Fieber (1851) described S. homalonotus from three localities (Croatia, Italy and Hungary). Wagner (1953o) was unable to find any type specimens from these localities, but he did find two specimens from the Noualhier (MNHN) collection that conformed to this species. They were from Reinosa, Spain; he selected one of them as the lectotype, but since it did not come from the type series, it cannot be a lectotype. It could possibly be considered a neotype, but Péricart (2002) declared the type designation invalid; he also felt that this species was distinct enough that neotype designations were not needed.
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