Edoardo Perroncito has written:

'Rhabdonema strongyloides Leuckart-Anguillula intestinalis e Pseudorhabditis stercoralis' -- subject(s): Human beings, Strongyloidiasis, Rhabditida, Intestines, Parasites

'La Tubercolosi dei bovini in rapporto alla tubercolosi umana' -- subject(s): Tuberculosis

It seems like you are referring to the taxonomic classification of an organism. A rounded worm can belong to the Kingdom Animalia, Phylum Nematoda, Class Secernentea, Order Rhabditida, Family Rhabditidae, and possibly the genus Caenorhabditis if you are specifically referring to the model organism C. elegans.