Location: Naso-pharynx. 

 Localities: British Columbia; California. 

 Recorded by: Ferris (1942); Fisher (1952); 

 Margolis (1956). 



Halarachne halichoeri Allman, 1847 



Syn.: Halarachne otariae of Ferris, 1925, 

 in part. 



Host: Phoca vitulina richardi - harbour seal. 



Location: Naso-pharynx. 



Localities: Washington; California. 



Recorded by: Ferris (1925, 1942); Scheffer 

 and Slipp (1944). 



Remarks: Ferris (1925) identified specimens 

 from Pacific Grove, Calif., as Halarachne 

 otariae Steding, 1923. In 1942 he redeter- 

 mined these specimens as H. halichoeri. 

 Newell (1947) doubted the existence of this 

 species on the Pacific coast of North Amer- 

 ica and referred the above records of it to 

 H. miroungae. 



Halarachne miroungae Ferris, 1925 



Hosts: Enhydra lutris - sea otter; Mirounga 



angustirostris - northern elephant seal; 



Phoca vitulina richardi - harbour seal. 

 Location: Naso-pharynx. 

 Localities: Alaska; California (San Diego 



Zoo) ; Baja California. 

 Recorded by: Ferris (1925, 1942); Doetsch- 



man (1941); Newell (1947); Kenyon et al. 



(1965); Kenyon (1969). 



Orthohalarachne attenuata (Banks, 1910) 

 Newell, 1947 



Syn.: Halarachne attenuata Banks, 1910. 

 Hosts: Callorhinus ursinus - northern fur 



seal; Eumetopias jubatus - Steller sea lion; 



Zalophus calif ornianus - California sea lion. 

 Location: Naso-pharynx. 

 Localities: Alaska; Oregon; California. 

 Recorded by: Banks (1910); Oudemans 



(1926); Newell (1947); Keyes (1965); 



Dailey and Hill (1970). 



Orthohalarachne diminuata (Doetschman, 

 1944) Newell, 1947 

 Syn.: Halarachne diminuata Doetschman, 

 1944. 

 Hosts: Callorhinus ursinus - northern fur 

 seal; Eumetopias jubatus - Steller sea lion; 

 Zalophus californianus - California sea lion. 



Location: Bronchioles and trachea. 



Localities: Alaska; British Columbia; Cali- 

 fornia. 



Recorded by: Doetschman (1944a); Newell 

 (1947) ; Margolis (1956); Thorsteinson and 

 Lensink (1962); Keyes (1965); Dailey 

 (1970); Dailey and Hill (1970). 



Remarks: Thorsteinson and Lensink (1962) 

 referred to their specimens from Eumetopias 

 jubatus as "nose mites." It seems likely, 

 therefore, that they had either Orthohalar- 

 achne attenuata or O. zalophi, which occur in 

 the nasal passages, rather than O. diminuata, 

 which occurs deeper in the respiratory sys- 

 tem. 



Orthohalarachne zalophi (Oudemans, 1916) 

 Newell, 1947 

 Syns.: Halarachne zalophi Oudemans, 

 1916. 

 Halarachne otariae Steding, 1923. 



Hosts: Eumetopias jubatus - Steller sea lion; 

 Zalophus calif oi-nianus - California sea lion. 



Location: Naso-pharynx. 



Localities: California (wild and captive ani- 

 mals); Germany (Gottingen Zoo). 



Recorded by: Oudemans (1916, 1926); Ste- 

 ding (1923); Doetschman (1941); Ferris 

 (1942); Newell (1947). 



Remarks: Oudemans (1916) and Steding 

 (1923) described Halarachne zalophi and H. 

 otariae, respectively, from the same Cali- 

 fornia sea lion in Gottingen. Ferris (1942) 

 and Newell (1947) considered H. otariae 

 identical with H. zalophi, the latter author 

 transferring the species to Orthohalarachne. 



HOST-PARASITE LIST 



Cetacea 



Balaena glacialis - black right whale. 

 Amphipoda: Cyamus erraticus, C. gracilis, C. 

 ovalis. 



Balaena mysticetus - northern bowhead whale. 

 Amphipoda: Cyamus ceti. 



Balaenoptera acutorostrata - minke whale. 

 Amphipoda: Cyamus balaenopterae. 



15 



