The Life-history and Chromosome Cycle of Aggregata eberthi [Protozoa: Sporozoa: Coccidia]

Dobell, Clifford

doi:10.1017/s0031182000082184

Cited by 73 publications

(40 citation statements)

References 5 publications

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“…The prevalence of cysts of Aggregata octopiana in the gut of Palaemon elegans was approximately 63 %, a figure which comes close to that of 75 % obtained by Dobell (1925) …”

Section: Materials and Methods Prawns Andparasitessupporting

confidence: 85%

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Palaemon elegans, an intermediate host in the life-cycle of Aggregata octopiana

Arias¹,

Gestal²,

Rodríguez³

et al. 1998

Dis. Aquat. Org.

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“…The prevalence of cysts of Aggregata octopiana in the gut of Palaemon elegans was approximately 63 %, a figure which comes close to that of 75 % obtained by Dobell (1925) …”

Section: Materials and Methods Prawns Andparasitessupporting

confidence: 85%

“…In both hosts, the parasites are found in the intestinal epithelium or wall. The asexual phase is in the peri-intestinal tissue of Portunus depurator L., 1758 while the sexual phase occurs within cells of the submucous connective tissue of the caecum and intestine of Sepia officinalis L. 1758 (Dobell 1925).…”

mentioning

confidence: 99%

Palaemon elegans, an intermediate host in the life-cycle of Aggregata octopiana

Arias¹,

Gestal²,

Rodríguez³

et al. 1998

Dis. Aquat. Org.

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“…There are only five reports on the occurrence of rickettsia-like organisms in freshwater crayfish, all described in the parastacid Cherax quadricarinatus from Australia and Ecuador (Edgerton et al, 2002). Coccidia have not been found in crayfish at all (Meyers, 1990;Vogt, 1999;Edgerton et al, 2002), although members of the Aggregatidae (Eimeriida) seem to be quite common in marine decapods (Dobell, 1925;Meyers, 1990). These findings show that at least the feared role of the marbled crayfish as a potential transmitter of new pathogens into European waters is not only hypothetical, but real.…”

Section: The Marbled Crayfish-promising Model Organism or Potential Ementioning

confidence: 99%

Life stages and reproductive components of the Marmorkrebs (marbled crayfish), the first parthenogenetic decapod crustacean

Vogt

Tolley

Scholtz

2004

Journal of Morphology

116

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Recently, we briefly reported on the first case of parthenogenesis in the decapod Crustacea which was found in the Marmorkrebs or marbled crayfish, a cambarid species of unknown geographic origin and species identity. Curiously, this animal is known only from aquarium populations, where it explosively propagates. By means of light and electron microscopic techniques we have now investigated the reproductive components of this crayfish, using more than 100 specimens ranging from hatchling to repeatedly spawned adult. Additionally, we documented its principal life stages. Our results revealed that the external sexual characters and also the gonads of the marbled crayfish are purely female, making this fast-reproducing species a good model for investigating female reproductive features in crayfish. Testicular tissues, ovotestes, or male gonoducts, gonopores, or gonopods were never found, either in small juveniles or large adult specimens, confirming the parthenogenetic nature of this crayfish. Parthenogenesis may have arisen spontaneously or by interspecific hybridization since Wolbachia-like feminizing microorganisms were not found in the ovaries. The external sexual characters of the marbled crayfish are first recognized in Stage 4 juveniles and are structurally complete approximately 2 months after hatching in specimens of approximately 2 cm total length. In the same life stage the ovary is fully differentiated as well, although the oocytes are in previtellogenic and primary vitellogenic stages only. The architecture of the mature ovary and also the synchronous maturation of cohorts of primary vitellogenic oocytes by secondary vitellogenesis are in general agreement with data published on ovaries of bisexual crayfish. New results were obtained with respect to the muscular nature of the ovarian envelope and its extensive proliferation after the first spawning, the distribution of hemal sinuses in the ovarian envelope and in the interstitium around the oogenetic pouches, the high transport activity of the follicle cells, and the colonization of oogenetic pouches by previtellogenic oocytes that originate in the germaria. Investigation of the nuclei of oocytes in the germaria and oogenetic pouches revealed no signs of meiosis, as usually found in females of bisexual decapods, suggesting that parthenogenesis in the marbled crayfish might be an apomictic thelytoky. The detection of new rickettsial and coccidian infections in the ovary and further organs raises fears that the marbled crayfish might endanger native European species by transmission of pathogens once escaped into the wild.

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“…Asexual stages (merogony) are present in the digestive tracts of crustaceans, the intermediate hosts. The parasite is transmitted through the food-web (Dobell, 1925).…”

Section: Introductionmentioning

confidence: 99%

Aggregata andresi n. sp. (Apicomplexa: Aggregatidae) from the ommastrephid squid Martialia hyadesi in the SW Atlantic Ocean and some general remarks on Aggregata spp. in cephalopod hosts

et al. 2005

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A new species of coccidian, Aggregata andresi, is described from the digestive tract of the flying squid Martialia hyadesi, an ommastrephid squid that lives in cold subantarctic waters in the Southwest Atlantic. Gamogonic and sporogonic stages were observed in the digestive tract of 96.5% studied hosts. Oocysts were ovoid to subspheroid in shape, 170-590 microm in length and 200-530 microm in width. Each oocyst contained approximately 45,000 sporocysts. Sporocysts measured 9.5-10 microm in length and 8-8.5 microm in width. The surface of the sporocyst wall was smooth and the cyst wall thick. Each sporocyst contained three sporozoites measuring 16-20 microm in length and 2-2.5 microm width. A. andresi is the second species of Aggregata to be reported from a nerito-oceanic cephalopod host.

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The Life-history and Chromosome Cycle of Aggregata eberthi [Protozoa: Sporozoa: Coccidia]

Abstract: PAGE 1 Frenzel's "Aggregata portunidarum" comprised the schizogonous forms of A. eberthi (in P. arcuatus) and of the Aggregata (? sp.) found in Carcinus maenas, together with the gregarine

Cited by 73 publications

References 5 publications

Palaemon elegans, an intermediate host in the life-cycle of Aggregata octopiana

Palaemon elegans, an intermediate host in the life-cycle of Aggregata octopiana

Life stages and reproductive components of the Marmorkrebs (marbled crayfish), the first parthenogenetic decapod crustacean

Aggregata andresi n. sp. (Apicomplexa: Aggregatidae) from the ommastrephid squid Martialia hyadesi in the SW Atlantic Ocean and some general remarks on Aggregata spp. in cephalopod hosts

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