Biomedical subjects

O W Olsen

Publications and source records attributed to O W Olsen.

9 recordsLinked to original sources

PubMed1980

Helminth parasites of band-tailed pigeons in Colorado.

Examination of 609 band-tailed pigeons (Columba fasciata fasciata) collected in Colorado revealed two species of cestodes and four nematodes. Two of these were new host records. Helminths found were Hymenolepsis armata, Raillietina sp., Ascaridia columbae, Splendidofilaria columbensis, S. hibleri and Chandlerella robinsoni. Of 609 pigeons examined, 76 (12.5%) harbored helminths. Helminths were not found in pigeons younger than 9 months of age.

Animals↗

PubMed1979

Two new species of coccidia, Eimeria leucuri and E. oreoecetes (Protozoa: Eimeriidae), in grouse from Colorado.

Eimeria leucuri is described from white-tailed ptarmigan (Lagopus leucurus), and E. oreoecetes from white-tailed ptarmigan and blue grouse (Dendragapus obscurus) from Colorado. Oocysts of E. leucuri are ellipsoidal, 26.6 by 17.7 micron, each bearing a micropyle, micropyle cap, up to 4 polar granules, but no oocyst residuum. The lemon-shaped sporocysts are 15.4 by 6.7 micron, and have Stieda bodies and large amounts of sporocyst residuum. The sporocyst contents are enclosed in a membrane. Oocysts of E. oreoecetes are subspherical, 26.0 by 22.6 micron, and have up to 4 polar granules. The lemon-shaped sporocysts are 14.6 by 8.8 micron, and have both Stieda bodies and substiedal bodies and a large amount of sporocyst residuum. The sporocyst contents are enclosed in a membrane. These are the first coccidia to be described from these tetraonids.

Animals↗

PubMed1978