Effect of age on the structure and activity of the pharynx of the free-living nematode Metarhabditis andrassyana (Rhabditidae)

The study of the pharynx in nematode Metarhabditis andrassyana (Tahseen et al. Int J Nematol 14:163–168, 2004) revealed that activity declined with age and was also reduced absence E.coli. A comparison between presence bacteria same group a reduction pharyngeal pumping both 2-day-old individuals 8-day-old individuals. However, when nematodes were placed together groups varying numbers, pulsations as numbers specimens increased from 5 to 15 or food source age. In old worms, abnormalities observed structure pharynx. Various structural changes occurred on surface well lumen, tissues grinder. deteriorative basal bulb reveal an involvement almost all regions bulb—the outer surface, muscles