Caron Jean-Bernard

The differentiation of different batches of body segments—tagmosis—is perhaps the most ubiquitous characteristic of arthropods. Specific patterns of tagmosis frequently characterize major arthropod clades. For example, various malacostracan crustacean groups like crabs, isopods and amphipods exhibit particular patterns of tagmosis, with different appendages adapted for sensation, feeding, respiration, walking, swimming, brooding eggs, grooming and more [1].

1. Introduction Recent years have witnessed a steady thinning in the ranks of ‘weird wonders’, that is taxa with unfamiliar, if not bizarre, body forms that seemingly preclude confident assignment to known groups. Albeit with varying degrees of confidence, many such taxa have now been shunted to reasonably secure phylogenetic destinations (e.g. [1,2]).

Restricted accessResearch articles Abstract The in situ preservation of animal behaviour in the fossil record is exceedingly rare, but can lead to unique macroecological and macroevolutionary insights, especially regarding early representatives of major animal clades. We describe a new complex ecological relationship from the middle Cambrian Burgess Shale (Raymond Quarry, Canada). More than 30 organic tubes were recorded with multiple enteropneust and polychaete worms preserved within them.