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Full-Text Articles in Life Sciences
Physid Snails As Sentinels Of Freshwater Nematomorphs, Ben Hanelt, L. E. Grother, John J. Janovy Jr.
Physid Snails As Sentinels Of Freshwater Nematomorphs, Ben Hanelt, L. E. Grother, John J. Janovy Jr.
John Janovy Publications
Freshwater nematomorphs, or gordiids, are parasitic as larvae, but free-living in aquatic environments as adults. Studies based on the collection of adults have reported gordiids to be widespread, but discontinuous in distribution. However, a relatively short adult life span and unknown life history make the detection of adults difficult. An alternative approach to investigate gordiid distribution is to use cysts. Of all paratenic hosts, snails were chosen because they lacked internal defense reactions to the cysts and become easily infected. Here, it is reported that the occurrence of gordiids on the basis of the cyst stage is much more common …
Epimerite-Host Epithelium Relationships Among Eugregarines Parasitizing The Damselflies Enallagma Civile And Ischnura Verticalis, Tamara J. Percival Cook, John J. Janovy Jr., Richard E. Clopton
Epimerite-Host Epithelium Relationships Among Eugregarines Parasitizing The Damselflies Enallagma Civile And Ischnura Verticalis, Tamara J. Percival Cook, John J. Janovy Jr., Richard E. Clopton
John Janovy Publications
The host-parasite interface between two species of damselflies and four species of eugregarines was examined at the ultrastructural level. Nubenocephalus nebraskensis organisms attached to the host midgut epithelium by means of a sucker-like protomerite; the space between the epicytic folds and host epithelium was filled with electron-dense material interpreted to be adhesive in nature. Actinocephalus carrilynnae organisms attached by means of the epimerite, which had no epicytic folds, and by the fluted stalk with characteristic epicytic folds; host cell and parasite membranes appeared fused at some places on the epimerite. Hoplorhynchus acanthatholius organisms attached by means of an ovoid epimerite …
The Response Of Gregarina Niphandrodes (Apicomplexa: Eugregarinida: Septatina) To Host Starvation In Tenebrio Molitor (Coleoptera: Tenebrionidae) Adults, Jennifer E. Schawang, John J. Janovy Jr.
The Response Of Gregarina Niphandrodes (Apicomplexa: Eugregarinida: Septatina) To Host Starvation In Tenebrio Molitor (Coleoptera: Tenebrionidae) Adults, Jennifer E. Schawang, John J. Janovy Jr.
John Janovy Publications
Numerous studies of host starvation have emphasized pathological effects of parasites on their insect host, but little attention has been focused on the effects of host starvation on the parasites. This study addressed the possibility that parasite life-cycle events could be manipulated by withholding food from the host. The system used was Gregarina niphandrodes (Apicomplexa: Eugregarinida) in Tenebrio molitor (Coleoptera: Tenebrionidae) adults. Gregarine gametocyst formation and shedding ceased after one day in starved beetles but continued in fed controls. There were no statistically significant differences between total lengths of associated (3 of 5 trials) or unassociated (5 of 5 trials) …