“…The nature of substrates would therefore be one of the primary factors, as found by Foster (1989). It is also important to note that brachiopods in general show great morphological variability or phenotypic plasticity (Alexander, 1977;Topper et al, 2017;Williams et al, 2006) which allows them to adapt to a wide range of habitats (Williams et al, 2006), where substrate type influences by inhibiting or promoting shell growth in a particular direction (Topper et al, 2017). In the case of M. venosa, which was registered along the whole latitudinal gradient, the highest values for mean body size were found at two stations (43 and 35), corresponding to 46°S and 51°S latitudes, respectively (Fig.…”