Cyclodontina again
14-12-2009 07:35
In reaction to
this
post,
Gabriela Cuezzo sent me another picture of
a Cyclodontina
that she recently
took in Argentina, Missiones, just across the
border of Brazil.
According to her this is C. guarani (d’Orbigny, 1835), described from Prov. Corrientes. This species strongly resembles C. fusiformis (Menke, 1828), which is only known from Brazil and was recognized by Ignacio Agudo on the photograph (re-figured below).
Although the pictures are made at a different angle, the similarities are striking (e.g., the darker blotches on the upper whorls). Gabriela’s picture clearly shows the sculpture of strong axial striae; the lower-hand figure is too unclear to be decisive about this feature.
Of course, it could be a striking case of vicariance that one species (fusiformis) lives only on one side of the river and another (guarani) on the other side. At the same time, the possibility that this is a case of ‘administrative classification’ cannot be excluded, nor even a possibility synonymy.
Perhaps a good occasion for a joint excursion of some Argentinian-Brazilian malacologists to find out the true status?
According to her this is C. guarani (d’Orbigny, 1835), described from Prov. Corrientes. This species strongly resembles C. fusiformis (Menke, 1828), which is only known from Brazil and was recognized by Ignacio Agudo on the photograph (re-figured below).
Although the pictures are made at a different angle, the similarities are striking (e.g., the darker blotches on the upper whorls). Gabriela’s picture clearly shows the sculpture of strong axial striae; the lower-hand figure is too unclear to be decisive about this feature.
Of course, it could be a striking case of vicariance that one species (fusiformis) lives only on one side of the river and another (guarani) on the other side. At the same time, the possibility that this is a case of ‘administrative classification’ cannot be excluded, nor even a possibility synonymy.
Perhaps a good occasion for a joint excursion of some Argentinian-Brazilian malacologists to find out the true status?