Synonyms: Isospora stomaticae Chakravarty and Kar, 1944.

Type host: Bufo stomaticus Lutken, 1864, Marbled toad.

Other hosts: None reported to date.

Type locality: ASIA: India, Calcutta suburbs.

Geographic distribution: ASIA: India, Calcutta.

Description of oocyst: Oocyst shape: broadly ellipsoidal to slightly ovoidal; number of walls: 2; wall thickness: very thin; wall characteristics: none given; L x W: 25.5 x 17.5 (24-26 x 15-20); L/W ratio: 1.5; M: absent; OR: absent; PG: absent. Distinctive features of oocyst: unsporulated oocysts are initially ovoidal or spheroidal, but become broadly ellipsoidal to ovoidal after sporulation; also, the very thin and fragile, 2-layered wall.

Description of sporocysts and sporozoite: Sporocyst shape: ovoidal; L x W: 15.4-17.6 x 11.0; L/W ratio: unknown; SB: absent (Chakravarty and Kar, 1952) or present (Mandal, 1976); SSB: absent; PSB: absent; SR: present; SR characteristics: generally a conspicuous mass of large granules (line drawing), but it is eventually absorbed with development of the SZ; SZ: elongate bodies with one end slightly pointed, 13.2 x 3.3 (12.5-15 x 2.5-4.5)with L/W ratio of 1.5, and with an obvious N centrally located. Distinctive features of sporocysts: SR prominent in freshly sporulated forms, but disappears with time..

Prevalence: Unknown.

Sporulation: Exogenous. Oocysts sporulated within 48-60 h (Mandal, 1976).

Prepatent and patent periods: Unknown.

Site of infection: Unknown.

Endogenous development: Mature meronts are spheroidal and contain 8–12 merozoites, ~6.6 x 3.2, each with a central N and an obvious karyosome. Microgamonts are ovoidal, 17.1–19.3 x 8.6–12.8, with comma-shaped microgametes, ~3.2–4.3 long. Macrogomonts vary from spheroidal to ovoidal with a diameter of ~15; their cytoplasm is granular with a deeply-staining N.

Materials deposited: None.

Remarks: This species was named and briefly described in an abstract by Chakravarty and Kar (1944), but without a line drawing; thus, initially it was a species inquirenda. Later, the same authors (Chakravarty & Kar, 1952) provided a more detailed account including information on the endogenous stages and provided a line drawing to document their observations. Mandal (1976) added further descriptive information which was nearly identical to that of the original description in mensural data of the oocyst and sporocysts; the only significant difference was that in his description of the sporocysts there was a knob-like structure at the anterior end (SB). Levine (1985) emended the spelling of the specific epitaph when he pointed out that the genitive of -us is -i, not -ae.