“Acroeimeria”的意思、由来-开放百科全书

The defining feature of this genus is their development, after becoming enclosed by extensions

of the host cell membrane, within the resulting parasitophorous 'sack' which bulges out above the surface of the intestinal mucosa. This pattern of development is not known to occur in birds or mammals but is common in fish.

The endogenous development of the parasite is intra-cytoplasmic, within the epithelial cells of the ileum. The parasites lie above (closer to the lumen) the host cell nucleus. Below the parasitophorous vacuole, the host cytoplasm expands as the volume of the parasite increases, giving rise to a short, stalk-like structure.

The merozoite enters a gap formed in the host cell's brush border and then becomes enclosed by extensions of the host cell wall. A second, interior membrane is formed beneath the wall of the parasitophorous vacuole and this membrane is either confined to the proximal part of the parasitophorous vacuole or is ruptured distally. This membrane is retained throughout the growth and differentiation of the parasite.

Meront: These possess all the typical features of the Apicomplexia including an apical complex,

sub-pellicular tubules and micronemes. Young meronts are bound by a single membrane,

Macrogamont: Young macrogamonts possess a large, vesicular nucleus with a conspicuous central nucleolus. The cytoplasm contains a bilobed medium-density granular inclusion. The cytoplasm is densely packed with ribosomes and has a dense endoplasmic reticulum. The nucleus of The parasite

is fringed by numerous adnuclear bodies. In the late stages of maturation, the cytoplasm becomes filled with amylopectin granules. The macrogamonts are bound by a single unit membrane, coated by a variable amount of glycocalyx.

Oocyte: The oocysts possess four sporocysts each containing two sporozoites. Like most of the Eimeria species infecting reptiles the sporocysts of these species lack both Stieda bodies and substieda bodies.

Host-parasite relations

References

1. ^{{cite journal|author=Paperna A, Landsberg GH |title=Description and taxonomic discussion of eimerian coccidia from African and Levantine geckoes |journal=South African J. Zool. |volume=24 |issue=4 |pages=345–355 |year=1989 |doi=10.1080/02541858.1989.11448176}}
2. ^¹{{cite journal |author=Lainson R |title=Intestinal coccidia (Apicomplexa: Eimeriidae) of Brazilian lizards. Eimeria carmelinoi n.sp., from Kentropyx calcarata and Acroeimeria paraensis n.sp. from Cnemidophorus lemniscatus lemniscatus (Lacertilia: Teiidae) |journal=Mem. Inst. Oswaldo Cruz |volume=97 |issue=2 |pages=227–37 |date=March 2002 |pmid=12016449 |doi=10.1590/s0074-02762002000200016}}
3. ^{{cite journal |author=Lainson R, Paperna I |title=Some coccidia from the gall-bladder and intestine of the teiid lizard Ameiva ameiva ameiva and the gecko Hemidactylus mabouia in north Brazil |journal=Parasite |volume=6 |issue=2 |pages=151–62 |date=June 1999 |pmid=10416189 |doi=10.1051/parasite/1999062151}}
4. ^{{cite journal |author=Modrý D, Jirků M |title=Three new species of coccidia (Apicomplexa: Eimeriorina) from the Marble-throated skink, Marmorosphax tricolor Bavay, 1869 (Reptilia: Scincidae), endemic to New Caledonia with a taxonomic revision of Eimeria spp. from scincid hosts |journal=Parasitol. Res. |volume=99 |issue=4 |pages=419–28 |date=September 2006 |pmid=16596416 |doi=10.1007/s00436-005-0106-7 }}

General features

Host-parasite relations

References