The ultrastructural identity of some cells in Sphaerolaimus gracilis de Man, 1876.

The fine structure of fibroblasts, lymphocytes, neurosecretory cells, stem cells, and steroidogenic cells in the nematode Sphaerolaimus gracilis was studied by transmission electron microscopy. Fibroblasts, lymphocytes, and stem cells were found in the lateral position at the level of the renette pore (ventral pore). Fibroblasts were characterized by long cellular processes.