The Collaborative International Dictionary of English v.0.48:

Myxobacteriaceae \Myxobacteriaceae\ prop. n.
   A family of bacteria living mostly in soils and on dung;
   called also Polyangiaceae.

   Syn: Polyangiaceae, family Polyangiaceae, family
        Myxobacteriaceae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Myxobacteriaceae
    n 1: bacteria living mostly in soils and on dung [syn:
         Polyangiaceae, family Polyangiaceae,
         Myxobacteriaceae, family Myxobacteriaceae]