Fossil age data and molecular sequences are increasingly combined to establish a
timescale for the Tree of Life. Arthropods, as the most species-rich and morphologically …

Arthropods are the most diverse group of animals and have been so since the Cambrian
radiation. They belong to the protostome clade Ecdysozoa, with Onychophora (velvet …

Horseshoe crabs (Xiphosura) are traditionally regarded as sister group to the clade of
terrestrial chelicerates (Arachnida). This hypothesis has been challenged by recent …

Ecdysozoans have been key components of ecosystems since the early Cambrian, when
trilobites and soft-bodied Burgess Shale-type ecdysozoans dominated marine animal …

Deciphering the evolutionary relationships of Chelicerata (arachnids, horseshoe crabs, and
allied taxa) has proven notoriously difficult, due to their ancient rapid radiation and the …

Chelicerata represents one of the oldest groups of arthropods, with a fossil record extending
to the Cambrian, and is sister group to the remaining extant arthropods, the mandibulates …

Spiders are ecologically important predators with complex venom and extraordinarily tough
silk that enables capture of large prey. Here we present the assembled genome of the social …

Long-branch attraction is a systematic artifact that results in erroneous groupings of fast-
evolving taxa. The combination of short, deep internodes in tandem with long-branch …

Chelicerates are a diverse group of arthropods, represented by such forms as predatory
spiders and scorpions, parasitic ticks, humic detritivores, and marine sea spiders …

Metaseiulus occidentalis is an eyeless phytoseiid predatory mite employed for the biological
control of agricultural pests including spider mites. Despite appearances, these predator and …