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. 2011 Mar 31;6(3):e18163. doi: 10.1371/journal.pone.0018163

Figure 3. Light micrograph (LM) and scanning electron micrographs (SEM) showing the general morphology and surface ultrastructure of the gregarine Heliospora cf. longissima.

Figure 3

a. LM of a trophozoite with an elongated deutomerite (D), a short protomerite (PM), and an epimerite (arrowhead). The septum (arrow) is clearly visible. The spherical nucleus (N) is situated in the middle of the deutomerite. b. SEM of an association of two trophozoites in caudo-frontal syzygy. The junction (arrow) between primite (P) and satellite (S) is visible. The arrowhead marks the epimerite at the anterior end of the primite. c. Higher magnification SEM of the anterior end of the trophozoite with a bulb-like protomerite (PM). The epimerite (arrowhead) shows a prominent collar-like margin (arrowhead). Epicytic folds (double arrowhead) cover the protomerite and deutomerite. d. High magnification SEM of the epicytic folds (double arrowheads). The density of folds is around 3 folds/micron. e. Higher magnification SEM of the area between the primite (P) and satellite (S) of an association of two trophozoites. The junction (arrow) between the two trophozoites is clearly visible. Scale bars: Fig. 3a, 20 µm; Fig. 3b, 10 µm; Figs. 3c–e, 3 µm.