Anentome helena (von dem Busch in Philippi, 1847) is known among aquarium enthusiasts as the “assassin snail”, and is usually kept to prey on other snail species that are considered pests in home aquaria. There have been concerns that, given its prevalence in the ornamental pet trade, it is only a matter of time before this predator is introduced to the wild. We report the first occurrence of e...

Twenty-five samples of Bulimulus species are studied, partly from localities within their known distribution range, partly based on interceptions where the material originates from localities where the species seem to be recently introduced and non-native. Molecular study of cytochrome oxidase 1 (CO1) reveals the origin of some of these introductions, but is less conclusive for others. Four dif...

A molecular PCR study using DNA from 21 hydatid cysts was performed to determine which strain type is responsible for human infection in Peru. The mitochondrial cytochrome c oxidase subunit 1 (CO1) gene was amplified in 20 out of 21 samples, revealing that all but 1 sample (19/20, 95%) belonged to the common sheep strain (G1). The remaining samples belonged to the camel strain (G6). The G1 geno...

40 Echinococcus isolates from sheep and cattle in Southern Brazil were genetically analysed in order to obtain further data on the presence of different taxa of the Echinococcus granulosus complex. Differentiation was done using a PCR technique and sequencing of mitochondrial cytochrome c oxidase subunit 1 (CO1). Most samples (38) could be allocated to the sheep strain (G1) of E. granulosus, wh...

In these notes we investigate the ring of real polynomials in four variables, which are invariant under the action of the reflection groups [3, 4, 3] and [3, 3, 5]. It is well known that they are rationally generated in degree 2,6,8,12 and 2,12,20,30. We give a different proof of this fact by giving explicit equations for the generating polynomials. 0 Introduction There are four groups generate...

The American brine shrimp Artemia franciscana is important in aquaculture and has become invasive other continents, aided by dispersal via waterbirds. However, little known about processes underlying its genetic diversity population structure natural habitat North America. These processes, including local adaptation, are pivotal drivers of species distribution community structure, therefore cen...

Parasites, in particular trematodes (Platyhelminthes: Digenea), play major roles in the population dynamics and community structure of invertebrates on soft-sediment mudflats. Here, we provide a list of the 20 trematode species currently known to infect molluscs, crustaceans and polychaetes from Otago Harbour (New Zealand) soft-sediment intertidal areas, as well as information on their transmis...

Oriented soft magnetic hcp-Co1 - x Ir x films with a fixed thickness of 120 nm were fabricated. All prepared films exhibit soft magnetic properties but various magnetocrystalline anisotropies with the variation of Ir content. The measured data shows that diverse domain structures including the Néel wall, Bloch wall, and stripe domains present in a fixed film thickness. It is singular for the si...

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