Resurrection of Eumorphia von Meyer, 1847 and some taxonomical considerations of other mecochirid lobsters (Crustacea, Decapoda, Mecochiridae)

Mecochirid lobsters (Glypheidea, Mecochiridae) are iconic decapod crustaceans from the Jurassic and Cretaceous. The composition of the family in terms of included genera strongly fluctuated during the twentieth century because of the lack of study of the type specimens, which are herein illustrated. On the basis of the type material of different species housed in German, French, British, and Romanian museums and universities, Eumorphia von Meyer, 1847 (type species Carcinium sociale von Meyer, 1841) is re-established as a valid mecochirid genus. Six species are considered, including the new species Eumorphia fabianmuelleri (Callovian, Germany), and the synonymization of Romaniacheiros Franţescu et al., 2018 with Eumorphia is proposed. The composition of the revised family Mecochiridae is discussed. UUID: http://zoobank.org/6a518009-c139-4ff6-8669-c9994a698cc5