Species in this phylum exhibit a pseudo·coe·lem body cavity.
These organisms' ameboid sperm is the only eukaryotic cell known to lack G-actin. They have no circular muscle layer and secrete a collagenous cuticle, which they molt during growth. Species in this phylum exhibit a pseudo·coe·lem body cavity. Parasitic ones include hookworms and the trichinella worm, and another species in this phylum has 959 somatic cells, C. elegans. Distantly related to platy·hel·minths and annelids, for 10 points, name this phylum consisting of roundworms.
These organisms' ameboid sperm is the only eukaryotic cell known to lack G-actin.
{nematoda} or {nematodes} [prompt on {roundworms}]