Paper 24. D. A. Griffiths. 1979. The morpho-species and its relationship to the biological species in the genus Tyrophagus (Acridae, Acarina). Pages 199-212. In: J. G. Rodriguez (editor). Recent Advances in Acarology. Volume I of 2. Proceedings of the V International Congress of Acarology, August 6-12, 1978 at Michigan State University, East Lansing, Michigan, New York: Academic Press, 631 pages.

Keywords: Tyrophagus putrescentiae, T. longior, T. cocciphilus, T. javensis, T. deliensis, T. palmarum, T. perniciousus, T. molitor, T. silvester, T. mixus, T. zachvatkini, T. formicetorum, T. similis, T. brevicrinatus, T. tropicus, T. neiswanderi, T. africanus, T. cucumeris, T. paulensis, T. litoralis

Can hybrid forms exist in natural populations? Inter-specific crosses, intra-specific crosses. Phenotypes, identification of species is caused in part by poor material and inadequate microscopes