Latreilliidae de Haan, 1840

The foreguts of Latreillia valida und Latreillia metanesa share two remarkable autapomorphic characters that distinguish them from all other brachyuran species examined here. First, the foreguts are laterally flattened and secondly, the oesophagus is anteriorally-directed.

Latreillia valida de Haan, 1839 (Fig. 5) and Latreillia metanesa Williams, 1982

The paired oval prepterocardiac ossicles (IIa) are joined at the midline. The unpaired propyloric ossicle (VI) is inclined some 10–20° in the posterior direction. The pectinal ossicle (VIII) is horseshoe-shaped with 11 accessory teeth. Ossicle (XXIa) is not recognisable.