Mesostigmata 81 



b. Cos (New name for Rhinacarus Castro, 1948, Arq. Inst. S. Paulo 

 18: 257. Not Rhinacarus Nehring, 1884.) 

 Type. Rhinonyssus {Rhinacarus) angrensis Castro, 1948 



2. Larinyssus Strandtmann, 1948 



Type. Larinyssus orbicularis Strandtmann, 1948 



3. Neonyssus Hirst, 1921 (= Neonyssoides Hirst, 1924) 



a. Neonyssus s. str. 



Type. Neonyssus intermedius Hirst, 1921 



b. Paraneonyssus Castro, 1948 



Type. Neonyssus {Paraneonyssus) enriettii Castro, 1948 



c. Rochanyssus Castro, 1948 



Type. Neonyssus {Rochanyssus) werneri Castro, 1948 



d. Travanyssus Castro, 1948 



Type. Neonyssus {Travanyssus) paranensis Castro, 1948 



e. Vitznyssus Castro, 1948 



Type. Dermanyssus nitzchi Giebel, 1871 



4. Ptylonyssoides Vitzthum, 1935 



Type. Ptylonyssoides triscutatus Vitzthum, 1935 



5. Ptilonyssus Berlese and Trouessart, 1889 



a. Ptilonyssus s. str. 



Type. Ptilonyssus echinatus Berlese and Trouessart, 1889 



b. Flavionyssus Castro, 1948 



Type. Ptilonyssus {Flavionyssus) rabelloi Castro, 1948 



c. Rhinonyssoides Hirst, 1921 

 Type, Rhinonyssoides trouessarti Hirst, 1921 



6. Rallinyssus Strandtmann, 1948 

 Type. Rallinyssus caudistigmus Strandtmann, 1948 



7. Rhinoecius Cooreman, 1946 

 Type. Rhinoecius oti Cooreman, 1946 



8. Sommatricola Tragardh, 1904 

 Type. Sommatricola levinseni Tragardh, 1904 



9. Sternostoma Berlese and Trouessart, 1889 

 Type. Sternostoma cryptorhyneum Berlese and Trouessart, 1889 



10. Sternostomum Trouessart, 1895 



Type. Sternostomum rhinoletrum Trduessart, 1895 



Discussion: Rhinonyssids are viviparous and produce larvae in which 

 the nymphs are already developed. They are parasitic in the nasal 

 passages of birds all over the world, and probably only a fraction of 

 the species has been found since few birds have been examined for 

 them. Trouessart reported that they can do damage to chicks. Strandt- 

 mann 1948 suggests that it might be interesting to investigate the pos- 

 sible role that these mites may play in ornithosis. 



