Family: Oral nematodesmata not a ring around mouth, more prominent to side and rear of mouth; typically 3 long, large polykinetids in oral cavity; cytostome expands along postoral suture .
Genus: Postoral kineties usually to left of oral poykinetids (Illustrated Guide, 1985). Left edge is more curved than right edge; cytopharynx with numerous strong fibrils; ectoplasm with numerous fusiform trichocysts; macronucleus oval; one to several micronulei (Kudo, 1966).

Frontonia sp. 3 clips Japan, 1998	Frontonia sp. 3 clips Japan, 1998	Frontonia sp. 8 clips Japan, 1998	Frontonia sp. 9 clips Japan, 1998
Frontonia sp. 2 clips Vermont-Maine USA, 1998