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Dorataspid acantharean, the cytoplasm is attached to the radiating strontium sulphate spicules by contractile myonemes. The outer cytoplasm (ectoplasmic layer) is filled with vacuoles, and most of the cytoplasmic organelles are located within the central capsule which is orange. The acantharea are one of the four types of large amoebae which occur in the marine water column. Dark ground image by Linda Amaral Zettler.
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Centers for Disease Control/Division of Parasitic Diseases and Malaria
EOL staff
Life cycle of Bertiella tapeworms The life cycle of Bertiella species is not completely understood. Bertiella are believed to have two-host life cycles, with an arthropod intermediate host (usually a mite, likely an oribatid mite) and a vertebrate definitive host (usually non-human primates for the species implicated in human infections). Bertiella studeri (which is found in Africa and Asia) usually infects monkeys in the genera Anthropithecus, Cercopithecus, Cynomologus, and Macaca. Bertiella mucronata (which is found in South America and Cuba) usually infects monkeys in the genera Callicebus and Alouatta. Bertiella eggs and proglottids are passed in the feces of the definitive host (1). Oncospheres (which contain the tapeworm larvae) are ingested by the arthropod intermediate host (2) and within this host the oncospheres develop into cysticercoid larvae (3). The definitive hosts become infected when they ingest arthropod intermediate hosts (4) infected with cysticercoids. Adult Bertiella reside in the small intestine of the definitive host (5), where they attach to the mucosa with the aid of an unarmed scolex (6) (the anterior end of a tapeworm's head). Humans can occasionally serve as definitive hosts for both B. studeri and B. mucronata, usually after accidentally ingesting infected mites (7).From
Centers for Disease Control Parasites and Health website
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Acantharean, the cytoplasm is attached to the radiating spicules by contractile myonemes. Most of the cytoplasmic organelles are located within the central capsule. The acantharea are one of the four types of large amoebae which occur in the marine water column. Dark ground image by Linda Amaral Zettler
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Acantharean cyst, the radiating spicules have been resorbed, and the organism cannot be identified in this state. The acantharea are one of the four types of large amoebae which occur in the marine water column. Scanning electron micrograph by A. F. Michaels.
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Acantharean skeleton, the skeletal material is strontium sulphate - and there are normally 20 radiating spicules but they may give rise to side branches to form more elaborate structures. The acantharea are one of the four types of large amoebae which occur in the marine water column. Scanning electron micrograph by A. F. Michaels.
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Acantharean, the cytoplasm is attached to the radiating spicules by contractile myonemes. The outer cytoplasm is filled with vacuoles, and most of the cytoplasmic organelles are located within the central capsule. The acantharea are one of the four types of large amoebae which occur in the marine water column. Dark ground image by Dave Caron
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Acantharean, the cytoplasm is attached to the radiating spicules by contractile myonemes. The outer cytoplasm is filled with vacuoles, and most of the cytoplasmic organelles are located within the central capsule. The acantharea are one of the four types of large amoebae which occur in the marine water column. Dark ground image by Dave Caron
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Acantharean, the cytoplasm is attached to the radiating spicules of strontium sulphate by contractile myonemes. The acantharea are one of the four types of large amoebae which occur in the marine water column. Dark ground image by Dave Caron
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Conidia (spores) of the deuteromycotan fungus, Alternaria alternata (FRIES,1832) KEISSLER,1912. The conidia are obclavate (shaped like a bowling pin) and form single file chains as seen here. The spores have both longitudinal and horizontal septae. Each conidium tapers into a narrow rounded protuberance. Alternaria digests cellulose and is commonly found on dead grasses. Some species are plant pathogens causing "early" potato and tomato blight and leaf rot. The Irish potato famine of 1845-1849 was due to inection by a different fungus, Phytophthora infestans which causes "late" blight.These specimens of A. alternata were found at the margins of a slow-moving freshwater stream in Boise, Idaho.Since A. alternata is terrestrial and not aquatic, the water was probably contaminated by airborne conidia.Phase contrast.
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Conidia (spores) of the deuteromycotan fungus, Alternaria alternata (FRIES,1832) KEISSLER,1912. The conidia are obclavate (shaped like a bowling pin) and form single file chains as seen here. The spores have both longitudinal and horizontal septae. Each conidium tapers into a narrow rounded protuberance. Alternaria digests cellulose and is commonly found on dead grasses. Some species are plant pathogens causing "early" potato and tomato blight and leaf rot. The Irish potato famine of 1845-1849 was due to inection by a different fungus, Phytophthora infestans which causes "late" blight.These specimens of A. alternata were found at the margins of a slow-moving freshwater stream in Boise, Idaho.Since A. alternata is terrestrial and not aquatic, the water was probably contaminated by airborne conidia.DIC
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Jacques Fournier, Huzefa A. Raja, Carol A. Shearer
Mycokeys
Figure 1.AâF Jahnula purpurea (from the HOLOTYPE; MJF 14016, ILLS 72402). AâC Ascomata on submerged wood. Note the purple stain. Arrowheads indicate the subtending superficial hyphae on wood, which connect multiple ascomata on wood D Ascoma in water showing broad hyphae emerging from the base of the fruiting body E, F Longitudinal section through ascoma. Note broad pseudoparenchymatic cells comprising the peridial wall. Scale bars: A, C = 500 µm; B = 1 mm; D = 100 µm; EâF = 20 µm;
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Jacques Fournier, Huzefa A. Raja, Carol A. Shearer
Mycokeys
Figure 2.GâI Clavate to obclavate asci. J, K Ascus apex showing faint truncate ocular chamber L Pseudoparaphyses MâN Multiguttulate brown ascospores. Note ascospores showing minutely verrucose warts forming a loose reticulate pattern O Immature ascospore in India ink. Scale bars: GâI, M = 20 µm; JâL = 5 µm; N, O = 10 µm.
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This photomicrograph shows a chain of conidia of a Alternaria sp. fungus, which can be a cause of phaeohyphomycosis.Created: 1955
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This photomicrograph shows a chain of conidia of a Alternaria sp. fungus, which can be a cause of phaeohyphomycosis.Created: 1955
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This photomicrograph shows a chain of conidia of a Alternaria sp. fungus, which can be a cause of phaeohyphomycosis.Created: 1955
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This photomicrograph shows a chain of conidia of a Alternaria sp. fungus, which can be a cause of phaeohyphomycosis.Created: 1955
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From a frontal view, this photograph depicts a single colony of Ochroconis humicola, fungi, formerly known as Scolecobasidium humicola, which had been isolated from a specimen of infected fish.Created: 1974
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This was a case of phaeohyphomycosis of subcutaneous tissue due to the fungus Curvularia harveyi.Created: 1973
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This was a case of phaeohyphomycosis of subcutaneous tissue due to the fungus Curvularia harveyi.Created: 1973
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This photomicrograph shows conidiophores and conidia of the fungus Curvularia harveyi.Created: 1973
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This photomicrograph shows conidiophores and conidia of the fungus Curvularia harveyi.Created: 1973