In theory there should be a strong coupling between host and parasite population sizes. Here, we investigated population size and structure in 3 species of acanthocephalans, Corynosoma semerne, C. strumosum and C. magdaleni, in ringed seals (Phoca hispida) from the Bothnian Bay over a period of more than 20 years. During this period, seal numbers first decreased markedly and then increased stea...

Amphibians of 24 species were surveyed for acanthocephalans in 4 nature reserves in 2 Chinese provinces during 2004–2006. Pseudoacanthocephalus bufonis (Echinorhynchida) occurred in both nature reserves in Guangxi Province. In the Jing Xi County Provincial Nature Reserve, P. bufonis infected 36 of 62 amphibians at a mean intensity of 9.9. Less than 250 km away, at Shiwandashan National Nature R...

The Palaeacanthocephala is traditionally represented by 2 orders, Echinorhynchida and Polymorphida, with 10 and 3 families, respectively. To test the monophyly of the class, these 2 orders, and certain families, phylogenies were inferred using nuclear small-subunit (SSU) and large-subunit (LSU) ribosomal DNA sequences obtained for 29 species representing 10 families, 2 other classes of acanthoc...

The objective of this work was to report the first seasonal occurrence of the acanthocephalan Quadrigyrus nickoli Schmidt & Hugghins, 1973 (Quadrigyridae), in the “Mato Grosso” Hyphessobrycon eques (Characidae) (Steindachner, 1882), collected from the Chumucuí River, state of Pará, Brazil. The fish were collected between July 2006 (rainy season) and June 2007 (dry season) and were examined for ...

The copulatory act in Acanthocephala requires a complicated set of responses on the part of the male worm. The muscles associated with these responses include a set of bursal protrusor muscles plus a large bursal depressor muscle which participates in the eversion of the bursa. The anterior and posterior bursal accessory muscles are associated with the bursal depressor muscle and are described ...

This study investigated the parasites of three species croakers (Pennahia anea, Panna microdon, and Johnius argentatus) their effect on host’s tissues. Fish samples were collected directly from local fishermen fish landing station Saint Martin’s Island, Bay Bengal a regular monthly basis. A total 448 individuals which nine identified including crustaceans, four nematodes, one pentastomida, acan...

Patterns of host use by parasites throughout a guild community of intermediate hosts can depend on several biological and ecological factors, including physiology, morphology, immunology, and behavior. We looked at parasite transmission in the intertidal crustacean community of Lower Portobello Bay, Dunedin, New Zealand, with the intent of: (1) mapping the flow of parasites throughout the major...

From August 2011 to November 2013, 68 opossums (8 Didelphis sp., 40 Didelphisvirginiana, 15 Didelphismarsupialis, and 5 Philanderopossum) were collected in 18 localities from 12 Mexican states. A total of 12,188 helminths representing 21 taxa were identified (6 trematodes, 2 cestodes, 3 acanthocephalans and 10 nematodes). Sixty-six new locality records, 9 new host records, and one species, the ...

A total of 284 specimens of Scianidae fishes Kathala axillaris and Nibea albida were collected from Parangipettai coastal waters southeast coast of India and examined for endohelminth parasites. Seven helminth species were recorded. Capillaria brevispicula, Porrocaecum reticulatum, Leppetascaris lutijani (Nematodes), Hemiurus appendiculatus, Stephanostomum triacanthi (Trematodes), Rhadinorhynch...

From April 1997 through April 1998, 128 raccoons (Procyon lotor (Linnaeus)) collected from 7 sites representing 4 physiographic areas in South Carolina were examined for gastrointestinal helminth parasites. Four species of nematodes (Gnathostoma procyonis (Chandler), Physaloptera rara Hall and Wigdor, Arthrocephahis lotoris (Schwartz), and Molineus barhatus Chandler) and 2 species of acanthocep...