Showing papers in "Angewandte Parasitologie in 1975"

On cestodes of Passer domesticus. I. Choanotaenia, Raillietina and Proparuterina.

Abstract: An investigation on the cestode fauna of the common sparrow, Passer domesticus (Linnaeus) was carried out for about five years. In all 445 birds were examined during this period and only five species of cestodes were found to parasitize this bird: of these, three are known while two are new forms, the latter are the rarities. This part includes critical accounts of Choanotaenia passerina (Fuhrmann, 1907), Raillietine (R.) galeritae (Skrjabin, 1915) and Proparuterina lali sp. nov. - Choanotaenia passerina (Fuhrmann, 1907) has been previously studied by Fuhrmann (1907), Johnston (1909), Stunkard & Milford (1937) and Kintner (1938). The present study provides additional data. The writers find two rows of rostellar hooks in the present material. Fuhrmann and Johnston reported two rows of rostellar hooks, but Kintner apparently found a single row of rostellar hooks. Variations have been found in the number of testes and extent of cirrus sac. Amongst the previous workers, only Johnston (1909) paid attention to study the protective coverings present around the hexacanth and described two envelopes, but the writers find three. - Raillietine (R.) galeritae (Skrjabin, 1915) has been restudied and redescribed from fresh material. Previously Mahon (1958) studied this species from P. domesticus. The present account includes important variations and some additions too. Suckers have been found to be armed in contradiction to what Mahon stated. Gravid proglottides have been found to develop a velum. Egg capsules contain 3-13 eggs each. Two protective envelopes have been found around the hexacanth. This is the first record of the occurrence of this species in P. domesticus in India. Proparuterina lali sp. nov. is a rare parasite of Passer domesticus. Only one more species viz. P. aruensis Fuhrmann, 1911 is known. The present species differs from P. aruensis in the number and distribution of testes, bilobed nature and median position of ovary, position of vitellarium and of genital pore. The generic diagnosis of Proparuterina Fuhrmann, 1911 has been amended in the light of the morphology of the present species.

[Dicrocoelium dendriticum in sheep in the Democratic Republic of Germany district of Frankfurt/Oder].

Abstract: In the district of Frankfurt/Oder of the German Democratic Republic, faecal examinations of 143 sheep stocks revealed a 31.3 percent infection with Dicrocoelium dendriticum. In different territories of the district, the intensity of the infection with Dicrocoelium dendriticum varied remarkably. Detailed investigations demonstrated, that the parasite was limited to pastures with Brownearth soil. Routine examinations revealed the fact, that the egg-output of Dicrocoelium dendritcum was very variable during the pasture season. During the whole time of the examinations, the authors found eggs in the faeces of sheep belonging to Dicrocoelium dendriticun. In the German Democratic Republic, this helminth species is not restricted to hills with limestones. It occurs also in lowlands with small amounts of lime like the Brown-earth zones of the district Frankfurt/Oder.

Histology of the larval intestinal tract of the goat warble fly Przhevalskiana silenus

Abstract: The goat warble fly from Afghanistan studied in the present paper should be named Przhevalskiana silenus (Brauer) (=Crivellia silenus Brauer) according to recent studies (Wetzel 1972). In the present paper the histology of the gut of all three larval stages is described. Pharynx and oesophagus are well developed in L1. There are no important histological differences to L2 and L3. In contrast to L2 and L3 in L1 the mid gut runs down in a straight line without any looping. There is a cell clot in the first stage which is not present in the second and third one. While in L1 the lumen of the gut is filled with a fine astructural mass there are many blood cells to be found in the gut lumen of L2 beside other nutritive substances. The mid gut in this stage shows a clear histological and functional differentiation in three main sections. The cells of the first and third section secernate, while the second section does not possess secernating cells at all. In L3 there is no secretory activity in the first section of the mid gut at any time, while the cells of all the rest of the mid gut show a merocrine secretion. Neither in L2 nor in L3 any of the two types of cells differing in size in the mid gut's (ED2) epithelium ever secernates. In the mid gut of L1 unspecific esterases have been found. In L2 the same enzymes are produced in the same place. In addition proteins are produced in the salivary glands. They obviously get secernated by the second portion of the salivary glands, which are developed in this stage.