Competing populations of species in this phylum are used to measure climate change in Antarctica's dry valleys. The fungus Arthrobotrys [ar-throw-BAH-tris] grows nets to catch soildwelling members of 
Competing populations of species in this phylum are used to measure climate change in Antarctica's dry valleys. The fungus Arthrobotrys [ar-throw-BAH-tris] grows nets to catch soildwelling members of this phylum, which also includes the model organism C. elegans and the parasite that causes (*) heartworm infection in pets. For 10 points, name this phylum, whose members have external cuticles and cylindrical bodies and which is commonly known as roundworms.
Competing populations of species in this phylum are used to measure climate change in Antarctica's dry valleys.
Nematoda (accept nematodes, accept roundworms before mentioned)