The Mastinocerinae are a subfamily of phengodid beetles (Phengodidae). It contains mostly Central and South American species. They are also known as "railroad worms".
Genera Source: Akamboja Roza, Quintino, Mermudes & Silveira, 2017, 5 spp. Brasilocerus Wittmer, 1963, 9 spp. Cenophengus LeConte, 1881, 23 spp. Cephalophrixothrix Wittmer, 1976, 3 spp. Decamastinocerus Wittmer, 1988, 2 spp. Distremocephalus Wittmer, 1976, 11 spp. Eurymastinocerus Wittmer, 1976, 8 spp. Euryognathus Wittmer, 1976, 2 spp. Euryopa Gorham, 1881, 8 spp. Howdenia Wittmer, 1976, 10 spp. Iviephengus Roza, 2023, 1 sp. Mastinocerus Solier, 1849 subgenus Mastinocerus Solier, 1849, 18 spp. subgenus Paramastinocerus Wittmer, 1976, 8 spp. Mastinomorphus Wittmer, 1976, 15 spp. Mastinowittmerus Zaragoza-Caballero, 1984, 2 spp. Neophengus Wittmer, 1976, 3 spp. Nephromma Wittmer, 1976, 2 spp. Oxymastinocerus Wittmer, 1963, 9 spp. Paraphrixothrix Zaragoza-Caballero, 2010, 1 sp. Paraptorthodius Schaeffer, 1904, 3 spp. Phrixothrix Olivier, 1909, 17 spp. Pseudomastinocerus Wittmer, 1963, 9 spp. Ptorthodiellus Wittmer, 1976, 2 spp. Ptorthodius Gorham, 1881, 3 spp. Spangleriella Wittmer, 1988, 1 sp. Steneuryopa Wittmer, 1986, 1 sp. Stenophrixothrix Wittmer, 1963, 19 spp. Taximastinocerus Wittmer, 1963, 18 spp.
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