Life-Cycle of a Sporozoan Parasite of the Oyster

Prytherch, Herbert F.

doi:10.1126/science.88.2289.451

Cited by 11 publications

(5 citation statements)

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“…The parasite has also been reported in barnacles (Mavrodiali 1908) and in estuarine crabs (Prasadan & Janardanan 2001). The first detailed description of a Nematopsis species in commercial bivalves was probably that of N. ostrearum by Prytherch (1938). This author made extensive field observations, and suggested that N. ostrearum might have played an important role in oyster mass mortalities along the Atlantic Coast and in the Gulf of Mexico (Prytherch 1940).…”

Section: Discussionmentioning

confidence: 99%

Investigation of Nematopsis spp. oocysts in 7 species of bivalves from Chonburi Province, Gulf of Thailand

Tuntiwaranuruk¹,

Chalermwat²,

Upatham³

et al. 2004

Dis. Aquat. Org.

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Section: Discussionmentioning

confidence: 99%

Investigation of Nematopsis spp. oocysts in 7 species of bivalves from Chonburi Province, Gulf of Thailand

Tuntiwaranuruk¹,

Chalermwat²,

Upatham³

et al. 2004

Dis. Aquat. Org.

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“…The majority of oocysts, referred to as spores by Sprague (1970), of almost all Nematopsis sp. have been described by light microscopy (Sato et al 1996; Sprague 1949, 1970) or illustrated by schematic drawings based on light microscopy (Belofastova 1996; Hatt 1927; Prytherch 1938, 1940; Sprague 1970). Only a few have been studied by TEM (Azevedo and Cachola 1992; Azevedo and Matos 1999; Padovan et al 2003).…”

Section: Discussionmentioning

confidence: 99%

“…Nematopsis is a heteroxenous gregarine with its vegetative and reproductive phase in crabs, and sporogony in lamelli‐branch molluscs (Prytherch 1938, 1940; Sprague 1970; Théodoridès 1962). Sporogonic stages have been reported rarely in gastropods (Hatt 1927, 1931).…”

mentioning

confidence: 99%

Nematopsis gigas n. sp. (Apicomplexa), a Parasite of Nerita ascencionis (Gastropoda, Neritidae) from Brazil

Azevedo

Padovan

2004

J Eukaryotic Microbiology

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A new species of Nematopsis (Apicomplexa, Porosporidae) is described from the mantle tissues of the seawater gastropod, Nerita ascencionis (Neritidae), collected in the Atlantic North off the coast of "Fernando de Noronha" Island (3 degrees 47' 57'' S, 32 degrees 25' 12'' W) situated about 350 km from the northeast coast of Brazil. Numerous oocysts, each contained in a parasitophorous vacuole, were found in the cytoplasm of phagocytes in the mantle tissue of the host. The phagocytes were surrounded by a thin wall composed of lucent material. The phagocyte cytoplasm contained a nucleus surrounded by numerous vesicles and some dense masses. The oocysts were 21.9 +/- 0.5 microm long, and 11.5 +/- 0.6 microm wide. The oocyst wall was 0.18-0.25 microm thick, and the apical zone contained a micropyle, 1.0-1.2 microm in diameter, covered by a canopy-like operculum about 0.25 microm thick. Externally, the oocyst wall was surrounded by numerous anastomosing microfibrils attached to the wall and extending towards the periphery of the parasitophorous vacuole. Some microfibrils formed a dense complex network that surrounded the oocyst in the middle of the parasitophorous vacuole, which opened only at the apical zone near the external region of the opercular system. On the basis of the data obtained by light and transmission electron microscopy and host specificity, the gregarine Nematopsis gigas is distinguished from the nearest species as a new species. The taxonomic affinities and morphological comparisons with other similar species of the same genus are discussed.

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“…Among the parasites infecting two types of hosts (mollusks and crustaceans) (PRYTHERCH, 1938(PRYTHERCH, , 1940, we highlight the genus Nematopsis Schneider, 1892 (Apicomplexa: Porosporidae). This is a cosmopolitan parasitic genus of apicomplexans with around 40 nominal species that have been reported in different geographic areas (ABDEL-BAKI et al, 2012;AZEVEDO & MATOS, 1999;AZEVEDO & PADOVAN, 2004;BOWER et al, 1994;OZER & GUNEYDAG, 2015;SPRAGUE, 1970;THÉODORIDÈS, 1962;TUNTIWARANURUK et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…This is a cosmopolitan parasitic genus of apicomplexans with around 40 nominal species that have been reported in different geographic areas (ABDEL-BAKI et al, 2012;AZEVEDO & MATOS, 1999;AZEVEDO & PADOVAN, 2004;BOWER et al, 1994;OZER & GUNEYDAG, 2015;SPRAGUE, 1970;THÉODORIDÈS, 1962;TUNTIWARANURUK et al, 2004). Their vegetative and reproductive phase takes place in crustaceans (schizogonic phase), while the sporogonic phases take place in bivalves (PRYTHERCH, 1938(PRYTHERCH, , 1940. It has also been reported that the sporogonic phase can take place in gastropods (AZEVEDO & PADOVAN, 2004).…”

Section: Introductionmentioning

confidence: 99%

Ultrastructure of phagocytes and oocysts of Nematopsis sp. (Apicomplexa, Porosporidae) infecting Crassostrea rhizophorae in Northeastern Brazil

Silva

Soares

Casal

et al. 2019

Rev. Bras. Parasitol. Vet.

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This work describes the detailed ultrastructural morphology of the phagocyte imprisoning an oyster of Nematopsis (Apicomplexa) found in Crassostrea rhizophorae, in the city of Maceió (AL), Brazil. The highly infected hosts had half-open leaflets with weak, slow retraction of the adductor muscles. Variable number of ellipsoid oocytes, either isolated and or clustered, was found between myofibrils of the adductor muscle. Each oocyst was incarcerated in a parasitophorous vacuole of host uninucleated phagocyte. The oocysts were composed of a dense wall containing a uninucleate vermiform sporozoite. The wall of the fine oocysts was composed of homogeneous electron-lucent material formed by three layers of equal thickness, having a circular orifice-micropyle obstructed by the operculum. The oocysts presented ellipsoid morphology with their wall was surrounded by a complex network of numerous microfibrils. Important details of the taxonomic value were visualized such as the ultrastructural organization of the oocyst wall and the organization of the micropyle and operculum, beyond the microfibrils that protrude from the oocyst wall only observed by transmission electron microscopy (TEM) and that may aid in the identification of the species. However, in order to clarify the systematic position of the species reported of the genus Nematopsis, it is important to proceed with genetic analyses.

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Life-Cycle of a Sporozoan Parasite of the Oyster

Cited by 11 publications

References 0 publications

Investigation of Nematopsis spp. oocysts in 7 species of bivalves from Chonburi Province, Gulf of Thailand

Investigation of Nematopsis spp. oocysts in 7 species of bivalves from Chonburi Province, Gulf of Thailand

Nematopsis gigas n. sp. (Apicomplexa), a Parasite of Nerita ascencionis (Gastropoda, Neritidae) from Brazil

Ultrastructure of phagocytes and oocysts of Nematopsis sp. (Apicomplexa, Porosporidae) infecting Crassostrea rhizophorae in Northeastern Brazil

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