Perkinsus olseni

Super Group: 
Perkinsus olseni Lester & Davis 1981
Perkinsus atlanticus


Diagnosis_Species: Perkinsus olseni Lester & Davis 1981. Infected abalone had soft cream or brown necrotic foci 1 to 8 mm across on the surface or within the musculature of the foot and mantle. When near the surface, they appeared as a hemispherical cream or brown swelling. Lesions over 3 mm in diameter contained pus. Those adjacent to the shell caused the formation of a brown scar on the shell’s internal surface.  In fresh smears, spherical cells were 16.6 µm (range of 10 measurements: 14- 18 µm) in diameter with prominent walls. Live cells had a large vacuole up to 10 µm in diameter and 50 to 100 droplets 1 pm in diameter. In fixed tissues, cells 13.8 µm ( 13 - 16 µm) in diameter with peripheral nucleus and a large vacuole were found. A vacuoplast when present was weakly eosinophilic. Dividing cells (19 µm live, 15 µm fixed and stained) divide into two, four, eight or more equal or subequal units.

Body_trophozoite_diameter: 13-16 µm
Body_prezoosporangia_diameter: 56-94 µm



Named in honor of Mr. A. M. Olsen, formerly Chief Fisheries Officer, South Australia. 

Type species

This is the type species if the species

Type illustration / Type locality / Type specimen

Type locality: Near Port Lincoln, South Australia 35°56'S, 135°59'W
Type material: Histological section  USNM Catalog. No. 30478, British Museum Accession No. 1980: 11:4:1-3, South Australian Museum No. E. 1594.
Type Host:  Haliotis ruber


Salinity: marine
Salinity: brackish

Life cycle

Symbiont: horizontal_active-penetration


Mode of locomotion

Motility: motile_swimming
Flagellum: 2

Observation site(s)


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