Type host: Myotis nigricans (Schinz, 1821), Little brown bat.

Other hosts: None reported to date.

Type locality: SOUTH AMERICA: Bolivia, Santa Cruz, 4.0 km S of Buena Vista, 17º 28' S, 63º 42' W.

Geographic distribution: SOUTH AMERICA: Bolivia, Santa Cruz.

Description of oocyst: Oocyst shape: spheroidal; number of walls: 2; wall thickness: ~1.3 (1.0-1.4); wall characteristics: outer, brownish, rough, ~2/3 of total thickness, but does not appear striated in optical cross-section; inner, smooth; L x W: 18.9 x 16.9 (17-23 x 14-20); L/W ratio: 1.1 (1.0-1.3); M: absent; OR: present; OR characteristics: 6-8 spheroidal globules dispersed throughout oocyst; PG: 1. Distinctive features of oocyst: none.

Description of sporocysts and sporozoites: Sporocyst shape: ovoidal; L x W: 10.1 x 7.4 (7-14 x 5-10); L/W ratio: 1.4 (1.0-2.1); SB: present, ~1.5; SSB: present, faint, ~3 wide, flat on bottom; PSB: absent; SR: present; SR characteristics: a mass of 3-4 round globules (~1.0 in diameter); SP: with 1 or 2 prominent RBs. Distinctive features of sporocyst: faint, wide SSB.

Prevalence: 2/4 (50%)

Sporulation: Presumably exogenous. Oocysts sporulated in 2% aqueous (w/v) potassium dichromate solution in the field.

Prepatent and patent periods: Unknown.

Site of infection: Unknown. Oocysts recovered from feces.

Materials deposited: Symbiotype host, M. nigricans, in the Museum of SW Biology, UNM: MSB 58759 (NK 15201, 2 August 1987). Photosyntypes in the USNPC No. 88105.

Remarks: The presence if a rough outer wall, SB and SSB make sporulated oocysts of E. nigricani similar to those of E. magnirostrumi and E. macyi. However, those of E. nigricani differ from E. magnirostrumi by having smaller oocysts (19 x 17 vs 24 x 21) with a rough, but not distinctly mammillated outer wall, by having an OR of dispersed globules, by having SP with 2 RBs (vs 1) and a SSB that is somewhat larger (3.0 vs 2.6) and flat, rather than rounded, at the bottom. They differ from those of E. macyi in more subtle ways: by the presence of a 2-layered wall (vs 1), the presence of an OR, and by having a SSB that is twice as wide as the SB vs one that is not wider than the SB and rounded at the bottom.

References: Duszynski et al. (1999).