Eimeria fumeus Hertel and Duszynski, 1987

Type host: Sorex fumeus Miller, 1895, Smokey shrew.

Other hosts: Sorex pacificus Coues, 1877, Pacific shrew; Sorex unguiculatus Dobson, 1890, Long-claed shrew; Sorex vagrans Baird, 1858, Vagrant shrew.

Type locality: NORTH AMERICA: U.S.A., Vermont, Lamoille County, 6.4 kmE, 3.2 km S, Morrisville.

Geographic distribution: NORTH AMERICA: U.S.A., Massachusetts, New Mexico, Oregon, Vermont; ASIA: Japan, Hokkaido.

Description of oocyst: Oocyst shape: ellipsoid; number of walls: 2; wall thickness: ~1.0; wall characteristics: outer rough, yellow, ~2/3 of total thickness; L x W: 27.6 x 22.4 (25-32 x 20-25); L/W ratio: 1.2 (1.1-1.5); M: absent; OR: absent; PG: usually 1, but occasionally up to 4 fragments. Distinctive features of oocyst: none.

Description of sporocysts and sporozoites: Sporocyst shape: football-shaped, being slightly pointed at both ends; L x W: 15.1 x 8.8 (13-17 x 8-12); L/W ratio: 1.7 (1.3-2.3); SB: present; SSB: present, about the same width as SB; PSB: present at pointed end of sporocyst opposite SB; SR: present; SR characteristics: 1 large globule, ~4.0, or composed of several globules; SP: with distinct RB at one end, although this was not stated in the original description. Distinctive features of sporocyst: football shape and presence of Sb, SSB, and PSB.

Prevalence: 4/16 (25%) S. fumeus; 1/12 (8%) S. pacificua; 2/48 (4%) S. unguiculatus; 1/112 (<1%) S. vagrans.

Sporulation: Exogenous. Oocysts sporulated in 7-10 days in 2.5% (w/v) aqueous potassium dichromate solution at 23º C.

Prepatent and patent periods: Unknown.

Site of infection: Unknown. Oocysts recovered from feces and intestinal contents.

Materials deposited: Skin, skull, skeleon and tissues of the symbiotype host are preserved in the Mammal Division of the MSB, UNM: MSB No. 43318 (NK 3032,sex undetermined), R.M. Sullivan #484, 14 June 1980. Photosyntypes in the USNPC No 86348.

Remarks: Oocysts of this species are distinctive among those from insectivores being one of only 2, thus far, to have sporocysts with a PSB.

References: Hertel and Duszynski (1987).