Studies on Host-Parasite Reactions to Larval Parasites. IV. The Cyst of Uvulifer ambloplitis (Hughes)

1941 ◽  
Vol 60 (4) ◽  
pp. 498 ◽  
Author(s):  
George W. Hunter ◽  
John Meacham Hamilton
Keyword(s):  
Host Parasite ◽  
Larval Parasites

Umingmakstrongylus pallikuukensis gen.nov. et sp.nov. (Nematoda: Protostrongylidae) from muskoxen, Ovibos moschatus, in the central Canadian Arctic, with comments on biology and biogeography

1995 ◽  
Vol 73 (12) ◽  
pp. 2266-2282 ◽  
Author(s):  
E. P. Hoberg ◽  
L. Polley ◽  
A. Gunn ◽  
J. S. Nishi
Keyword(s):  
Maximum Diameter ◽  
Great Length ◽  
Dense Matrix ◽  
Intensity Of Infection ◽  
Ovibos Moschatus ◽  
High Prevalence ◽  
Holarctic Region ◽  
Umingmakstrongylus Pallikuukensis ◽  
Host Parasite ◽  
Larval Parasites

Umingmakstrongylus pallikuukensis gen.nov. et sp.nov. is established for a protostrongylid nematode in muskoxen, Ovibos moschatus, from the Kitikmeot Region (central Arctic) of the Northwest Territories, Canada. It is distinguished from Cystocaulus and other Muelleriinae by characters that include the following: males: deeply incised, bilobed bursa, independent externodorsal rays, telamon composed of distal transverse plate, absence of falcate crurae, and spicules not distally split; females: absence of provagina; and first-stage larvae: presence of three cuticular folds on the tail. The great length of females (468 mm) and males (171 mm) is exceptional among the Protostrongylidae. Pathognomonic lesions include well-defined cysts dispersed through the lung tissue (maximum diameter 40 mm) containing adult and larval parasites in a dense matrix. Transmission involves a molluscan intermediate host, as indicated by experimental infections in the slug Deroceras reticulatum. The parasite is apparently restricted in its geographic distribution and has been found only in a population of muskoxen northwest of Coppermine, N.W.T. This may be indicative of a relictual host–parasite assemblage that has existed since the Pleistocene. The pathogenicity, high prevalence, and intensity of infection in the Coppermine herd suggest that the occurrence of U. pallikuukensis has implications for the management of muskoxen in the Holarctic region.

RESPONSE OF THREE CHELONUS (HYMENOPTERA: BRACONIDAE) SPECIES TO KAIROMONES IN SCALES OF SIX LEPIDOPTERA

1986 ◽  
Vol 118 (4) ◽  
pp. 329-333 ◽  
Author(s):  
A.A. Chiri ◽  
E.F. Legner
Keyword(s):  
Chemical Interaction ◽  
Searching Behavior ◽  
Sensory Adaptation ◽  
Host Searching ◽  
Adaptive Value ◽  
Searching Ability ◽  
Host Parasite ◽  
Larval Parasites

AbstractThree species of egg–larval parasites in the genus Chelonus (Hymenoptera: Braconidae) exhibited host-searching behavior when exposed to body scales from 6 species of Lepidoptera representing 3 families. The nonspecific response to scales from several hosts appears to be of adaptive value to Chelonus spp., as it is consistent with the polyphagous habits reported for this genus. The searching response was more widespread and intense in an Ethiopian Chelonus sp. than in 2 other species. It is thought that the broad responsiveness to host scales may detrimentally affect parasite searching ability through excessive loss of searching time, although sensory adaptation to the kairomones might serve to attenuate such effect. Some coevolutionary aspects of this host–parasite chemical interaction are discussed.

The Pathogenesis of Experimental Mycotic Encephalitis

1969 ◽  
Vol 27 ◽  
pp. 356-357
Author(s):  
James A. Swenberg ◽  
Adalbert Koestner ◽  
R.P. Tewari
Keyword(s):  
Electron Microscopy ◽  
Pathogenetic Mechanisms ◽  
Host Parasite

Previous investigations of pathogenetic mechanisms in mycotic encephalitis have been restricted to light microscopic and mycologic approaches. In this study, electron microscopy was utilized to determine the mode of vascular penetration and the cellular and subcellular host-parasite interrelationships in brains of mice infected with Oidiodendron kalrai. This newly isolated fungus was selected because of its ability to consistently produce encephalitis with gross and microscopic lesions similar to those observed in naturally occuring mycoses.

Examination of Schistosome Cercariae and Schistosomules by Scanning Electron Microscopy

1969 ◽  
Vol 27 ◽  
pp. 50-51
Author(s):  
D. Johnson ◽  
P. Moriearty
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Light Microscopy ◽  
Surface Structure ◽  
Extensive Study ◽  
Scanning Microscopy ◽  
Host Parasite ◽  
Conventional Electron Microscopy ◽  
Scanning Electron

Since several species of Schistosoma, or blood fluke, parasitize man, these trematodes have been subjected to extensive study. Light microscopy and conventional electron microscopy have yielded much information about the morphology of the various stages; however, scanning electron microscopy has been little utilized for this purpose. As the figures demonstrate, scanning microscopy is particularly helpful in studying at high resolution characteristics of surface structure, which are important in determining host-parasite relationships.

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