Type host:Marmota menzbieri (Kashkarov, 1925).

Type locality: Asia: Kazakhstan.

Description of oocyst: Oocyst shape: ovoid; wall thickness: 1.2- 2.1; layers: 2; outer layer proportion of total thickness: not given; outer layer colour: yellow-brown or yellow-orange; outer layer texture: smooth; inner wall characteristics: dark in drawing; micropyle: present; micropyle width: not given; MC: absent; OR: absent; PG: absent; size: 23.7 x 21.1 (18-28 x 13-24); L/W ratio: 1.1 (1.1-1.4). Distinctive features of oocyst: large micropyle (in drawing).

Description of sporocysts and sporozoites: Sporocyst shape: ovoid; size: 9.4 x 6.7 (8-11 x 6-8); SB: unknown; SB L x W: not given; SB characteristics: not shown (in drawing), but the description indicates a SB is present; SSB: absent; PSB: absent; SR: present; SR characteristics: globules arranged peripherally in sporocyst, but shown between SP in drawing; SR size: not given; SP: refractile globules present at ends. Distinctive features of sporocyst: none.

Remarks: The sporulated oocyst resembles that of E. os, but has a dark inner wall (Svanbaev, 1963 drawing) that E. os lacks. Svanbaev (1964) wrote a second paper describing E. menzbieri as new, even though he had already described it in 1963.

References: Svanbaev (1963, 1964).