Type host: Myotis lucifugus Le Conte, 1831, Little brown bat.

Other hosts: Myotis yumanensis H. Allen, 1862, Yuma myotis.

Type locality: NORTH AMERICA: USA, New Mexico, Catron Co., Gila National Forest, Bill Lewis Cienega, 33º 27.6' N, 108º 37.9' W.

Geographic distribution: NORTH AMERICA: USA, New Mexico.

Description of oocyst: Oocyst shape: ovoidal; number of walls: 2; wall thickness: <1.0; wall characteristics: outer, rough, 1/2 of total thickness; inner, dark, smooth; L x W: 22.2 x 14.8 (18-25 x 14-17); L/W ratio: 1.5 (1.3-1.7); M: present, ~2 wide, usually asymmetrically located near more pointed end of oocyst, but not seen in unsporulated oocysts; OR: absent; PG: 1-4. Distinctive features of oocyst: presence of asymmetrically located M.

Description of sporocysts and sporozoites: Sporocyst shape: football-shaped; L x W: 8.1 x 6.6 (8-11 x 5-7); L/W ratio: 1.2 (1.1-1.8); SB: present; SSB: absent; PSB: absent; SR: present; SR characteristics: a spheroidal granular mass sometimes obscuring SP; SP: obscured by SR. Distinctive features of sporocyst: football-shape with ditinct SB at one end and spheroid granular SR.

Prevalence: 3/27 (11%) type host; 8/29 (28%) M. yumanensis.

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: Myotis lucifugus in the Museum of SW Biology, UNM: (NK 27793), 144 P. Case (RGZ), 9 August 1995; parasymbiotypes: NK 14883, female, 584 D.T. Scott, 8 August 1995, NK 14884, female, 585 D.T. Scott, 8 August 1995. Photosyntypes of the sporulated oocyst in the USNPC No. 86938.

Remarks: This species differs from other bat eimerians except E. andamanensis (?) and E. levinei (?) by having a M; E. catronensis differs from E. andamensis by being ovoidal rather than spheroidal and has 1-4 PGs; it differs from E. levinei by lacking an OR. Also, it is questionable (see their descriptions) if E. andamensis and E. levinei actually have a M.

References: Scott and Duszynski (1997).