Fifteen fecal samples from peacocks (Pavo cristatus) in Saudi Arabia contained oocysts of Eimeria riyadhae n. sp. in two peacocks and oocysts of E. arabica n. sp. in one peacock. Sporulated oocysts of Eimeria riyadhae are ellipsoidal, 27-30.5 x 20.5-25 (28.8 +/- 1.3 x 22.4 +/- 1.6) micron, with a two-layered wall and bilobed polar body, but without a micropyle or residuum. The sporocysts are ov...

From June to August 1993, fecal samples were collected from the intestinal tract of 13 juvenile, 4 pre-adult, and 25 adult capybaras (hydrochaeris hydrochaeris L.) from 10 localities in eastern Bolivia; additionally, 19 fresh fecal samples were collected in 1994 from capybara herds at 2 localities in south central Venezuela. Oocysts of 3 eimerians were recovered from the capybara populations in...

Between September 1991 and March 1993, 25 moth skinks (Lipinia noctua) were collected from various localities on the Cook Islands, Fiji, Papua New Guinea (PNG), and Vanuatu and examined for coccidians. In addition, a single Roux's lipinia skink (Lipinia rouxi) was collected from PNG and examined for coccidia. Sixteen (64%) L. noctua were found to harbor 2 new eimerians, and L. rouxi harbored an...

Three new coccidian (Apicomplexa: Eimeriidae) species are reported from the lesser seed-finch, Oryzoborus angolensis from Brazil. Sporulated oocysts of Isospora curio n. sp. are spherical to subspherical; 24.6 x 23.6 (22-26 x 22-25) microm, shape-index (SI, length/width) of 1.04 (1.00-1.15). Oocyst wall is bilayerd, approximately 1.5 microm thick, smooth and colourless. Micropyle and oocyst res...

Tyzzeria parvula from the greylag goose (Anser anser) is described in Southeastern Brazil. Oocysts are spherical to subspherical ranging from 12.4-180 to 10.7-15.9 microm (15.4 X 13.4 microm), shape index 1.15, with a double layered wall 0.4 to 0.7 microm thick (n=20), outer smooth and colorless, inner pale greenish. Micropyle is absent, but oocyst residuum is present containing numerous granul...

The activation process in a variety of deuterostome and protostome eggs is accompanied by cytosolic calcium transients that usually take the form of either a single or multiple propagating waves. Here we report that the eggs of zebrafish (Danio rerio) are no exception in that they generate a single activation wave that traverses the egg at a velocity of around 9 microm/s. There appears, however...

A generalized concept in the Citrus genus is that highly polyembryonic varieties produce only a small number of hybrids. Small zygotic embryos congregate primarily near micropyle, while nucellar organize or away from micropyle. In present study, authors determined seeds, per seed, and largest embryo (LE) position five citrus cultivars: C35 citrange, Volkamer lemon, Amblycarpa mandarin, Minneola...

Fertilization involves an initial, highly localized signal delivered by the sperm, which becomes amplified by a signal transduction cascade to impact the entire oocyte cytoplasm. The zebrafish oocyte presents a unique opportunity to study this process since fertilization always occurs at the micropyle, allowing the investigator to image the earliest steps in the oocyte activation process. The o...