INTRODUCTION The basic human body plan, the arrangement of organs in the body, is laid
down during embryonic development. Insight into the formation of this plan informs …

Patterns of segmentation and tagmosis are reviewed for Chelicerata. Depending on the
outgroup, chelicerate origins are either among taxa with an anterior tagma of six somites, or …

The Early Devonian Rhynie and Windyfield cherts remain a key locality for understanding
early life and ecology on land. They host the oldest unequivocal nematode worm …

The evolutionary events during the Ediacaran–Cambrian transition (~ 541 Myr ago) are
unparalleled in Earth history. The fossil record suggests that most extant animal phyla …

Roots are one of the three fundamental organ systems of vascular plants, and have roles in
anchorage, symbiosis, and nutrient and water uptake,–. However, the fragmentary nature of …

The decreasing cost of acquiring computed tomographic (CT) data has fueled a global effort
to digitize the anatomy of museum specimens. This effort has produced a wealth of open …

The majority of extant arachnids are terrestrial, but other chelicerates are generally aquatic,
including horseshoe crabs, sea spiders, and the extinct eurypterids. It is necessary to …

Arachnids are an important group of arthropods. They are: diverse and abundant; a major
constituent of many terrestrial ecosystems; and possess a deep and extensive fossil record …

Arthropleura is a genus of giant myriapods that ranged from the early Carboniferous to Early
Permian, with some individuals attaining lengths> 2 m. Although most of the known fossils of …

Computed tomography (CT) has become very widely used in scientific and medical research
and industry for its non-destructive and high-resolution means of detecting internal structure …