sentences:  They can be distinguished from other long-jawed Dyspnoi, like "Ischyropsalis", "Taracus", and "Oskoron", by the complete absence of any spines on the second thoracic segment, though they are not known to be sympatric with any of those genera.This family is very geographically conserved, and is known only from East Asia, primarily the four main Japanese islands.They are also known from South Korea, the more southern Japanese islands of Yakushima and Amami Ōshima, and most of the Kuril Islands, except for Urup.