Type host: Tarsius syrichta (Linnaeus, 1758) (syn. T. carbonarius), Philippine tarsier.

Other hosts: None reported to date.

Type locality: ASIA: Philippines, Mindanao.

Geographic distribution: ASIA: Philippines, Mindanao.

Description of oocyst: Oocyst shape: oval; number of walls: 1 (in line drawing); wall characteristics: smooth, "thin" (in line drawing); L x W: 15-18 x 10-13; M: absent (in line drawing); OR: present; OR characteristics: spheroidal mass of small and large granules (in line drawing); PG: absent. Distinctive features of oocyst: small size with large OR.

Description of sporocysts and sporozoites: Sporocyst shape: ellipsoid; SB: absent; SSB: absent; PSB absent; SR: absent; SP: elongate, with one end wider than the other, lying lengthwise head to tail in sporocyst. Distinctive features of the sporocyst: lack of SB, SR and RB.

Prevalence: 1/3 (33%).

Sporulation: Exogenous. Oocysts sporulated in 96 hrs, but the temperature is unknown.

Prepatent period: Unknown.

Patent period: Oocysts were passed for at least 15 days.

Site of Infection: Unknown. Oocysts recovered from feces.

Material deposited: None.

Remarks: This species was first seen when Osman Hill et al. (1952) reported the natural history and endoparasites of three T. carbonarius (2 females, 1 male) received by the Gardens of the Zoological Society of London in March, 1948. Only the male was found to pass oocysts, which they described; they also provided three line drawings (their Figs. 7-10), the latter, of a sporulated oocyst. Although their description of the sporulated oocysts is marginal by today's standards, when taken with the line drawings, we believe there is sufficient information to distinguish this form from other described species found in prosimian genera to date. Osman Hill et al. (1952) said the oocysts were "oval," but illustrated them as ellipsoid.

Reference: Osman Hill et al. (1952).