Projasus George and Grindley, 1964
Projasus George and Grindley, 1964, Journal Royal Society Western Australia, 47(3): 87. Gender masculine.
Isopuerulus Bahamonde, 1963, Noticiario mensual Museo Nacional Historia Natural Santiago Chile, 7(81): 4. Type species, by monotypy: Jasus parkeri Stebbing, 1902. Gender masculine. Name unavailable as it, when established, was not "accompanied by a description or definition that states in words characters that are purported to differentiate the taxon", and neither is there "a bibliographic reference to such a published statement" (Art. 13 of the International Code of Zoological Nomenclature).
Isopuerulus Bahamonde, 1965, Noticiario mensual Museo National Historia natural Santiago Chile, 10(112): 5. Type species by monotypy: Jasus parkeri Stebbing, 1902. Gender masculine. This time the name is availably established, even though barely so, as the author states that the genus is smaller than the genus Jasus ("de menor talla que la anterior"). However, now it is a junior objective synonym of Projasus George and Grindley, 1964.