Complex species structure of (Digenea: Lecithasteridae), a fish parasite in the Arctic and Pacific Northwest.

Studying complexes of cryptic or pseudocryptic species opens new horizons for the understanding of speciation processes, an important yet vague issue for the digeneans. We investigated a hemiuroidean trematode across a wide geographic range including the northern European seas (White, Barents, and Pechora), East Siberian Sea, and the Pacific Northwest (Sea of Okhotsk and Sea of Japan). The goals were to explore the genetic diversity within through mitochondrial ( and genes) and ribosomal (ITS1, ITS2, 28S rDNA) marker sequences, to study morphometry of maritae, and to revise the life cycle data.

Wood-Inhabiting Nematode, sp. n. (Nematoda: Aphelenchoididae) from David Elm, with Molecular Phylogeny of the Genus Based on Partial Mitochondrial Genomes.

A new nematode species, sp. n. is described in the bark beetle-elm tree association ( and var.

: Updates on egg morphology, host range, and distribution.

During a survey for helminths in reindeer () across the Palearctic region, eggs were found in zoo reindeer feces. These were identified as eggs of based on their morphology, morphometrics, location, and analysis of their partial sequence of ITS rDNA region. Some of the eggs had an appendage, previously unreported.

Complete Mitochondrial Genome of Clupeonella abrau (Maliatsky, 1930) (Clupeiformes), an Endemic Freshwater Fish from the Lake Abrau (Russia).

The Abrau sprat (tyulka or sardelka) Clupeonella abrau (Maliatsky, 1930) is an endemic fish of the Lake Abrau (Krasnodar Krai, Russia). The full C. abrau mitochondrial genome (16 650 bp) showed a gene arrangement conserved in Clupeidae and 98.

Two Lineages of Oribatid Mites Morphologically Correspond to the Circumpolar Species Ameronothrus nigrofemoratus (Acari, Oribatida) but Differ Genetically as Distinct Species Are Revealed on the Kolguev Island.

Data reported from Northern Canada were until recently the only available data on the genetic characteristics of the oribatid mite Ameronothrus nigrofemoratus, which has a circumpolar distribution on the coasts of Arctic seas. A partial cytochrome oxidase I gene (COI) mtDNA sequence was examined in mites morphologically assigned to this species from the Kolguev Island. Two highly divergent phylogenetic lineages of A.