Animals 1 Arthropoda 1 Arthropods 1 Biomechanics 1 Ecology 1 Ecosystem 1 Fossils 1 Functional diversity 1 Hydrodynamics Ordovician 1 Placoparia 1 Swimming 1 Trilobitomorpha 1 animal 1 arthropod 1 article 1 biomechanics 1 computational fluid dynamics 1 computer simulation 1 ecology 1 ecosystem 1 fluid dynamics 1 food 1 fossil 1 fossil record 1 functional diversity 1 functional response 1 habitat 1 hydrodynamics 1 locomotion 1