Fig. 2
SEM images of the L. fortunei gills. a Dorsal view of the gill showing the lamellae, the inner- and outer- demibranch [id and od] joined by the gill axis [ga]. The od is behind and folded under the id. Its ventral margin appears at the lower left of the image. b Frontal view of one lamella [lm] showing its ventral aspect. c Longitudinal view of one filament demibranch [f] showing its lateral aspect. The marginal food groove [mfg] at the lamella’s edge is pointed out by the arrowheads in images (b,c)