Figure 5

Pellicle architecture in Gregarina cuneata gamonts. A. Gamonts associated in syzygy; primite (p), satellite (s). SEM. The syzygy on the right is composed of one primite (p) and two satellites (s1, s2). B. Higher magnification of the junction between the posterior end of the primite deutomerite (d) and the apical part of the satellite protomerite (p). SEM. C. A detail of the junction (arrow) between folded pellicles covering the primite deutomerite (def) and satellite protomerite (pef). SEM. D. Organisation of linear epicytic folds covering the deutomerite. SEM. E. Higher magnification of the junction between the primite (p) and two satellites (s1, s2) shown in panel A. SEM. F. A higher magnification of deutomerite epicytic folds (ef); grooves (g) between folds, mucus drops (*). SEM. G. Cross section of deutomerite epicytic folds; grooves (g) with mucus (*) between folds (ef), 12-nm filaments (arrowhead), inner membrane complex (imc), internal lamina (double arrowhead), plasma membrane (pm), rippled dense structures (white arrowhead), unknown dense structure (arrow). TEM. H. Cross section of deutomerite epicytic folds (ef); internal lamina (double arrowhead), rib-like myonemes (arrowheads). TEM. I. Detailed view of an epicytic fold in cross section revealing filamentous connections (arrowheads) localised between the plasma membrane (pm) and inner membrane complex (imc). TEM. J. Cross section showing the organisation of the deutomerite pellicle; ectoplasmic network (arrows), epicytic folds (ef), duct (*), rib-like myonemes (arrowheads). The insect shows the micropore located in the groove between two epicytic folds. TEM. K. Organisation of the pellicle and ectoplasmic network (n) during gregarine movement; epicytic folds (ef), deutomerite (d), protomerite (p). TEM. L. Higher magnification of a septum (arrow) separating the protomerite (p) from the deutomerite (d); epicytic folds (ef). Note the ectoplasmic network (n) connected to the septum. TEM.