The Euphausiidæ in the Neighbourhood of Plymouth. II. Nyctiphanes Couchii and Meganyctiphanes noruegica.

1925 ◽  
Vol 13 (4) ◽  
pp. 810-847 ◽  
Author(s):  
Marie V. Lebour
Keyword(s):  
Life History ◽  
Remaining Life ◽  
Larval Stages ◽  
History Of ◽  
Meganyctiphanes Norvegica

The present paper is a continuation of last year's work on the Euphausiidæ in the neighbourhood of Plymouth (Lebour, 1924), in which the early larval stages were described of Nyctiphanes Couchii, Meganyctiphanes norvegica and, less fully, those of Thysanoessa inermis and T. neglecta. These two last-named forms are reserved for a detailed description in another paper, only Nyctiphanes and Meganyctiphanes being dealt with here. The first paper described these as far as the last Calyptopis stages, and it was shown that they were much alike although perfectly distinct, especially as regards colour. The nauplii and metanauplii were easily distinguishable. The whole of the remaining life-history of Nyctiphanes Couchii has now been elucidated and also that of Meganyctiphanes norvegica, with the exception of a few late larval stages. The absence of these, however, does not materially affect our knowledge of its life-history.

scholarly journals The biology of Limacina retroversa

1954 ◽  
Vol 33 (2) ◽  
pp. 297-312 ◽  
Author(s):  
J. E. Morton
Keyword(s):  
Life History ◽  
Breeding Season ◽  
Detailed Account ◽  
Larval Stages ◽  
Large Numbers ◽  
History Of ◽  
Clione Limacina

The Plymouth Fauna List contains records of two genera of pteropods, Limacina and Clione. Of the first, Limacina retroversa (Flem.) is by far the better-known species, apparently occurring regularly at Plymouth in large numbers in townettings from outside, and sometimes inside, the Sound. It breeds at Plymouth from June to August, and Lebour (1932) has given a detailed account of its breeding and larval stages and has discussed its role in the plankton. The second species of Limacina at Plymouth is lesueuri (d'Orbigny), which has been observed from time to time since 1906, when it was very common. The last record in the Fauna is off the Breakwater in 1920. Of the gymnosomatous pteropods, Clione limacina Phipps is the only species regularly occurring. Lebour (1931) has described the life history of this form, and mentions February to August as its months of greatest abundance. Its breeding season is June to August. Another gymnosome, tentatively referred to as Clionina longicauda, is reported by Russell (1936), and from the specimen department at Plymouth Laboratory the writer obtained some preserved specimens, not easily identifiable, of a Pneumodermopsis taken locally; its species is perhaps ciliata, recorded by Massy (1917) from the Irish Coast.

The larval stages of the Nematode Mermis nigrescens

Parasitology ◽  
1947 ◽  
Vol 38 (1-2) ◽  
pp. 10-16 ◽  
Author(s):  
H. A. Baylis
Keyword(s):  
Life History ◽  
Larval Development ◽  
Forficula Auricularia ◽  
Larval Stages ◽  
History Of

In a former paper (Baylis, 1944) an account was given of some observations on the life-history of Mermis nigrescens, and of its occurrence, naturally and experimentally, in earwigs (Forficula auricularia). As stated in that paper, the material then available did not seem to warrant an attempt to describe the larval development. Further material has now been obtained and studied, and it seems desirable to place on record some of the observations made, although many points still remain obscure.

The life-history and control of Hapatesus hirtus Candeze (Coleoptera: Elateridae) in Victoria

1991 ◽  
Vol 42 (5) ◽  
pp. 827 ◽  
Author(s):  
PA Horne ◽  
JA Horne
Keyword(s):  
Life History ◽  
Field Trials ◽  
Soil Samples ◽  
Control Measures ◽  
Potato Tubers ◽  
Larval Stages ◽  
Complete Development ◽  
History Of ◽  
And Control ◽  
Potato Crops

The incidence and life-history of potato wireworm, Hapatesus hirtus Candeze, in Victorian potato crops were studied, and insecticidal control measures assessed. Larval stages were present and active throughout the year. Ten larval instars were identified, probably requiring several years to complete development. Egg development occurred in October-November and the most likely timing of oviposition was December. The relative numbers of larval H. hirtus detected in soil samples, pre-planting baits and harvested tubers are presented. Baiting with halves of potatoes provided an efficient means of detecting areas likely to suffer wireworm damage. One formulation of chlorpyrifos ('Lorsban') was effective in reducing damage to, and larval numbers in, potatoes in field trials. The granular formulation of tefluthrin and the controlled release chlorpyrifos were not effective in protecting potato tubers.

On the life history of Synthesiomyia nudiseta van der Wulp (Diptera, Muscidae), a myiasis-producing fly

Parasitology ◽  
1942 ◽  
Vol 34 (3-4) ◽  
pp. 239-245 ◽  
Author(s):  
L. B. Siddons ◽  
D. N. Roy
Keyword(s):  
Life History ◽  
Present Communication ◽  
Interesting Fact ◽  
Larval Stages ◽  
Early Stages ◽  
History Of

Townsend (1935) has described the egg of Synthesiomyia nudiseta and recorded the interesting fact that the larva forms a cocoon. The larval stages and the puparium do not appear to have been described. That this species was not among the larvae of some unknown muscids described by Banks (1912) is evident from the figures of the-posterior spiracles. The present communication provides an account of all the early stages.

scholarly journals ADDITIONAL NOTES ON THE LIFE-HISTORY OF ARCTIA PHALERATA, HARR

1902 ◽  
Vol 34 (2) ◽  
pp. 50-51
Author(s):  
Arthur Gibson
Keyword(s):  
Life History ◽  
Stage Iv ◽  
The Body ◽  
Lateral Band ◽  
Larval Stages ◽  
The Past ◽  
History Of ◽  
Dorsal Stripe ◽  
Past Summer

In the December number, 1900, of this journal, page 369, the writer published the life-history of the above Arctian. During the past summer, through the kindness of Mr. A. Kwiat, of Chicago, in forwarding eggs of A. phalerata (laid 18th June), I have had the opportunity of still further studying this species, and, as these larvæ varied considerably fromthose described in 1900, the following notes were made :In the larval stages i, ii and iii those bred in 1901 answered well to my former descriptions. In stage iv the larvæ were not so black as the specimens reared the previous year, but many of them showed the dorsal stripe. This stripe was also present in stage v, besides which 40 of the larvæ possessed a series of pale orange spots on sides between tubercles ii and iii, and iii and iv, and the skin of the body in a line with the upper spots(between tubercles ii and iii) was slightly grayish, not black like the rest of the skin; this and the spots gave the appearance of a faint lateral band, distinguishable on all segments but 2 and 13. In stage v in 1900 none of the larvæ showed the dorsal stripe.

Aspects of the life history of Meganyctiphanes norvegica (M. Sars), Crustacea (Euphausiacea), in Passamaquoddy Bay

1974 ◽  
Vol 52 (4) ◽  
pp. 495-505 ◽  
Author(s):  
K. W. Hollingshead ◽  
S. Corey
Keyword(s):  
Life History ◽  
Life Span ◽  
Sexual Maturity ◽  
Gonadal Development ◽  
Age Group ◽  
Group I ◽  
Passamaquoddy Bay ◽  
History Of ◽  
Meganyctiphanes Norvegica ◽  
First Time

Monthly collections of Meganyctiphanes norvegica for a 19-monih period in Passamaquoddy Bay showed that these euphausiids were present in the bay in varying numbers from February to November but virtually disappeared in December and January. Sexual maturity is attained in 1 year with gonadal development taking 3 months, and spawning occurring in July and August. The resulting generation will breed and spawn for the first time the next July as age group I. Age group I grows from April until August; from September until March, very little growth occurs. After a second breeding and spawning, the animals die, having a life span of 2 years.

A study of the Eugregarines of the grass-grub [larva of Costelytra zealandica (White), Melolonthinae], with a description of three new species

Parasitology ◽  
1969 ◽  
Vol 59 (3) ◽  
pp. 663-682 ◽  
Author(s):  
F. R. Allison
Keyword(s):  
Life History ◽  
New Species ◽  
Life Cycle ◽  
Malpighian Tubules ◽  
Size Group ◽  
Large Species ◽  
Larval Stages ◽  
Costelytra Zealandica ◽  
History Of ◽  
Three New Species

1. Three new species of eugregarine are described from the mid-gut of the larva of Costelytra zealandica (White).2. Euspora zealandica occurs in the anterior region of the mid-gut near the gut caeca. Slictospora costelytrae occurs just posteriorly to E. zealandica. Euspora sp. occurs posteriorly to the malpighian tubules, but was found only rarely.3. A description of the species and the life-cycle of two species are given.4. The life-cycle of S. costelytrae takes about 8 weeks and that of E. zealandica 6 weeks.5. Gametocysts will develop only at a humidity of 95–100 %.6. The bi-associative species, E. zealandica, is more abundant in the 1st and 2nd instars than the large species, S. costelytrae. Both species are equally abundant in the 3rd instars, but the peak for incidence was in May for E. zealandica and June for S. costelytrae. This is related to the longer period of time taken for the life-history of S. costelytrae.7. The incidence of gregarines builds up in each instar to over 90% then falls off, the time of fall off corresponding with the production of gametocysts which pass out with the faeces of the grub.8. The gregarines mostly complete their cycle before the instars moult. This is borne out by the observation that cysts were not found in the smallest size group of each instar. There were many cases in the larger size group of all three instars where cysts only occurred.9. Gametocysts are produced mainly in the autumn.10. Gregarines were not found in grubs approaching metamorphosis (prepupae) nor in pupae nor adults.11. It seems unlikely from the results that the gregarines have an adverse effect on the grubs as, in general, it was found that the larger grubs had the greater number of gregarines present, but further work on this is needed.12. The life-history of the gregarines is closely correlated with the life-history of the beetle.13. The presence of the gregarines only in the larval stages is related to the different habitat and behaviour of larva and adult.I am grateful to the University Grants Committee for financial support.

Observations on the Life History of Ollulanus tricuspis Leuck., the Stomach Worm of the Cat

1927 ◽  
Vol 5 (2) ◽  
pp. 67-80 ◽  
Author(s):  
Thomas W. M. Cameron
Keyword(s):  
Life History ◽  
Intermediate Host ◽  
Subsequent Work ◽  
Larval Stages ◽  
History Of

Until recently, it had generally been accepted that the life history of Ollulanus tricuspis was a complicated one involving an intermediate host, the mouse. Last year, however, I drew attention to the fact that the larval stages, both in the cat and in the mouse, believed by Leuckart to belong to Ollulanus, were really those of Ælurostrongylus, the lungworm of the cat. Subsequent work has enabled some of the details of the life history of Ollulanus to be elucidated—although by no means all—and these are considered in this paper.

Some Stages in the Development of Œsophagostomum dentatum from the Pig

1926 ◽  
Vol 4 (4-5) ◽  
pp. 191-198 ◽  
Author(s):  
T. Goodey
Keyword(s):  
Life History ◽  
Buccal Capsule ◽  
Stage Larva ◽  
Infective Stage ◽  
Free Living ◽  
Larval Stages ◽  
Oesophagostomum Dentatum ◽  
General Plan ◽  
History Of

In an earlier paper (Goodey, 1924), the writer has given an account of the morphology of the adults of Œsophagostomum dentatum, the development and structure of the free-living larvæ and the biology of the ensheathed infective stage. So far, however, the parasitic larval stages have not been described. In the present paper some of the gaps in our knowledge of the complete life-history of the worm represented by these stages are filled in, not as completely as could be desired owing to the absence from the material of specimens showing the 3rd and 4th ecdyses. The worms found, however, show that the 4th stage larva has a provisional buccal capsule essentially similar to that found in 4th stage larvæ of O. radiatum (Marotel, 1908) and O. columbianum (Veglia, 1924), and in this respect is in line with certain other 4th stage larvæ of the Strongyloidea such as Ancylosloma duodenale (Looss, 1897), and Triodontophorus tenuicollis (Ortlepp, 1925), in which provisional buccal capsules built on the same general plan have been observed.

scholarly journals On some Larval Stages of Fishes

1891 ◽  
Vol 2 (1) ◽  
pp. 68-73 ◽  
Author(s):  
J. T. Cunningham
Keyword(s):  
Life History ◽  
Larval Stages ◽  
History Of ◽  
Three Stages ◽  
The Common ◽  
Common Sole

The six drawings reproduced in Plates III and IV were made at sundry times from stages that I succeeded in obtaining in the years 1889 and 1890. The three stages of the common sole were procured after my quarto book on that fish was completed, and they enable me to supplement the account of the life-history of the species given there.

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