scholarly journals Redescription of Echinuria hypognatha Wehr, 1937 (Nematoda; Acuariidae) including ecology and new hosts

2012 ◽  
Vol 49 (2) ◽  
pp. 82-86 ◽  
Author(s):  
K. Kavetska ◽  
A. Stapf ◽  
K. Królaczyk ◽  
E. Kalisińska
Keyword(s):  
Digestive Tract ◽  
General Information ◽  
Eastern Siberia ◽  
Anatomical Features ◽  
Ecological Characteristics ◽  
New Hosts ◽  
Northwestern Poland ◽  
Clangula Hyemalis

AbstractReports on the presence of Echinuria hypognatha Wehr, 1937 in Europe have so far provided only general information, and therefore we present further morphometric and ecological characteristics of this parasite. In this study, the examined nematodes were isolated from the digestive tract of 1 005 wild ducks, representing 17 species from the northwestern Poland. The anatomical features of the parasite were in principle consistent with the description of the species by its discoverer and reports in the available literature. Nematodes (505 individuals) were found in 2.5 % of the examined ducks, in five species wintering in Poland: Clangula hyemalis, Melanitta nigra, M. fusca, Mergellus albellus and Aythya fuligula. The exclusive locations of the nematode were the glands in the proventriculus. The highest incidence was recorded in Melanitta ducks, and the presence of this nematode only in birds wintering in Poland indicates that E. hypognatha is brought to Poland by birds migrating from the areas of Eastern Siberia.

TAXONOMIC AND BIOLOGICAL OBSERVATIONS ON STREPTOCARA CALIFORNICA (GEDOELST, 1919) GEDOELST AND LIÉGEOIS, 1922 AND THE GENUS STREPTOCARA (NEMATODA: ACUARIIDAE)

1964 ◽  
Vol 42 (5) ◽  
pp. 773-783 ◽  
Author(s):  
George G. Gibson
Keyword(s):  
Life Cycles ◽  
Fourth Stage ◽  
Melanitta Perspicillata ◽  
Mergus Serrator ◽  
Bucephala Islandica ◽  
Aythya Valisineria ◽  
New Hosts ◽  
Aythya Marila ◽  
Clangula Hyemalis ◽  
Highly Evolved

A detailed redescription is presented for adults of Streptocara californica (Gedoelst, 1919) Gedoelst and Liégeois, 1922 based on specimens from under the gizzard lining of a common scoter, Oidemia nigra (L.), from Vancouver, Canada. Adult S. californica are here reported from the type host, Melanitta deglandi (Bonap.), and from the following new hosts near Vancouver: Anas platyrhynchos L., Aythya valisineria (Wilson), Bucephala islandica (Gmelin), Clangula hyemalis (L.), Melanitta perspicillata (L.), and Mergus serrator L. A description of the fourth-stage larvae is presented, based on specimens from Aythya marila (L.), Melanitta perspicillata (L.), and Mergus merganser L. from the same region. Yseria californica Gedoelst, 1919; Korjakinema gusi Oschmarin, 1950; Streptocara dogieli Belopolskaya, 1952; and Skrjabinobronema californicum (Gedoelst, 1919) Yamaguti, 1961 are considered synonyms of Streptocara californica. A comparison of the prevalence of S. californica with that of S. crassicauda charadrii Skrjabin, 1916 seems to indicate rather different life cycles for the two species. It is suggested that the genus Streptocara may be more highly evolved than the other genera of the Seuratiinae.

scholarly journals Red Octopus, Octopus rubescens Berry, 1953 (Cephalopoda: Octopodidae), in the Mexican tropical Pacific

Check List ◽  
2021 ◽  
Vol 17 (4) ◽  
pp. 1107-1112
Author(s):  
María del Carmen Alejo-Plata ◽  
Miguel A. Del Río-Portilla ◽  
Oscar Illescas-Espinosa ◽  
Omar Valencia-Méndez
Keyword(s):  
North America ◽  
Digestive Tract ◽  
Pacific Coast ◽  
First Record ◽  
Tropical Pacific ◽  
Western Coast ◽  
Morphometric Characters ◽  
Mexican Pacific ◽  
Tropical Waters ◽  
Anatomical Features

“Octopus” rubescens Berry, 1953 is an octopus of temperate waters of the western coast of North America. This paper presents the first record of “O.” rubescens from the tropical Mexican Pacific. Twelve octopuses were studied; 10 were collected in tide pools from five localities and two mature males were caught by fishermen in Oaxaca. We used morphometric characters and anatomical features of the digestive tract to identify the species. The five localities along the Mexican Pacific coast provide solid evidence that populations of this species have become established in tropical waters.

scholarly journals The first data on bat ectoparasites (Acarina, Insecta) in the Baikal region and Yakutia (eastern Siberia)

Check List ◽  
2016 ◽  
Vol 12 (4) ◽  
pp. 1943 ◽  
Author(s):  
Maria V. Orlova ◽  
Denis V. Kazakov ◽  
Evgeny S. Zakhahrov ◽  
Irina S. Troeva ◽  
Leonid N. Vladimirov
Keyword(s):  
Baikal Region ◽  
Eastern Siberia ◽  
Gamasid Mites ◽  
New Hosts

This paper summarizes new data on ectoparasites from bats (Chiroptera: Vespertilionidae) from eastern Siberia (Russia). The existence of 14 bat ectoparasite species is confirmed for this territory, including eight species of gamasid mites (Gamasina: Spinturnicidae, Macronyssidae) and six species of insects belonging to two orders (Insecta: Diptera, Siphonaptera). The bedbugs (Insecta: Heteroptera: Cimicidae) found are undefined. These findings include six species (one species of gamasid mites and five species of insects) not previously reported from eastern Siberia. New hosts are described for some ectoparasites.

Mitochondrial Reconstructions Based on Serial Thick Sections and HVEM

1975 ◽  
Vol 33 ◽  
pp. 286-287
Author(s):  
Jerome J. Paulin
Keyword(s):  
Imaging Techniques ◽  
Three Dimensional ◽  
Posterior Pole ◽  
Dimensional Structure ◽  
Stereo Imaging ◽  
Thin Sections ◽  
Anatomical Features ◽  
The Past ◽  
Cellular Components ◽  
Mitochondrial Reticulum

Within the past decade it has become apparent that HVEM offers the biologist a means to explore the three-dimensional structure of cells and/or organelles. Stereo-imaging of thick sections (e.g. 0.25-10 μm) not only reveals anatomical features of cellular components, but also reduces errors of interpretation associated with overlap of structures seen in thick sections. Concomitant with stereo-imaging techniques conventional serial Sectioning methods developed with thin sections have been adopted to serial thick sections (≥ 0.25 μm). Three-dimensional reconstructions of the chondriome of several species of trypanosomatid flagellates have been made from tracings of mitochondrial profiles on cellulose acetate sheets. The sheets are flooded with acetone, gluing them together, and the model sawed from the composite and redrawn.The extensive mitochondrial reticulum can be seen in consecutive thick sections of (0.25 μm thick) Crithidia fasciculata (Figs. 1-2). Profiles of the mitochondrion are distinguishable from the anterior apex of the cell (small arrow, Fig. 1) to the posterior pole (small arrow, Fig. 2).

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