved Mesozoic members of Uraraneida with a segmented abdomen, multi-articulate spinnerets with well-defined spigots, modified male palps, spider-like chelicerae and a uropygid-like telson are reported.

Phylogenetic systematics and evolution of the spider infraorder Mygalomorphae using genomic scale data

TLDR
The first such analysis for the group within a strict phylogenetic framework shows that a sheet web is likely the plesiomorphic condition for mygalomorphs, as well as providing hints to the ancestral foraging behavior for all spiders.

Phylogenetic Systematics and Evolution of the Spider Infraorder Mygalomorphae Using Genomic Scale Data.

TLDR
The first such analysis for the spider infraorder Mygalomorphae within a strict phylogenetic framework shows that a sheet web is likely the plesiomorphic condition for mygalomorphs, as well as providing insights to the ancestral foraging behavior for all spiders.

Spider Origins: a Palaeontological Perspective

TLDR
Spiders (Araneae) can be defined as spiders which have lost the telson, something which appears to have occurred multiple times among arachnids.

Developmental gene expression as a phylogenetic data class: support for the monophyly of Arachnopulmonata

TLDR
It is shown that scorpions, like spiders, retain two copies of all four transcription factors required for appendage patterning, whereas arachnid orders like mites and harvestmen bear a single copy.

Mitochondrial phylogenomics provides insights into the phylogeny and evolution of spiders (Arthropoda: Araneae)

TLDR
This study, the largest mitochondrial phylogenomics analysis of spiders to date, highlights the usefulness of mitogenomic data not only for providing efficient phylogenetic signals for spider phylogeny, but also for characterizing trait diversification in spider evolution.

Integrating phylogeny, ontogeny and systematics of the mite family Smarididae (Prostigmata, Parasitengona): Classification, identification key, and description of new taxa

TLDR
A key to larval genera of Smarididae and a key to species of Trichosmaris are given, previously known only from post larval instars.

Converging on the orb: denser taxon sampling elucidates spider phylogeny and new analytical methods support repeated evolution of the orb web

TLDR
Overall, this work provides the most comprehensive spider tree‐of‐life to date using transcriptomic data and uses new methods to explore controversial issues of web evolution, including the origins and multiple losses of the orb web.

On the problematic placement of the fossil arthropod Devonopilio hutchinsoni in Opiliones (Arachnida).

TLDR
The description of Devonopilio hutchinsoni Tihelka as a new fossil harvestman from the well-known Rhynie chert deposits of Scotland is described, but there is no compelling evidence supporting the proposal that the specimen is a harvestman.

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