There are new developments in the knowledge of North American Cambarids. In addition to the genetic quirk of the Procambarus Fallax (marbled crayfish) which reproduces by obligate parthenogenesis (can't even cross with males of Procambarus Fallax), another species native to Atlantic drainages, the spiny-cheeked crayfish of the genera Orconectes has been observed to reproduce by parthenogenesis when females are isolated from males for a sufficient period. Also, in China, where Procambarus Clarkii (red swamp) has been invasive for many decades. Genetic testing of a sample of 175 crayfish indicated the presence of 4 clones where the odds by sexual reproduction are about 1 in 10,000 (meaning that these apparent clones were likely produced by parthenogenesis)

It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers