It was the first multicellular organism to have its genome completely sequenced.
This organism's movement is described by the pirouette model. The myosin protein NMY-2 helps establish developmental asymmetry in this organism. Tra-1 is a key controller of its sex determination. Flattened branched cilia enclosed by an amphid shealth cell are characteristic of its AWA, AWB, and AWC neurons. Its traditional "wild type" strain is N2. Their lifecycle sometimes includes a (*) dauer stage. RNA interference was discovered in them and these invertebrates have a body cavity that is only partially formed by mesoderm tissue. These pseudocoelomates have 131 cells die to apoptosis and the fates of its original 959 cells are mapped out. It was the first multicellular organism to have its genome completely sequenced. For 10 points, name this common model organism, a small nematode worm.
This organism's movement is described by the pirouette model.
Caenorhabditis Elegans [accept nematodes; prompt on roundworms before mention]