Morphological differences between five very similar gregarines of acridians reported in the literature. This table is based on individual descriptions provided by the authors of [7, 21, 22, 24, 30]; see also . D, diameter; L, length; W, width; TL, total length.
|Gregarine||Gregarina acridiorum (Léger, 1893) Labbé, 1899  ||Gregarina garnhami Canning, 1956 ||Gregarina rigida (Hall, 1907) Ellis, 1913 ||Gregarina ronderosi, Lange & Wittenstein, 2002 ||Gregarina caledia, Ninham, 1995 |
|Hosts||Caelifera: Acrididae, Tetrigidae; Ensifera: Tettigoniidae||Caelifera: Acrididae||Caelifera: Acrididae; Ensifera: Tettigoniidae||Caelifera: Acrididae||Caelifera: Acrididae|
|Infected sites in hosts||Midgut||Early stages in gastric ceca and occasionally in the midgut; gamonts in the midgut||Early stages in gastric ceca, near the anterior end of the midgut||Trophozoites, solitary or associated gamonts in gastric ceca and gut; gametocysts in the hindgut||Trophozoites, solitary or associated gamonts in gastric ceca and midgut; gametocysts in the hindgut|
|Trophozoites – gamonts|
|Gamonts||Gamonts: cylindrical, ovoid in older forms, endocyte yellow orange.
||Gamonts: rather stout bodied in older forms, endocytes are pale yellow.
||Gamonts: rather stout bodied, endocytes are brownish orange.
||Trophozoite (epimerite): L: 10.4–275 μm, more slender than gamonts; Gamonts: rather stout bodied, endocytes are pale yellow.
||Gamonts: pale-yellow, ovoid then cylindrical
|Association Length||TL: up to 1000 μm||TL: 500–1110 μm||TL: up to 1425 μm (average: 550 μm). Protomerite smaller in the satellite than in the primite||TL: 160–700 μm (average: 425 μm). Primites and satellites are similar in size and shape||TL: 515 μm. Primites and satellites are similar in size. Also seen: primite with 2 small satellites|
|Epimerite||Small, spherical with a short stalk.||Small, globular with a short stalk.||Small spherical hyaline knob.||Conical when attached, globular and smaller in free trophozoites||Globular|
|Protomerite||Sub-globular in primites, depressed at the anterior end in satellites.||Conical in young stages, subspherical in older stages, widest at the septum, tapering towards the anterior end, flattened in satellite.||Somewhat flattened, 3 times wider than long, generally less constriction at septum more or less indistinct.||Sub-globular in primites, depressed at anterior end in satellites, less flattened than in G. garnhami||Rounded anterior end|
|Deutomerite||Cylindrical, rounded posterior end||Cylindrical or rounded, with sharply pointed posterior end||Cylindrical or barrel-shaped, little wider than protomerite, broadly rounded end or flattened “cornered” extremity||Cylindrical, rounded posterior end, wider than protomerite, barrel-shaped in older forms||Cylindrical, in small gamonts, wider than in protomorites and rounded in older forms|
|Gametocysts – oocysts|
|Gametocysts||D: 500 μm, thick ectocyst||D: 114–470 μm (exclusive of the ectocyst)||D: 300 μm in average. Yellow orange color. Thick ectocyst||D: 96–376 μm. Thick ectocyst||D: 228–312 μm (mean 270 μm). Yellow orange color. Ectocyst (24–100 μm thick)|
|Basal discs||Yellow orange||Yellow orange||Not mentioned||Orange||Orange|
|Sporoducts||12–15, with a swollen basal part, L > 1/2 cyst diameter||8, L: 1/3 cyst diameter (without ectocyst)||10 or more, short||12–15, L: up to 60 μm||5 to more than 10|
|Oocysts (sporocysts)||Dolioform*, double wall||Dolioform*, thick wall||Barrel-shaped*||Dolioform* or Barrel-shaped*||Barrel-shaped*|
|7.6 μm × 3.3 μm||6.5–7 μm × 4 μm||8 μm × 5 μm||5 μm × 3.2 μm||12 μm × 6 μm|
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