Isospora lamoillensis Duszynski, 1989
Type host: Condylura cristata (Linnaeus, 1758), Star-nosed mole.
Other hosts: None reported to date.
Type locality: NORTH AMERICA: USA, Vermont, Lamoille Co., 6.4 km E, 3.2 km S Morrisville.
Geographic distribution: NORTH AMERICA: USA, Oio, Vermont.
Description of oocyst:
Oocyst shape: ellipsoid, tapering toward both ends;
number of walls: only 1 obvious layer;
wall thickness: ~1.5;
wall characteristics: smooth;
L x W: 21.6 x 13.0 (19-23 x 11-14);
L/W ratio: 1.7 (1.4-1.8);
Distinctive features of oocyst: ellipsoid shape tapering at both ends.
Description of sporocysts and sporozoites:
Sporocyst shape: spindle-shaped, tapering to a point at one end;
L x W: 14.9 x 7.7 (14-16 x 7-8);
L/W ratio: 1.95 (1.8-2.2);
SB: present, prominent and wide;
SR characteristics: many dispersed granules of various sizes;
SP: with 1 RB at mid-body.
Distinctive features of sporocyst: spindle-shape with prominent SB, but no SSB.
Prevalence: 2/24 (8%), including 1/6 (17%) from Ohio and 1/12 (8%) from Vermont, but 0/2 from Maine and 0/4 from Massachusetts.
Sporulation: Exogenous. Oocysts sporulated in 7-10 in 2.5% aqueous (w/v) potassium dichromate solution at ~23 C.
Prepatent and patent periods: Unknown.
Site of infection: Unknown. Oocysts recovered from feces and intestinal contents.
Materials deposited: Skin, skull, skeleton and tissues of the symbiotype host are preserved in the Mammal Division of the Museum of SW Biology, UNM: MSB No. 43323 (NK 3055, female), R.M. Sullivan #488, 17 June, 1980. Photosyntypes in the USNPC No. 80628.
Remarks: Sporulated oocysts of this species most closely resemble those of I. sporopointaea Duszynski and Wattam, 1988 and I. talpae Agostinucci, 1955. They differ from the former by lacking a mammillated outer wall, but by having a PG (vs none), by having larger oocysts with a larger L/W ratio (1.7 vs 1.5) and by lacking a SSB. They differ from the latter by lacking a M, by having a PG, by the shape of the SB (flat vs nipple-like), and by having sporocysts that are pointed at the end opposite the SB (vs rounded).
References: Duszynski (1989).