microscopes in the field, they were unable to identify them as a new species, Ecology Species of Pectocaris are thought to have been active swimmers. P. spatiosa and P. eurypetala have been suggested to be filter feeders, using the setae on the endites of their limbs to filter out matter from the water column, while P. inopinata has been suggested to be a predator, using its spinose antennae to capture prey. Taxonomy Pectocaris has been generally recovered as closely related to other bivalved arthropods such as Odaraia and Jugatacaris, with some studies including it within the clade Hymenocarina. See also Arthropod Cambrian explosion Chengjiang biota List of Chengjiang Biota species by phylum References Cambrian arthropods Maotianshan shales fossils Hymenocarina