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1 April 2011 Two New Eimerians (Apicomplexa) from Insectivorous Mammals in Madagascar
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Abstract
Fecal samples from 126 insectivorous mammals in Madagascar were collected between spring 1999 and fall 2001. In the Afrosoricida, 21 species in 5 genera were sampled, including 17 species of Microgale (31/96, 32% infected), Hemicentetes semispinosus (1/2, 50%), Oryzorictes hova (1/5, 20%), Setifer setosus (8/13, 61.5%), and Tenrec ecaudatus (5/8, 62.5%); in the Soricomorpha, only Suncus murinus was examined and 1/2 (50%) were infected. Two morphotypes of eimeriid oocysts, representing 2 presumptive new species, were found in 47 (37%) infected animals; only 2 afrosoricid hosts (2% of all hosts, 4% of infected hosts) had both oocyst morphotypes. Sporulated oocysts of the first morphotype, Eimeria tenrececaudata n. sp., are subspheroidal, 18.8 × 17.4 (17–22 × 15–20), with a length∶width ratio (L/W) of 1.1 (1.0–1.2); they lack a micropyle but may contain 0–2 polar granules and a single, small round oocyst residuum, 3 × 2.3. Sporocysts are lemon-shaped, 9.9 × 6.6 (9–11 × 5–8), with a L/W of 1.5 (1.2–2.0); they have a prominent, slightly flattened Stieda body and a substieda body but lack a parastieda body. The sporocyst residuum consists of only a few granules between the sporozoites, which are sausage-shaped and have a large posterior refractile body. Oocysts of the second morphotype, Eimeria setifersetosa n. sp. are spheroidal to subspheroidal, 30.1 × 28.6 (27–34 × 25–34), with a L/W of 1.1 (1.0–1.2); they lack both micropyle and oocyst residuum, but 1–2 polar granules are usually present. Sporocysts are subspheroidal to broadly ellipsoidal, 9.6 × 7.3 (9–11 × 6–8), with a L/W of 1.3 (1.1–1.7); they have a broad Stieda body, lack sub- and parastieda bodies, and have a residuum of a few granules scattered throughout the sporocyst. Sporozoites were not clearly defined, but what seemed to be a single large refractile body is seen, presumably in each sporozoite.
Lee Couch, Juha Laakkonen, Steven Goodman and Donald W. Duszynski "Two New Eimerians (Apicomplexa) from Insectivorous Mammals in Madagascar," Journal of Parasitology 97(2), (1 April 2011). https://doi.org/10.1645/GE-2611.1
Received: 24 July 2010; Accepted: 1 October 2010; Published: 1 April 2011
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