Inverse diameter vs. proper semi-major axis for the populations of inner main-belt asteroids (gray circles) with p_V ≤ 0.12 (right panel) and with p_V > 0.12 (left panel). The black solid squares represent objects that are outside the V-shapes of known families and are therefore included in our list of planetesimals. The solid red circles are the parent bodies (or largest members) of known families, which we also include in the list of planetesimals. Asteroids that are clearly compositionally distinct from the V-shape family in which they reside are marked with filled symbols, namely a red pentagon for (732) Tjilaki, a red left-pointing triangle for (172) Baucis, a green cross for (186) Celuta, a magenta upside-down triangle for (230) Athamantis, an olive triangle for (234) Barbara, and a blue right-pointing triangle for (337) Devosa. See text for the method used for the selection. The primordial family of low-albedo asteroids is represented inside the V-shape delimited by the two dashed lines, as described by Delbo et al. (2017).