Fig. 6 in A phylogenetically unresolved apicomplexan (APXSc) causing swirl lesions in the Tehuelche scallop, Aequipecten tehuelchus, from the Southwest Atlantic coast

Fig. 6. TEM microphotographs showing ectomerogony of APXSc. (A–E) Pleomorphic maturing meronts, dividing by ectomerogony. (A) A developing meront in schizogony, within a parasitophorous vacuole (Pv). (B–C) Higher magnification of visible centriole (Ce) from (A), indicative of mitosis. (B) A centriole characteristic for apicomplexans, i.e. with 9 singlet microtubules arranged in a circular fashion, usually there is also one in the middle, i.e. 9 + 1, but this looks like 9 + 0, which is also known. (C) Dividing centriole (Ce), mother- (upper Ce) and daughter (lower Ce) centrioles. (D) Pleomorphic, dividing meront. Note the duplication of the nucleolus (No) within the nucleus (N) and the formation of two adjacent centrioles by division (white arrowheads). (E) A meront during schizogony, with pairs of centrioles (white arrowheads) visible at various sites in the cell. Abbreviations: N = nucleus; No = nucleolus; Ce = centriole; Dg = dense granules; Am = amylopectin; R = rhoptries; Mn = micronemes; Pv = parasitophorous vacuole; Pvm = parasitophorous vacuolar membrane.