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Abstract
The type of central raphe fissure deflection distinguishes two major sections of the genus Gyrosigma: one containing dimorphic, the other isomorphic species. Both dimorphism and isomorphism are governed by strict rules. Isomorphic species exclusively show deflection to the convexity of the raphe sternum, dimorphic Gyrosigmas exhibit a “handedness”, i.e. the central raphe fissures exclusively deflect to the left in all species examined.