FIGURE 16 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini

FIGURE 16. Ventojassa frequens (Chilton, 1883). Comparison of thumb length relative to body length for the conical and cubic thumbed males from Chilton's collection at Lyttelton, N.Z. and two collections at Tapeka and Kaikoura, N.Z. about 100 years later. Linear regression assumptions passed for the conical thumbed males at Tapeka. Linear regression statistics: male, thumb length = -0.094 + 0.068 x body length, r2 = 0.754, n = 31.