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According to a footnote in the novel Agatha H. and the Voice of the Castle, the scientific name for these critters is Loxosceles Blattella Stamiona Telae Heterodyne, and that they were the deliberately lethal creation of The Red Heterodyne as part of an ongoing philosophical dispute with his brother, The Black Heterodyne. They are preyed upon by Venomous Rafter Toads.