Sesarmidae Dana, 1851 and Varunidae H. Milne Edwards, 1853

Based on nearly identical foregut characters, species of both families are described here together. Pseudosesarma moeschi de Man, 1888 ( Sesarmidae) (Fig. 29) and Eriocheir sinensis H. Milne Edwards, 1853 (Varunidae)

Ossicles I, II and IIb are inclined about 45° in the antero ventral direction. The oval exopyloric ossicle (IV) is enlarged. The pectinal ossicle (VIII) is ring-shaped with 11 accessory teeth. The posterior area of the prepectinal ossicle (IX) is remarkably extended and has a clearly ventrally directed hook at the middle of the ossicle. The inferior lateral cardiac ossicle (XIII) has a long oval shape and two ventrally directed crossed tips; on its dorsal part it has a posterior directed connection-piece to the subdentate ossicle (XIV). The lateral ossicle of the cardio-pyloric valve (XVIII) is greatly enlarged in size and covers the lateral side of the cardiopyloric valve. Ossicle XXIa is not recognisable.