The Coccidian Genus Pseudoklossia

Compiled by
Donald W. Duszynski1, Steve J. Upton2, and Lee Couch1

1Department of Biology, University of New Mexico
2Division of Biology, Kansas State University

Supported by NSF-PEET DEB 9521687

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Updated: 2 May 1999
Comments: (Duszynski)
or (Upton)

The genus Pseduoklossia Leger & Duboscq, 1915 has oocysts with many sporocysts, each sporocyst generally with 2 sporozoites. Most species occur in marine molluscs, although one species (formerly Grasseella microcosmi Tuzet & Ormieres, 1960) occurs in an ascidian. The genus has traditionally been placed in the heteroxenous family Aggregatidae Labbe, 1899 because merogonous stages were never reported for the type species. However, enough other members of the genus have been examined to suggest that all members of this taxon may have direct life-cycles. Desser & Bower (1997) created the genus Margolisiella for those species with known direct life-cycles, and left the remaining, possibly heteroxenous species within the genus Pseudoklossia, family Aggregatidae. However, we believe it likely that all members of the genus will be found to be homoxenous and believe that Margolisiella should be considered a synonym of Pseudoklossia.

Pseudoklossia chitonis Debaisieux, 1919

Synonym: Margolisiella chitonis (Debaisieux, 1919) Desser & Bower, 1997
Host: Acanthochites fascicularis (Mollusca)
References: Debaisieux 1919, 1922

Pseudoklossia glomerata Leger & Duboscq, 1915

Host: Tapes floridus, T. virgineus (Mollusca)
References: Leger & Duboscq 1915

Pseudoklossia haliotis Friedman, Gardner, Hedrick, Stephenson, Cawthorn, & Upton, 1995

Synonym: Margolisiella haliotis (Friedman, Gardner, Hedrick, Stephenson, Cawthorn, & Upton, 1995) Desser & Bower, 1997
Hosts: Haliotis corrugata, H. cracherodii, H. fulgens, H. kamschatkana, H. rufescens, H. walallensis
References: Culver & Richards 1992; Friedman 1991; Friedman et al. 1993, 1995; Haaker et al. 1992;
Sommerville 1988; Steinbeck et al. 1992; VanBlaricom et al. 1993, 1994

Pseudoklossia kabatai (Desser & Bower, 1997)

Synonym: Margolisiella kabatai Desser & Bower, 1997
Synonym: Pseudoklossia sp. of Morado, Sparks, & Reed, 1984
Host: Protothaca staminea (Mollusca)
References: Desser & Bower 1997; Morado et al. 1984

Pseudoklossia microcosmi (Tuzet & Ormieres, 1960)

Synonym: Grasseella microcosmi Tuzet & Ornieres, 1960
Host: Microcosmus sulcatus (Ascidia)
References: Ormieres & Porchet-Hennere 1974; Tuzet & Ormieres 1960

Pseudoklossia patellae Debaisieux, 1919

Synonym: Margolisiella patellae (Debaisieux, 1919) Desser & Bower, 1997
Host: Patella vulgaris (Mollusca)
References: Debaisieux 1919, 1922

Pseudoklossia pectinis Leger & Dubosqc, 1917

Host: Pecten maximus (Mollusca)
References: Leger & Dubosqc 1917
This coccidian has syzygy and, thus, does not belong to the genus Pseudoklossia or the family Eimeriidae.

Pseudoklossia pelseneeri (Leger, 1897) Leger & Duboscq, 1915, species inquirendae

Synonym: Hyaloklossia pelseneeri Leger, 1897
Host: Donax sp., Tellina sp. (Mollusca)
References: Debaisieux 1919, 1922; Leger 1897; Leger & Duboscq 1915
This species has 4-6 sporozoites per sporocyst and probably belongs in the genus Ovivora.

Pseudoklossia semiluna (Desser, Bower, & Hong, 1998)

Host: Mytilus edulis, M. galloprovincialis, M. trossulus (Mollusca)
References: Bower 1992; Bower & Figeras 1989; Bower et al. 1994; Desser et al. 1998; Farley 1988; Robledo et al. 1994

Pseudoklossia tellinovum Buchanan, 1979

Synonym: Margolisiella tellinovum (Buchanan, 1979) Desser & Bower, 1997
Synonym: Merocystis tellinovum Buchanan, 1979
Host: Tellina tenuis (Mollusca)
Reference: Buchanan 1979

"Unidentified coccidian" of Leibovitz, Schot, & Karney, 1984

Host: Argopecten irradians (Mollusca)
Reference: Karlsson 1991; Leibovitz et al. 1984; Whyte et al. 1994


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