However, other discoveries and analyses soon followed, revealing similar-looking animals such as Anomalocaris from the Burgess Shale and Kerygmachela from Sirius Passet.[1][2] Another Burgess Shale animal, Aysheaia, was considered very similar to modern Onychophora,[48] which are regarded as close relatives of arthropods.[49] Paleontologists defined a group called lobopodians to include fossil panarthropods that are thought to be close relatives of onychophorans, tardigrades and arthropods but lack jointed limbs.