FIGURE 49 in Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus

FIGURE 49. Jassa herdmani (Walker, 1893). Variation in thumb length relative to body length in males from Plymouth Sound, England, 14 April 1937, D. M. Reid, coll., from a buoy (SNM). Arrows refer to the associated gnathopod illustrations. The subadult male had a thumb visible inside the cuticle, indicating that it would molt next into a thumbed adult. Setae omitted except for those around the thumb and spines in order to landmark position changes with growth. All views lateral. Scale 0.1 mm. Linear regression assumptions failed for all plots. Illustration after Conlan (1990).