Entomopathogenic nematodes and symbiotic bacteria- nematodeinformation
It has been always reported that the infective juveniles of Steinernema spp. carry their symbiotic bacteria, Xenorhabdus spp. in a special intestinal vesicle (Bird and Akhurst, 1983) whereas the infective juveniles of Heterorhabdits spp. carry their symbiotic bacteria, Photorhabdus spp. in the anterior part of the intestine (Boemare et al., 1996) and release them in the body cavity of their insect hosts. I thought Kim et al. (2012) found a new structure for the retention of cells of symbiotic bacteria Xenorhabdus spp. in the infective juveniles of Steinernema spp but it looks like they calling this structure as a bacterial receptacle instead of intestinal vesicle. However, these researchers compared the bacterial receptacles of 25 species of Steinernematid nematodes and reported that the size of these receptacles varied between the nematode species. They also claimed that these receptacles of each nematode species or of a group of nematode species contain morphologically distinctive intravesicular structures.
Literature
Bird,A.F. and Akhurst, R.J. 1983. The nature of the intestinal vesicle in nematodes of the family Steinernematidae. International Journal of Parasitology 13: 599-606.
Boemare, N. E., Laumond, C. and Mauleon, H. 1996. The entomopathogenic nematode-bacterium complex: Biology, life cycle and vertebrate safety. Biocontrol Science and Technology 6: 333-346
Kim, S.K., Flores-Lara, Y. and Stock, S.P. 2012. Morphology and ultrastructure of the bacterial receptacle in Steinernema nematodes (Nematoda: Steinernematidae). Journal of Invertebrate Pathology 110: 366-374.