ABSTRACT A comprehensive review of a full developmental sequence of eodiscinid
trilobites reported in recent decades from Cambrian Series 2 and 3 strata is presented …

Abstract The Ordovician Radiation shaped Paleozoic marine ecosystems and led to an
increase in the biodiversity of marine organisms. The onset of the Plankton Revolution in the …

Well-preserved, distinctive columnar microbialites were discovered in the Wirrealpa
Limestone (Stage 4, Series 2 of Cambrian) of South Australia. However, further studies are …

Documentation of malformed trilobites has presented invaluable insight into the
palaeobiology of a wholly extinct euarthropod group. Although the northern hemisphere …

The trilobite hypostome is a biomineralized ventral plate that covers the mouth, but its
evolutionary origin remains controversial. The labrum is a lobe-like structure that can take on …

Trilobites are an abundant group of Palaeozoic marine euarthropods that appear abruptly in
the fossil record c. 521 million years ago. Quantifying the development of morphological …

The chronostratigraphical scale is a hierarchical scheme that is subdivided into increasingly
smaller units, from eonothem down to the level of the substage and beyond. Boundaries of …

The ontogeny of two species of corynexochid trilobites from the middle Cambrian Mount Cap
Formation of the eastern Mackenzie Mountains, northern Canada, is documented. Sahtuia …

The developmental mode of four redlichiid trilobites is summarized, based upon
exceptionally well‐preserved, articulated specimens from Cambrian Series 2 (stages 3 and …