The similarity of the new species described below to
the type species of Margarya, M. melanioides is striking
(Fig. 3F, G). Although numerous cases of astonishingly detailed
convergence are known from freshwater gastropods,
including viviparids (e.g., Annandale 1919, 1924), a close
relationship of the fossil and Recent species seems likely
in this case. Up to the Miocene, both the Yunnan lakes and
Nanning Basin presumably belonged to the expansive Palaeo-Red
River catchment area (Clift et al. 2008; Hoang et
al. 2009; Schneider et al., in press), and migration along the
respective fluvial connections may have promoted the fossil
and Recent distribution of Margarya.