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

  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},
  • 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

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

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.

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

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

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)

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

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

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).

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.



Almost a spider: a 305-million-year-old fossil arachnid and spider origins

The recovered phylogeny suggests the earliest character to evolve on the spider stem-group is the secretion of silk, which would have been followed by the loss of a flagelliform telson, and then the ability to spin silk using spinnerets, which may be a key to the group's success.

The phylogeny of fossil whip spiders

The data suggest that Graeophonus is a crown group amblypygid, and falls within a monophyletic Paleoamblypgi clade, but outside the family Paracharontidae, and a new placement for the Burmese amber genus Kronocharon is suggested.

Fossil evidence for the origin of spider spinnerets, and a proposed arachnid order

Enigmatic flagellar structures originally described as Arachnida incertae sedis, are shown to be Attercopus anal flagella, and an arachnid order, Uraraneida, is erected for a plesion, including these two genera.

The spider tree of life: phylogeny of Araneae based on target‐gene analyses from an extensive taxon sampling

We present a phylogenetic analysis of spiders using a dataset of 932 spider species, representing 115 families (only the family Synaphridae is unrepresented), 700 known genera, and additional

Morphological phylogenetics of the sea spiders (Arthropoda: Pycnogonida)

The reduction of the chelifores, palps and ovigers — shown independently within each of the clades as parallel evolution events — challenges the assumption of a gradual mode of reduction within the Pycnogonida, according to analysis of unordered vs ordered characters.

Anatomically modern Carboniferous harvestmen demonstrate early cladogenesis and stasis in Opiliones.

High-resolution X-ray micro-tomography is used to describe two new harvestmen from the Carboniferous of France, allowing the first phylogenetic analysis of any Palaeozoic Opiliones, explicitly resolving both specimens as members of different extant lineages, and providing corroboration for molecular estimates of an early PalAEozoic radiation within the order.

Chelicerates and the Conquest of Land: A View of Arachnid Origins Through an Evo-Devo Spyglass.

  • P. Sharma
  • Biology
    Integrative and comparative biology
  • 2017
It is demonstrated that candidate genes critical to tracheal fate specification in Drosophila melanogaster are expressed very differently in arachnid exemplars, and that different terrestrial arthropod lineages have solved the challenge of aerial respiration using different developmental mechanisms.

Morphology of locomotor appendages in Arachnida: evolutionary trends and phylogenetic implications

Cladistic analysis suggests that Arachnida is monophyletic and that absence of extensor muscles is a primitive condition, and phylogenetic relationships among ‘extensorless’ groups cannot be resolved solely on the basis of appendicular characters.

Three-dimensional reconstruction and the phylogeny of extinct chelicerate orders

X-ray microtomography is used to reconstruct members of two extinct arachnid orders, and a cladistic analysis of the chelicerates is presented to accompany these reconstructions, suggesting that these results are not robust to the addition of novel characters or fossil taxa.