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  • Autor: R. K. Schuster x
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On two morphologically different cysticercoids of the genus Eurycestus (Cestoda: Dilepididae) in Artemia franciscana (Arthropoda: Artemiidae) in a hypersaline pond in Dubai, United Arab Emirates

Summary

During a survey on tapeworm larval stages in Artemia franciscana from an artificial pond in Dubai, United Arab Emirates, a high prevalence of Eurycestus avoceti-like cysticercoids was established. Adult male and female crustaceans showed a prevalence of 61.9 and 62.7 %, respectively. The intensity ranged from one to four and one to three cyst, respectively. Out of 215 examined cysticercoids, 207 specimens had morphological features matching with E. avoceti. The flaky structure of the surrounding capsule, the elongated shape of the cysticercoid and the larger number of hooklets on the suckers suggest that the eight further larval cestodes belonged to another species of the genus Eurycestus.

Open access
Preimaginal mortality of Musca domestica (Diptera: Muscidae) due to Habronema muscae (Nematoda: Habronematidae)

Summary

In order to study the damage of Habronema muscae (Carter, 1861) on its intermediate host, Musca domestica Linnaeus, 1758, fly larval feeding experiments were carried out. For this, a defined number of praeimaginal stages of M. domestica was transferred in daily intervals (from day 0 to day 10) on faecal samples of a naturally infected horse harboring 269 adult H. muscae in its stomach. The development of M. domestica was monitored until imagines appeared. Harvested pupae were measured and weighted and the success of infection was studied by counting 3rd stage nematode larvae in freshly hatched flies. In addition, time of pupation and duration of the whole development of the flies was noticed. Pupation, hatching and preimaginal mortality rates were calculated and the number of nematode larvae in freshly hatched flies was counted. Adult flies harboured up to 60 Habronema larvae. Lower pupal volumes and weights, lower pupation rates and higher preimaginal mortality rates were found in experimental groups with long exposure to parasite eggs compared to experimental groups with short exposure or to the uninfected control groups. Maggots of the former groups pupated earlier and fly imagines occurred earlier. These findings clearly showed a negative impact of H. muscae on the development of M. domestica. The results are discussed in connection with the destruction of adipose cells in the maggots by developing nematode larvae.

Open access
A New Species of Cloacitrema (Digenea, Philophthalmidae) from Greater Flamingo (Phoenicopterus roseus) with Remarks on the Genera Cloacitrema and Pygorchis

Abstract

Cloacitrema dubaiensis Schuster, sp. n. is described from four adult specimens found in the cloaca of greater flamingos in Dubai, UAE. It is the first Cloacitrema species found in the Afrotropic ecozone. The new species is medium‑sized and slim, with the ventral sucker in equatorial position and the uterus that extends laterally to intestinal caeca. It has oval, unlobed, touching each other testes in parallel to slightly oblique position. C. dubaiensis resembles C. narrabeenensis but differs in body shape, position of acetabulum, size of the seminal vesicle and number of vitelline follicles and their extension lateral to caeca.

Open access
Abattoir survey on extra-cerebral coenurosis in goats

Summary

Out of 19,046 goats aged between 5 and 6 month and slaughtered at an abattoir in Dubai between September 2012 and March 2014, 57 carcasses were objected at meat inspection due to the presence of bladder worms of the coenurus type. The majority showed single cysts that were cut out but 10 carcasses had to be discharged due to the presence of multiple cysts and with a maximum number of 41 coenuri. In the majority of carcasses, cysts were located in the legs (n=45) followed by abdominal muscles (n=16), diaphragm (n=14) and shoulder (n=13). Loin, rack, renal fat, heart, neck, masseter were other cyst locations. The size of the detected parasitic cysts ranged from 0.7 ml to 90 ml. The maximum number of 1,102 scolices was counted in an 86 ml coenurus found in the leg of a goat. Cysticercus tenuicollis was another cestode larval stage found in livers of 302 goats. A mixed infection with both parasites was detected in 35 carcasses.

Open access