Type host: Nycticeius humeralis Rafinesque, 1818, Evening bat.

Other hosts: None reported to date.

Type locality: NORTH AMERICA: USA, South Carolina, Richland Co., Fort Jackson, South Carolina Army National Guard Leesburg Training, Red Diamond Road Bridge over Colonel's Creek.

Geographic distribution: NORTH AMERICA: USA, South Carolina.

Description of oocyst: Oocyst shape: subspheroidal; number of walls: 2; wall thickness: 1.3-1.5; wall characteristics: outer, yellowish, mammillated, and gives a striated appearance in optical cross-section, ~1/2 of total thickness; inner, dark, smooth; L x W: 22.4 x 18.0 (21-24 x 17-20); L/W ratio: 1.3 (1.1-1.5); M: absent; OR: absent; PG: 1-3. Distinctive features of oocyst: uniformly mammillated outer layer of wall which gives striated appearance in optical cross-section.

Description of sporocysts and sporozoites: Sporocyst shape: ovoidal; L x W: 10.9 x 7.7 (9-12 x 6-8); L/W ratio: 1.4 (1.2-1.6); SB: present; SSB: absent; PSB: absent; SR: present; SR characteristics: composed of a granular mass sometimes obscuring SP; SP: at least 1 RB located either at the end or in the middle of the SP. Distinctive features of sporocyst: none.

Prevalence: 2/2 (100%).

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 released after it was measured and identified and feces collected. Photosyntypes of sporulated oocysts in the USNPC No. 88101.

Remarks: The sporulated oocysts of this species are most similar to those of E. macyi, E. rioarribaensis, E. eumopos, and E. californicensis in that they all have a rough outer oocyst wall and all lack an OR. However, E. macyi and E. rioarribaensis have a SSB that E. jacksonensis lacks, and E. eumopos is much larger than E. jacksonensis (35 x 28 vs 22 x 18) and has a thicker oocyst wall (1.9 vs 1.4). The differences between oocysts of this species and those of E. californicensis are very subtle. In addition to host genus and geographic separation, the number (1-3 vs 1-7) and size (large vs tiny) of the PG differs between the two species as do the L/W ratios (1.3 vs 1.1) of their oocysts and granulation, size, and distribution of their SR. .

References: Duszynski et al. (1999).