Studies on the Life History of Brachylaimus oesophagei Shaldybin, 1953 (Digenea: Brachylaimidae)

1969 ◽  
Vol 43 (1-2) ◽  
pp. 79-98 ◽  
Author(s):  
J. W. Lewis
Keyword(s):  
Life History ◽  
Digestive Gland ◽  
Related Species ◽  
Life Histories ◽  
Common Shrew ◽  
Sorex Araneus ◽  
Morphological Features ◽  
Closely Related Species ◽  
History Of ◽  
The Common

1. Brachylaimus oesophagei Shaldybin, 1953 from the common shrew, Sorex araneus castaneus Jenyns is described and compared with that of Shaldybin (1953) and a closely related species B. fulvus Dujardin, 1843.2. Despite unsuccessful attempts in hatching the egg of B. oesophagei, some morphological features of the miracidium are described and compared with previous studies on brachylaimid miracidia. Neither flame cells nor epidermal plates have been observed in miracidia of this family and present observations confirm this.3. A description is given of the cercaria and metacercaria of B. oesophagei from the kidney of the hollowed snail Zonitoides excavatus (Bean) at Aberystwyth, but no sporocysts or cercariae were found in the digestive gland.4. Previous work on brachylaimid life histories is discussed, together with a resumé of the life history of B. oesophagei.

A comparative study of the life histories of Nematodirus battus and N. filicollis, nematode parasites of sheep

Parasitology ◽  
1959 ◽  
Vol 49 (3-4) ◽  
pp. 374-386 ◽  
Author(s):  
R. J. Thomas
Keyword(s):  
Life History ◽  
Intestinal Mucosa ◽  
Related Species ◽  
Life Histories ◽  
Basic Pattern ◽  
Culture Methods ◽  
Closely Related Species ◽  
Nematode Parasites ◽  
History Of ◽  
Comparative Description

1. The life history of N. battus is described, and a comparative description of the life history of N. filicollis is given.2. The life histories of these two species are compared with those of N. spathiger and N. helvetianus, two closely related species, and are shown to follow the same basic pattern, with minor variations in timing which appear to be specific in nature, and not related to differences in culture methods or host species.3. The pathogenesis of Nematodirus species is discussed and related to the migration of larvae into the intestinal mucosa during development.

scholarly journals The evolutionary history of the two karyotypic groups of the common shrew, Sorex araneus, in Poland

Heredity ◽  
2002 ◽  
Vol 88 (4) ◽  
pp. 235-242 ◽  
Author(s):  
M Ratkiewicz ◽  
S Fedyk ◽  
A Banaszek ◽  
L Gielly ◽  
W Chȩtnicki ◽  
...  
Keyword(s):  
Evolutionary History ◽  
Common Shrew ◽  
Sorex Araneus ◽  
History Of ◽  
The Common ◽  
Common Shrew Sorex Araneus

Colonies as dynamic systems: reconstructing the life history of Cribrilina annulata (Bryozoa) on two algal substrates

2019 ◽  
Vol 99 (06) ◽  
pp. 1363-1377 ◽  
Author(s):  
Uliana A. Nekliudova ◽  
Ksenia V. Shunkina ◽  
Alexey V. Grishankov ◽  
Marina A. Varfolomeeva ◽  
Andrey I. Granovitch ◽  
...  
Keyword(s):  
Life History ◽  
Dynamic Systems ◽  
Red Algae ◽  
Life Histories ◽  
Reproductive Period ◽  
Substrate Type ◽  
Functional Dynamics ◽  
History Of ◽  
The Common ◽  
Different Levels

AbstractQuantifying interconnected performances of the modules in a colonial organism (feeding, sexual reproduction, rejuvenation, dormancy) into an integral picture enables studying functional dynamics and resource allocation at different levels – from module to population. Testing this approach on the common boreal-Arctic bryozoan Cribrilina annulata in the White Sea, we describe its life history, comparing colonies on two algal substrates with contrasting size and lifespan. Colonies living on kelps were much larger and had a higher proportion of dormant zooids, whereas the percentage of reproducing, feeding and rejuvenating zooids was higher in colonies on red algae (with the colonies also exhibiting longer reproductive period). Colony lifespan was dependent both on substrate type and on time of colony establishment, lasting from 4–5 to up to 17 months on kelps and 14–18 months on red algae. During the reproductive season (May–September) the C. annulata population consisted of colonies of three cohorts on both substrata: overwintered and two summer generations that behaved differently. Whereas overwintered and summer colonies established in June–early August produced larvae, most of the colonies established after mid-summer were preparing for hibernation and postponed reproduction until next spring. Moreover, young reproducing colonies formed brooding hermaphrodite zooids of ordinary size, whereas overwintered colonies budded smaller-sized basal and frontal (dwarf) hermaphrodites. Finally, overall zooidal performance in co-existing colonies of the overwintered and young generations was different on kelps, but similar on red algae. Altogether our findings indicate that the life histories of colonial epibionts are much more complex and evolutionarily flexible than generally acknowledged.

Observations on the nematode Mermis nigrescens and related species

Parasitology ◽  
1944 ◽  
Vol 36 (1-2) ◽  
pp. 122-132 ◽  
Author(s):  
H. A. Baylis
Keyword(s):  
Life History ◽  
New Species ◽  
Experimental Infection ◽  
Related Species ◽  
Egg Laying ◽  
Feeding Experiments ◽  
Two New Species ◽  
History Of ◽  
Important Host ◽  
The Common

The main features of the life-history of Mermis nigrescens, so far as it is known, are briefly discussed. Some data have been collected on its distribution in the British Isles, and on the seasonal appearance of the egg-laying females. The insect hosts of the worm are discussed, and feeding experiments on various invertebrates are recorded, including the experimental infection of the common earwig (Forflctila auricularia). This insect, which has also been found naturally infested, is regarded as an important host for the species, more especially where grasshoppers are absent. Observations by other workers on the influence of the number of larvae per host on the sex of the developing worms, and on the survival of the host, have been confirmed. Two new species, closely related to M. nigrescens, are described: M. kenyensis and M. tahitiensis, from Africa and Tahiti respectively.

Life-histories and Habits of the Clover Mite, Bryobia praetiosa Koch, and the Brown Mite, B. arborea M. & A., in British Columbia (Acarina: Tetranychidae)

1958 ◽  
Vol 90 (1) ◽  
pp. 23-42 ◽  
Author(s):  
N. H. Anderson ◽  
C. V. G. Morgan
Keyword(s):  
British Columbia ◽  
Life History ◽  
Host Plant ◽  
Related Species ◽  
Life Histories ◽  
Morphological Characters ◽  
Morphological Evidence ◽  
Ecological Data ◽  
Closely Related Species ◽  
Host Plant Specificity

Bryobia praetiosa Koch (1836) was formerly regarded as a complex of closely related species or races similar in morphological characters but varying widely in life-history, host plant specificity, and habits. The authors (30) have recently shown that two species, the clover mite, B. praetiosa Koch, and the brown mite, B. arborea Morgan and Anderson, can be distinguished in British Columbia on the basis of morphological characters. This paper presents ecological data in support of the morphological evidence.

A Method of Rearing Bark- and Cambium-Feeding Beetles with particular Reference to Hylobius warreni Wood (Coleoptera: Curculionidae)

1958 ◽  
Vol 90 (7) ◽  
pp. 425-428 ◽  
Author(s):  
G. L. Warren
Keyword(s):  
Life History ◽  
Root System ◽  
Related Species ◽  
Jack Pine ◽  
Closely Related Species ◽  
Inner Bark ◽  
History Of ◽  
Biological Differences

Hylobius warreni Wood is a recently described weevil that was originally confused with Hypomolyx piceus (DeGeer, 1957). The larvae attack the inner bark and cambium of the root system of jack pine, Pinus bankisiana Lamb., and other conifers (Warren, 1956). The life history of this insect is being studied to determine biological differences between it and a closely related species, Hylobius pinicola (Couper). This information is also essential in order to continue detailed studies on the effect of site and other factors on the abundance of H. warreni (Warren, 1956a). The first requirement for fulfilling these objectives is the development of a satisfactory rearing technique.

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