Life history and biology of the riffle bug Rhagovelia obesa Uhler (Heteroptera: Veliidae) in Southern Ontario

1971 ◽  
Vol 49 (4) ◽  
pp. 435-442 ◽  
Author(s):  
Lanna Cheng ◽  
C. H. Fernando
Keyword(s):  
Life History ◽  
Egg Laying ◽  
Unusual Feature ◽  
Southern Ontario ◽  
Worldwide Distribution ◽  
First Instar ◽  
History Of ◽  
First Time ◽  
Life History Study

The life history of Rhagovelia obesa (Heteroptera: Veliidae) was investigated using field collected and laboratory reared material. The nymphal instars and adults are described and figured. This is the first life-history study of Rhagovelia or its related genera Tetraripis and Trochopus. These genera together have almost a worldwide distribution and are characterized by a unique swimming plume beating underwater. Four nymphal instars occur instead of the usual five. The overwintering stage is the egg, another unusual feature for aquatic Hemiptera. The site(s) of egg laying have not been located. For the first time Rhagovelia has been raised in the laboratory from first instar to adult.

scholarly journals Life History of Oxybelus variegatus Wesmael, 1852 (Hymenoptera: Crabronidae) with a Description of the Mature Larva

Insects ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 100
Author(s):  
Piotr Olszewski ◽  
Petr Bogusch ◽  
Krzysztof Szpila
Keyword(s):  
Life History ◽  
Mature Larva ◽  
Digger Wasp ◽  
Comprehensive Information ◽  
History Of ◽  
First Time ◽  
Delia Platura

The first comprehensive information on the bionomics of the digger wasp Oxybelus variegatus Wesmael, 1852 is presented. Females nested in small aggregations in crevices between paving stones of a frequently used pedestrian pathway in lowland agricultural wasteland. Nests were dug in the ground using mandibles, legs and abdomen. The nest consists of a main burrow with one or, rarely, two cells. The mature larva is described for the first time. The egg stage lasts for about two days before the larva hatches. The female provisioned each cell with an average of 11 paralysed male flies of Delia platura (Meigen, 1826) (Diptera: Anthomyiidae). Numerous females of dipteran kleptoparasites were observed in the nesting area of O. variegatus. However, only a few nests were infested by larvae of Senotainia conica (Fallen, 1810).

The life histories of north-temperate populations of the crayfish Cambarus robustus and Cambarus bartoni

1985 ◽  
Vol 63 (10) ◽  
pp. 2313-2322 ◽  
Author(s):  
Premysl Hamr ◽  
Michael Berrill
Keyword(s):  
Life History ◽  
Life Histories ◽  
Carapace Length ◽  
Late Summer ◽  
Temperate Climate ◽  
Free Living ◽  
Southern Ontario ◽  
The Third ◽  
Early Fall ◽  
First Time

The life histories of the crayfish Cambarus robustus and Cambarus bartoni were studied in the Kawartha Lakes region of southern Ontario. There were marked differences in their breeding and molting cycles compared with the familiar pattern of the Orconectes species of this region. Egg extrusion occurred later (July in C. robustus, June in C. bartoni), and juveniles therefore did not become free living until late summer or early fall. With little growing time in their first summer, they measured only 5–10 mm in carapace length (CPL) before growth ceased for the winter. At the end of their second summer the still immature crayfish measured 17–26 mm CPL in C. robustus and 13–20 mm CPL in C. bartoni. Maturity was therefore not attained until the end of the third summer, when most C. robustus matured at 34–45 mm CPL and C. bartoni at 25–30 mm CPL. The majority of individuals apparently reproduced for the first time during their fourth summer; a few apparently survived into another summer, reaching carapace lengths greater than 50 mm in C. robustus and 30 mm in C. bartoni. In males of both species, form 1 and form 2 occur throughout the summer. Although lacking the synchrony of Orconectes species, breeding and molting activities are still confined to the period between April and October. The timing of the life-history events observed in these two Cambarus species may be adaptations to seasonal stresses of the swift water environments that these species inhabit as well as to the relative harshness of the northern temperate climate.

Description of the pupa and observations on the distribution, ecology, and life history of Quedius spelaeus spelaeus Horn (Coleoptera: Staphylinidae) in Nova Scotia, Canada

Zootaxa ◽  
2006 ◽  
Vol 1226 (1) ◽  
pp. 61 ◽  
Author(s):  
MAX MOSELEY ◽  
JAN KLIMASZEWSKI ◽  
CHRISTOPHER G. MAJKA
Keyword(s):  
Life History ◽  
Nova Scotia ◽  
Glacial Refugia ◽  
Disjunct Distribution ◽  
Late Instar ◽  
History Of ◽  
First Time

The troglophilic staphylinid beetle Quedius spelaeus spelaeus Horn 1871, has been found in a number of porcupine dung caves in Nova Scotia where it appears to be the dominant predator on other invertebrates. In culture, late-instar larvae were observed to excavate and remain in cavities excavated in dung, and to pupate in these cavities. The pupa is described for the first time and compared with other pupae in the genus Quedius Stephens. The apparently disjunct distribution of the species in Nova Scotia is discussed and it is suggested that it may have colonized the province from Atlantic glacial refugia.

scholarly journals NOTES ON THE LIFE-HISTORY OF AGALLIA SANGUINOLENTA, Prov.

1892 ◽  
Vol 24 (2) ◽  
pp. 35-36
Author(s):  
Herbert Osborn ◽  
H. A. Gossard
Keyword(s):  
Life History ◽  
Egg Laying ◽  
Food Plant ◽  
Stages Of Growth ◽  
Leaf Hopper ◽  
History Of

This leaf-hopper is considered a clover pest, but is also known to feed on beets, rutabagas, cabbages and blue grass. It is active even in midwinter on sunshiny days. The eggs are thrust beneath the epidermis of the food-plant, and the first brood of larvæ appears from the middle of May until July 1st. The earliest individuals of the brood are nearly mature by the first of July and are supposed to begin egg-laying a little later. Larvæ can be found in all stages of growth from this time until the advent of winter, but most of the individuals are believed to be included in two broods.

The Life History of Aptesis basizona (Grav.) on Neodiprion sertifer (Geoff.) in Southern Ontario

1961 ◽  
Vol 93 (11) ◽  
pp. 1005-1010 ◽  
Author(s):  
K. J. Griffiths
Keyword(s):  
Life History ◽  
Neodiprion Sertifer ◽  
Northern Europe ◽  
Southern Ontario ◽  
History Of

Aptesis biasizona (Grav.) is a common and widely distributed parasite of diprionid sawflies in central, western, and northern Europe, with parasitism varying from three to 90 per cent on different hosts and in different areas. One of these sawflies, Neodiprion sertifer (Geoff.), is very commonly attacked, with parasitism of 30 to 80 per cent in Czechoslovakia, 10 to 52 per cent in Hungary, and 17.5 to 40 per cent in Sweden (Morris et al., 1937).

scholarly journals Breastfeeding during adolescence: life history of first-time mothers

2014 ◽  
Vol 6 (1) ◽  
pp. 414-424
Author(s):  
Thelma Spindola ◽  
Adriana Oliveira ◽  
Renata Cavalcanti ◽  
Vinícius Fonte
Keyword(s):  
Life History ◽  
First Time Mothers ◽  
History Of ◽  
First Time

THE BIOLOGY OF PODISUS SERIEVENTRIS UHLER, IN CAPE BRETON, NOVA SCOTIA

1933 ◽  
Vol 9 (1) ◽  
pp. 1-30 ◽  
Author(s):  
M. L. Prebble
Keyword(s):  
Life History ◽  
Control Factor ◽  
Plant Food ◽  
Average Growth ◽  
Growth Ratio ◽  
Animal Food ◽  
Cape Breton ◽  
First Instar ◽  
History Of ◽  
June July

The biology of Podisus serieventris Uhler, and its role in an outbreak of the black-headed budworm, Peronea variana Fernald, in Cape Breton, N.S., are described from studies carried on in 1930 and 1931. There is but one complete generation of Podisus a year, and adults of both sexes hibernate. The eggs are laid in late June, July and early August, the incubation period ranging between 10 and 15 days. There are five nymphal stages, requiring about 45 days, on the average, for the attainment of the adult condition. In these respects particularly, the life history of Podisus serieventris in Cape Breton differs from its life history in Massachusetts, where four nymphal stages and three annual generations and the hibernation of females only, have been reported.The species conforms satisfactorily to Dyar's Law, the average growth ratio of individuals studied in 1931 being about 1.28. The first-stage nymphs feed on unhatched eggs of their own species, and upon the juices of coniferous and deciduous foliage, but were not induced to feed upon small caterpillars. Nymphs were able to complete the first instar on a purely vegetable diet, but died before the second moult when the same diet was continued. Older nymphs, fed for some time on animal food, were not able to attain the adult condition when supplied with plant food alone. This indicates the dependence of the species upon animal food; the food consumption of the various stages is briefly summarized. Evidence is presented which suggests the utilization, by Podisus, of a toxic secretion in overcoming their prey.The rather limited value of Podisus as a control factor in the outbreak of Peronea variana in 1930 and 1931 is described. The decline of the Peronea population in 1931 caused a corresponding mortality in the Podisus population, by starvation.

A Skipper, Thymelicus lineola (Ochs.) (Lepidoptera: Hesperiidae) and its Parasites in Ontario

1962 ◽  
Vol 94 (10) ◽  
pp. 1082-1089 ◽  
Author(s):  
A. P. Arthur
Keyword(s):  
North America ◽  
Present Author ◽  
The West ◽  
West Side ◽  
Southern Ontario ◽  
First Report ◽  
History Of ◽  
Lake Simcoe ◽  
First Time ◽  
Extensive Damage

The European, or Essex skipper, Thymelicus (= Adopaea) lineola (Ochs.), was accidentally introduced into North America at London, Ontario, sometime before 1910 (Saunders, 1916). The history of its subsequent spread through southern Ontario and adjoining parts of Michigan and Ohio was reviewed by Pengelly (1961), who received the first report of extensive damage to hay and pasture crops by this insect in Ontario from the Markdale area of Grey County in 1956. A survey in 1958 (Pengelly, 1961) showed that the skipper “appeared to be present throughout the southern part of the province except for the Bruce peninsula and possibly the Windsor area. The northeasterly boundary appeared to he along a line from Midland, south around the west side of Lake Simcoe, east to Lindsay and south to Whitby.” The present author collected T. lineola larvae from the Belleville area for the first time in 1959.

Researches on the Intestinal Protozoa of Monkeys and Man. I. General Introduction, and II. Description of the whole Life-History of Entamoeba histolytica in Cultures

Parasitology ◽  
1928 ◽  
Vol 20 (4) ◽  
pp. 357-412 ◽  
Author(s):  
Clifford Dobell
Keyword(s):  
Life History ◽  
Entamoeba Histolytica ◽  
Continuous Cultivation ◽  
Intestinal Protozoa ◽  
Natural Hosts ◽  
History Of ◽  
New Generation ◽  
First Time ◽  
At Will

A pure strain of Entamoeba histolytica has been isolated and cultivated, and an attempt has been made to study and describe its whole life-history in detail.This strain (K. 28 c) was derived from the dysenteric dejecta of a kitten experimentally infected per os by means of typical cysts from the faeces of a monkey (Macacus sinicus). It has now been under continuous cultivation for about 20 months (220 serial subcultures), and its development in vitro has been uniform throughout.Methods have been devised, and are here described, whereby any desired stage in the life-history of this strain—amoebae, cysts, and all intermediate stages (including encystation and excystation)—can be readily procured in vitro at will.Detailed study has shown that the trophic amoebae multiply in cultures by simple binary fission only, as they do in their natural hosts. Their mode of division is briefly described.Encystation also occurs in vitro just as it does in the bowel, with formation of characteristic precystic amoebae and the final production of typical quadrinucleate cysts.Excystation has been carefully studied, and it has been found that a single quadrinucleate, amoeba escapes from each cyst through a minute perforation in its wall. An account is given of this remarkable process, which has not been described previously.The 4-nucleate excysted (metacystic) amoeba has been found to produce a new generation of trophic forms by a complicated series of nuclear and cytoplasmic divisions, which are described in detail for the first time. The final result of this subdivision is the production of eight uninucleate amoebulae by each quadrinucleate amoeba hatched from a cyst.These amoebulae are young trophic amoebae, and not gametes or conjugants. No sexual phenomena of any sort have been observed during the metacystic itages: and the life-history of E. histolytica, as visible in vitro, is thus wholly sexual.A development similar to that here described in the case of Strain K. 28 c has been found to occur in many other cultivated strains of E. histolytica— including a strain isolated directly from man, and a human strain experiaentally implanted in a monkey (M. sinicus) and recovered therefrom in pure culture. There are therefore good reasons for concluding that the development were described is not abnormal, and that it is probably closely parallel to that which occurs naturally inside man.

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