pseudoscorpion
noun
pseu·do·scor·pi·on ˌsü-dō-ˈskȯr-pē-ən 
: any of a widely distributed order (Pseudoscorpionida synonym Pseudoscorpiones) of tiny arachnids that have no caudal stinger and feed on tiny invertebrates (such as insects and mites)
Example Sentences
Recent Examples on the Web Paula Cushing, an evolutionary biologist who studies solifugids at the Denver Museum of Nature and Science, says some research suggests the animals are most closely related to pseudoscorpions, while other work links solifugids to a group of mites. 
Jason Bittel, Smithsonian, 9 Aug. 2017 The ancient invertebrate retains segments along its abdomen, more like archaic forms of arachnids such as the pseudoscorpions. National Geographic, 30 Mar. 2016
Jason Bittel, Smithsonian, 9 Aug. 2017 The ancient invertebrate retains segments along its abdomen, more like archaic forms of arachnids such as the pseudoscorpions. National Geographic, 30 Mar. 2016 Word History
Etymology
New Latin Pseudoscorpiones, from pseud- + Latin scorpion-, scorpio scorpion
First Known Use
1835, in the meaning defined above