摘要:

SYNOPSISOocysts ofEimeria dericksoniRoudabush,Eimeria mascoutiniWacha&Christiansen, andEimeria vesicostiedasp. n. were isolated from the Spiny Soft‐shell Turtle,Trionyx spiniferusLeSueur, in Iowa. The sporulated oocysts ofE. dericksoniare redescribed to include, for the first time, the dimensions of the sporocysts (6.0–8.5 × 3.0–5.0 μm) and the structural appearance of the Stieda body (thinly convex); the oocysts ofE. vesicostiedaare newly described as being thickwalled, narrowly ovoid to narrowly ellipsoid, measuring 22.0–25.5 × 16.5–20.5 μm. and having a polar granule, a sporocyst residuum, and a vesicle‐like Stieda body; the oocysts ofE. mascoutiniare documented p

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04748.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

SYNOPSISOocysts ofEimeria crotalviridissp. n. are described from prairie rattlesnakes,Crotalus viridis viridisin New Mexico on the basis of light and electron microscopy andin vitroexcystation of sporozoites. Sporulated oocysts ofE. crotalviridisare elliptical, 26.4 × 22.3 (23–29 × 20–24) μm with ovoid sporocysts 11.7 × 8.1 (11–13 × 7–9) μm. A micropyle, micropyle cap and polar bodies are absent, but oocyst and sporocyst residua and Stieda and substieda bodies are present. Excysted sporozoites are 12.4 × 2.8 (11–13 × 2–3) μm and have 1 large posterior refractile body and a nucleus with a prominent nucleolus. Ultrastructurally, the oocyst wall has 2 layers, a thick, electron‐dense, highly sculptured outer layer composed of a fine granular matrix and a thin, granular, osmiophilic inner layer, separated from the outer layer by at least one unit membrane. These layers are 441 (353–510) and 21.6 (19–29) nm thick, respectively. Within 15 min after exposure to a trypsin‐sodium taurocholate fluid, sporozoites ofE. crotalviridisexcysted

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04749.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

SYNOPSISFour of 5 meadow jumping mice (Zapus hudsonius) captured had in their feces a previously undescribed species ofEimeriawhich is namedEimeria zapisp. n. The sporulated oocysts measured 21.7 (19.5–24.0) × 20.3 (17.5–23.0) μm. The single‐layered oocyst wall was 1.5 μm thick, rough, pitted and appeared clear‐to‐amber. Usually 2 polar granules could be seen. An oocyst residuum was not observed. Each sporocyst averaged 16.0 (12.5–18.0) × 9.7 (7.5–11.5) μm. A substiedal body was present. The sporocyst residuum consisted of a membrane‐enclosed packet of 15 to 20 granules. This is the first species ofEimeriato be described

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04750.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

SYNOPSISA new species of the family Colpodidae, genusColpodaO. F. Müller,Colpoda spiralissp. n. is described. This organism has been found only in treehole fluid. Its species status is based on the possession of a unique and prominent preoral protuberance, multimicronuclearity, and the preference for a treehole habitat. Its range is known to include the tri‐state area of Arizona, New Mexico and Utah, and the mixed‐deciduous forests of Maryland. This species prefers treehole fluids with a pH>7 and is naturally limited to tree species which possess these alkaline treeholes. It encysts as a treehole dries and excysts when the treehole is again filled by fluids from the tree, or rainw

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04751.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04752.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

SYNOPSISAn ameba, bearing a fringe of scales on the plasmalemma surface, dwells among the filaments of the colonial, blue‐green algaTrichodesmium thiebautii(Sournia), and preys upon bacteria growing within the colony. The cytoplasm is clearly differentiated into a fine fibrillar ectoplasm at the periphery of the cell and a central endoplasm containing most of the membranous organelles. The nucleus contains a spheroidal nucleolus which is centrally located, and a double membrane containing pores. The tubular mitochondria, microbodies, lysosomes, and endoplasmic reticulum are typical for protozoa. The Golgi apparatus consists of an array of elongate flattened cisternae. One surface is associated with a fine fibrillar layer and the opposite surface contains electron‐dense vesicles (perhaps primary lysosomes) and scale‐containing vesicles that appear to be the origin of the scales deposited on the plasma membrane. Three kinds of bacteria‐containing vacuoles are presnt: (a) vacuoles surrounded by 3 membranes and containing bacteria that are either healthy or in an early stage of digestion, (b) singlemembrane vacuoles which are food vacuoles that become converted to digestive vacuoles, and (c) larger vacuoles resembling those in (b) which contain prey in an advanced stage of digestion. The presence of amebae within pelagic algal communities provides further evidence for the diversity of their habitats in th

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04753.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

SYNOPSISThe fine structure of the 3 generations of meronts, merogony, and merozoites ofEimeria labbeanaPinto from the ileal mucosa of experimentally infected pigeons,Columba liviaLinnaeus, was described and compared to that of similar stages in other species ofEimeria.Sporozoite‐trophozoite transition stages, trophozoites (5.8 × 4.2 μm), young meronts (10.1 × 8.4 μm), and mature meronts with free merozoites of the first generation, were observed at 20, 28, 36, and 48 hr post‐infection, respectively. The 2nd and 3rd generation merogony were completed at 96 and 144 hr. Merogony was essentially of the ectomerogonous type without cytomere formation, as in most species. The average number of merozoites per meront in the 3 generations was 10 (5–15), 14 (8–19), and 7.5 (6–16); and the average size was 4.4 × 2.1 (4.1–5.9 × 1.8–2.2) μm, 4.2 × 1.8 (4.0–4.8 × 1.5–2.0) μm, and 5.4 × 1.8 (5.2–7.8 × 1.6–2.0) μm, respectively. Aggregation and subsequent degeneration of micronemes within membrane‐bounded vesicles in the sporozoite‐trophozoite stage, was observed as a possible mode of eliminating certain organelles present in the motile stages. Centrioles with (9 + 1) microtubular composition, and centrocones, were frequently seen in early meronts. Anlagen of micronemes, without any apparent association with the Golgi complex and the merozoite bud, were seen to develop in the cytoplasm of the meront. A single, median structure, probably representing the anlage of the rhoptry‐microneme system was observed within the conoid of an early merozoite bud. Connections between the micronemes and the bulbous portion of the rhoptries, and a branched (interconnected ?) structure of the rhoptries observed in the present study, substantiate the present contention that the micronemes and rhoptries are functional forms of the same complex of

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04754.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

SYNOPSISSchizogony ofSarcocystis cruziHasselmann (syn.S. fusiformisRailliet) takes place in vascular endothelial cells 26 to 33 days after cattle ingest sporocysts from dogs. Kidney cortex from a heavily infected, dexamethasone‐treated bovine was fixed for electron microscopy to determine the method of schizogonie development. Schizogony takes place by endopolygeny characterized by marked enlargement of the parasite nucleus, formation of nuclear lobes, presence of numerous spindles with adjacent pairs of centrioles along the nucleus, and simultaneous formation of daughter merozoites in the cytoplasm adjacent to the spindle poles. Endopolygeny inS. cruzidiffers from that in other Sporozoa in that merozoite anlagen are seen in the cytoplasm before any nuclei divide. The resultant merozoites continue development and, when mature, resemble other sporozoan zoites. Upon release from the host cell into capillaries, they travel to muscle tissue to continue the life cycle by forming sarcocyst

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04755.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04756.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

SYNOPSISTo fill in some of the gaps in our knowledge of Schizogony ofHaemoproteus columbaeKruse, transmission experiments involving inoculation into pigeons (Columba liviaGmelin) of sporozoites from salivary glands of the hippoboscid flyPseudolynchia canariensis(Macquart) were carried out. We were unable to detect prepatent schizonts or to observe schizogonic development when infection became chronic. Schizonts were mainly confined to lung tissue. Observations of parapatent schizonts were made in smears and tissue sections. A variety of forms was found. Cytomeres were rarely encountered. Two types of morphologically distinct merozoites were seen. One type was twice as large as the other and was thought to repeat the process of schizogony several times before invading erythrocytes. Schizonts with cytoplasmic clefts were not common in our material due to the fixatives used (Bouin's and Carnoy's). Merozoites were occasionally observed inside monocytes, probably being phagocytosed.

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1977.tb04757.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY