A third-stage larva ofAnisakis sp. was found coiled and encapsulated on the mesentery of a 168 cm long coelacanth female (CCC no. 154) examined at Guelph in 1992. The larva was 8.4 mm in length and 300 μm in maximum width. The oesophagus was 820 μm and the ventriculus about 310 μm in length (Fig. 1a). The prominent excretory pore was 21 μm from the cephalic extremity (Fig. 1b). The tail was 105 μm in length and was terminated by a minute mucron (Fig. 1c). The larva is readily identified by the asymmetrical elevations on the cephalic extremity, the prominent excretory pore and duct near the cephalic extremity and the presence of a ventriculus.