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In a 3-year study in Poland, Fedorko and Stanuszek (1971), often found a gonochoristic Pristionchus species on Colorado potato beetles and cockchafers and named it Pristionchus uniformis.
Extensive research on this and other Pristionchus spp. conducted in the laboratory of Ralf Sommer, Max Planck Institute for Developmental Biology, Tubingen, Germany.
|Males: Showing testis, spicules and gubernaculum|
Older female with eggs hatching in uteri
Herrman et al. (2006) could not find evidence of a parasitic relationship between any Pristionchus species and beetles. Thus, the genus Pristionchus is not actively involved in killing the beetles. Rather, the nematodes feed on the carcass of the dead beetle, a phenomenon that has been called “necromeny” In contrast to these observations, observations, Fedorko and Stanuszek (1971) described Pristionchus uniformis as a facultative parasite of beetles because in some cases the nematodes had invaded the insects’ body cavity.
The nematose feed on bacteria but also are preedators of other nematodes
|Pristionchus spp.feed on bacteria but also are predators of other nematodes.|
|Pristionchus uniformis with the remains of a nematode carcass.|
Pristionchus uniformis is a gonochoristic nematode that has been found on the Colorado potato beetles (Leptinotarsa decemlineata) at several locations. It has also been found on cockchafers. In a 3-year study in Poland, Fedorko and Stanuszek (1971), often found a gonochoristic Pristionchus species on Colorado potato beetles and cockchafers and named it Pristionchus uniformis.
Fedorko, A. and Stanuszek, S. 1971. Pristionchus uniformis sp. n. (Nematoda, Rhabditida, Diplogasteridae) a facultative parasite of Leptinotarsa decemlineata Say and Melolontha melolontha L. in Poland. Morphology and biology, Acta Parasitol. Pol. 19:95–112.
Herrmann, M., Mayer, W.E. and Sommer, R.J. 2006. Nematodes of the genus Pristionchus are closely associated with scarab beetles and the Colorado potato beetle in Western Europe. Zoology 109:96-108