Merogonic Development of Haemogregarina balli (Apicomplexa: Adeleina: Haemogregarinidae) in the Leech Placobdella ornata (Glossiphoniidae), Its Transmission to a Chelonian Intermediate Host and Phylogenetic Implications

A new fish haemogregarine from South Africa and its suspected dual transmission with trypanosomes by a marine leech

“…Stages of H. curvata, but not trypanosomes, were also observed in the salivary gland cells of Z. arugamensis in close proximity to the proboscis. These forms resembled those of fish haemogregarines described from the salivary gland cells of other marine leeches (So 1972, Khan et al 1980, Siddall and Desser 1991, 1993.…”

“…Siddall and Desser (1993), and Siddall and Burreson (1994) both reported developmental stages of fish haemogregarines in the sinus system of marine leeches. Chelonian haemogregarines have also been detected in the blood sinuses of leech vectors (Seigel 1903, Robertson 1910, Siddall and Desser 1991. Stages of H. curvata, but not trypanosomes, were also observed in the salivary gland cells of Z. arugamensis in close proximity to the proboscis.…”

Ultrastructural features of the gametogenic and sporogonic development ofHepatozoon sipedon(Apicomplexa: Adeleorina) The applicability of ultrastructural data in differentiating amongHepatozoonspecies

“…Other members of the genus undergo sexual development and sporogony in the gut wall of a mite, as is the case with the lizard parasite, H. lygosomarum (see Allison & Desser, 1981) or a tick, as observed with the tortoise haemogregarine, H. mauritanicum (see Michel, 1973). The gut as a develop mental location for gametogony and sporogony is similar to that of more derived adeleorins (Barta, 1989;Siddall & Desser, 1991 ;Siddall, 1995), including spe cies of Karyolysus (see Svahn, 1975), Desseria (see Sid dall & Desser, 1992), Cyrilia (see Lainson, 1981), Hae mogregarina (see Siddall & Desser, 1990), and Babesiosoma (see Barta & Desser, 1989). In a phylogenetic analysis of the genus Hepatozoon and related haemogregarine taxa (Smith & Desser, in press), in which the developmental location of sporogony was used as a character, it was found that H. lygosomarum, H. mauritanicum, the remaining haemogregarine taxa and the dactylosomatids form a monophyletic group that is the sister clade to a monophyletic group of Hepatozoon species that develop in the haemocoel of the invertebrate host.…”

“…Biflagellated microgametes are the most common state (Mackerras, 1962;Landau et al, 1970;Ball & Oda, 1971;Lowichik et al, 1993;Desser et al, 1995), but uniflagellated microgametes have been reported (Gôbel & Krampitz, 1982 ;Bashtar et al, 1984b;Bashtar et al, 1987), as have aflagellated forms (Michel, 1973). The biflagellated state is shared with the microgametes of eimeriorins, resulting in a less derived position for Hepatozoon in the phylogenetic analyses performed by Barta (1989), Siddall & Desser (1991) & Siddall (1995. The uniflagellated condition is similar to that observed in haemospororins (Garnham et al, 1967;Desser, 1970) and lower adeleorins of the genus Klossia (see Moltmann, 1981), while the afla gellated forms are characteristic of more highly derived adeleorins (Lainson, 1981;Siddall & Desser, 1990, 1992Barta, 199D. The flagella of Hepatozoon species have been shown in the present study and those by Bashtar et al (1984b), Lowichik et al (1993) and Desser et al (1995) to consist of unusual arrangements of single microtu bules, including 9 + 1, 8 + 2, 8 + 1, 7 + 1, and 4 + 0 forms, all of which deviate from the classical 9 + 2 arrangement of doublet microtubules seen in the microgametes of other apicomplexans (Scholtyseck et al, 1972).…”

Cytological And Molecular Identification Of Haemogregarina Stepanowi In Blood Samples Of The European Pond Turtle (Emys Orbicularis) From Quarantine At Belgrade Zoo

“…An infected leech feeding on reptiles injects merozoites into the bloodstream initiating the preerythrocytic merogony in the lungs, liver and spleen of the reptile host, producing about 18 merozoites. Secondary merogony takes place in the erythrocytes where different parasitic stages including the gamonts are formed [2,[7][8][9].…”