scholarly journals Characterization of the larval stages of Alphitobius diaperinus (Panzer) (Coleoptera: Tenebrionidae) using head capsule width

2001 ◽  
Vol 61 (1) ◽  
pp. 125-131 ◽  
Author(s):  
O. FRANCISCO ◽  
A. P. do PRADO
Keyword(s):  
Age Structure ◽  
Developmental Rate ◽  
Head Capsule ◽  
Larval Instars ◽  
Alphitobius Diaperinus ◽  
Larval Stages ◽  
Mean Width ◽  
The Mean ◽  
Coleoptera Tenebrionidae

The mean width (n = 5) of the cephalic capsule instar of Alphitobius diaperinus was determined. The larvae were reared at 27ºC (± 0.1ºC). The result showed that A. diaperinus has eight larval instars. The head capsule of the 1st instar larvae measured x = 0.228 (SD = 0.0192) and the last instar larval measured x = 1.339 (SD = 0.0436). The developmental rate, determined by Dyar-Hutchinson's rule, was 1.29. These data may be useful for studies on phenology and age structure of A. diaperinus in the field.

THE LIFE CYCLE OF CORTICEUS GLABER (COLEOPTERA: TENEBRIONIDAE), A. FACULTATIVE PREDATOR OF THE SOUTHERN PINE BEETLE, DENDROCTONUS FRONTALIS (COLEOPTERA: SCOLYTIDAE)

1982 ◽  
Vol 114 (6) ◽  
pp. 535-537 ◽  
Author(s):  
Michael T. Smith ◽  
Richard A. Goyer
Keyword(s):  
Life Cycle ◽  
Head Capsule ◽  
Developmental Time ◽  
Dendroctonus Frontalis ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Mature Larva ◽  
Larval Instars ◽  
Pine Beetle ◽  
Coleoptera Tenebrionidae

AbstractThe life cycle of Corticeus glaber (LeConte) was investigated at 25 °C and 60% R.H. The developmental time from egg to adult for C. glaber ranged from 30 to 41 days and five larval instars were determined from head capsule measurements. The mature larva is described.

scholarly journals Morphology of immature stages of Helophorus (Gephelophorus) auriculatus (Coleoptera, Helophoridae)

2020 ◽  
Vol 60 (1) ◽  
pp. 319-332 ◽  
Author(s):  
Yusuke N. Minoshima ◽  
Reiya Watanabe
Keyword(s):  
Head Capsule ◽  
Immature Stages ◽  
Taxonomic Character ◽  
Larval Instars ◽  
Larval Stages ◽  
First Instar ◽  
Egg Case ◽  
Morphological Transformations

The morphology of immature stages of Helophorus (Gephelophorus) auriculatus Sharp, 1884 is described. This is the first description of the larva and pupa of the subgenus Gephelophorus Sharp, 1915. We describe the morphology of the egg-case, all larval stages (first to third instar, including chaetotaxy of the head) and pupa. Morphological transformations between larval instars were examined. Head chaetotaxy was nearly identical between instars. Ventral teeth on the nasale, considered as a useful taxonomic character, were absent in the first instar but well developed in later instars. Chaetotaxy differed among the subgenera Gephelophorus, Helophorus and Lihelophorus in the length and shape of setae on head capsule and maxilla. Pupal morphology was similar to that of previously described pupae: H. (Helophorus) aquaticus (Linnaeus, 1758) and H. (Rhopalohelophorus) orientalis Motschulsky, 1860. A key to families of the Hydrophiloidea of Japan based on larval characters is provided.

Determination of Larval Instars of Semanotus bifasciatus (Coleoptera: Cerambycidae) Based on Frequency Distributions of Morphological Variables

2020 ◽  
Vol 55 (3) ◽  
pp. 405-415
Author(s):  
Na Li ◽  
Lei Wu ◽  
Yongxin Geng ◽  
Danfeng Wei ◽  
Min Chen
Keyword(s):  
Body Length ◽  
Larval Instar ◽  
Head Capsule ◽  
Larval Instars ◽  
Frequency Distributions ◽  
Larval Stages ◽  
Field Investigations ◽  
Mandible Length ◽  
Morphological Variables

Abstract Semanotus bifasciatus Motschulsky (Coleoptera: Cerambycidae) is one of the most destructive pests of Platycladus trees in China. Morphological measurements, such as head capsule (HC) width, can be very useful and practical indicators for identifying larval instars of coleopteran species. In this study, six morphological variables, including HC width, pronotum width, mandible length and width, and body length and width were measured to determine the instars of field-collected larvae of S. bifasciatus. Both the HC width and pronotum width were reliable parameters for determining the instar and stage. Larvae of S. bifasciatus were divided into eight instars; we detected strong relationships between larval instar and both the HC width (R2 = 0.9640) and pronotum width (R2 = 0.9549). The ranges of body widths and lengths for each instar are provided as reference values for distinguishing among larval stages in field investigations.

scholarly journals Development and determination of larval stages of fall armyworm on some staple crops

1970 ◽  
Vol 29 (4) ◽  
pp. 445-457
Author(s):  
O.O. Odeyemi ◽  
O.T. Alamu ◽  
G.A. Yekinni ◽  
Q.O. Oloyede-Kamiyo
Keyword(s):  
Larval Development ◽  
Fall Armyworm ◽  
Head Capsule ◽  
Sub Saharan Africa ◽  
Pupal Weight ◽  
Alternative Host ◽  
Growth Ratio ◽  
Larval Instars ◽  
Head Capsule Width ◽  
Mean Width

Fall armyworm (FAW), Spodoptera frugiperda Smith (Lepidoptera: Noctuidae), is a serious emerging pest of maize (Zea mays L.) and many other alternative crop hosts in sub-Saharan Africa. Adequate knowledge on the development of S. frugiperda on maize and other alternative host crops is important in the development of integrated pest management programmes. The objective of this study was to determine the larval developmental stages of FAW using head capsule and other body morphometrics of FAW on maize and other alternative host crops in Nigeria. Food hosts (maize, cassava and cowpea) were replicated five times and arranged in a Completely Randomised Design. The results showed that mean growth ratio of larval development on maize, cassava and cowpea were 1.51, 1.54 and 1.50, respectively; and all conformed to Dyar’s rule. Head capsule width of larval instars showed six frequency peaks, representing six larval instars. Mean width of head capsule from the first to sixth larval, in the three crops, were significantly different. The shortest (14 days) and longest (17 days) developmental periods were recorded on maize and cassava. Pupal weight and length were not significantly different among the crops. There was a linear and significant correlation (maize = 0.98, cassava = 0.98 and cowpea = 0.99) between the stages of larval development and head capsule width. The number of larval instars of FAW, duration of their developments and the weights of larva and pupa on maize, cassava and cowpea are useful information in determining the number of generations of FAW on each crop. This information could, therefore, be applied in decision making on the appropriate time and duration of application of control actions when these crops are infested.

scholarly journals Enumeration and Random Generation of Concurrent Computations

2012 ◽  
Vol DMTCS Proceedings vol. AQ,... (Proceedings) ◽  
Author(s):  
Olivier Bodini ◽  
Antoine Genitrini ◽  
Frédéric Peschanski
Keyword(s):  
Linear Time ◽  
Time Algorithm ◽  
Random Generation ◽  
Worst Case ◽  
Analytic Combinatorics ◽  
Mean Width ◽  
Concurrent Processes ◽  
International Audience ◽  
The Mean

International audience In this paper, we study the shuffle operator on concurrent processes (represented as trees) using analytic combinatorics tools. As a first result, we show that the mean width of shuffle trees is exponentially smaller than the worst case upper-bound. We also study the expected size (in total number of nodes) of shuffle trees. We notice, rather unexpectedly, that only a small ratio of all nodes do not belong to the last two levels. We also provide a precise characterization of what ``exponential growth'' means in the case of the shuffle on trees. Two practical outcomes of our quantitative study are presented: (1) a linear-time algorithm to compute the probability of a concurrent run prefix, and (2) an efficient algorithm for uniform random generation of concurrent runs.

DIET, TEMPERATURE, AND THE LOGISTIC MODEL OF DEVELOPMENTAL RATE FOR TRIBOLIUM CONFUSUM (COLEOPTERA: TENEBRIONIDAE)

1981 ◽  
Vol 113 (9) ◽  
pp. 813-818 ◽  
Author(s):  
R. J. Lamb ◽  
S. R. Loschiavo
Keyword(s):  
Environmental Factors ◽  
Logistic Model ◽  
Developmental Rate ◽  
Logistic Equation ◽  
Tribolium Confusum ◽  
Lysine Content ◽  
Developmental Rates ◽  
The Mean ◽  
The Relationship ◽  
Coleoptera Tenebrionidae

AbstractThe developmental rates of individual larvae of Tribolium confusum Jacquelin duVal were measured at five temperatures on three diets to quantify the interaction between these two environmental factors. No significant differences in survival were detected but developmental times were affected by both factors. A logistic equation accurately described the relationship between mean developmental rate and temperature for each diet. The variance in developmental rate was a linear function of the mean developmental rate, and the mean accounted for more of the differences in variance than diet or temperature.The effect of diet was greatest at the temperature which caused the highest developmental rate. It decreased as temperature decreased. This effect could be accounted for by varying the coefficient K, the asymptote of the logistic equation. The coefficient K showed a positive linear relationship to the lysine content of the diet. This coefficient may provide a compact and quantitative means of summarizing the interaction of environmental factors such as diet and temperature in the logistic model for the developmental rate of insects.

scholarly journals Development of Myrmeleon brasiliensis (Navás) (Neuroptera, Myrmeleontidae), in laboratory, with different natural diets

2006 ◽  
Vol 23 (4) ◽  
pp. 1044-1050 ◽  
Author(s):  
Giani L. B. Missirian ◽  
Manoel A. Uchôa-Fernandes ◽  
Erich Fischer
Keyword(s):  
Ceratitis Capitata ◽  
Pupal Stage ◽  
Fruit Fly ◽  
Head Capsule ◽  
Natural Environments ◽  
Mean Width ◽  
Leaf Cutting ◽  
The Mean ◽  
Fly Larvae ◽  
Sand Pits

Antlions larvae are sit-and-wait predators that capture arthropod prey in conical sand pits. The aim of this paper were to determine the effect of different natural diets [leaf-cutting ants (Atta spp.), fruit fly larvae (Anastrepha spp. and Ceratitis capitata) and mixed diet (Atta spp. plus fruit fly larvae)] on the development of larvae and pupae of M. brasiliensis (Navás, 1914) and to estimate the number and size of prey caught in each instar and on each kind of diet. The average duration (days) of the second and third instars of M. brasiliensis was longer when larvae of antlion were fed with leaf-cutting ants. The diets did not affect the duration of the pupal stage nor the pupae size. The different diets did not affect the mean width of head capsule (mm), the mean weight (mg) or the mean body size (mm) in the different instars of M. brasiliensis. In the second and third instars, the larvae of M. brasiliensis fed with leaf-cutting ants consumed more prey than larvae kept on other diets. Adults whose larvae were fed fruit fly larvae were larger than adults on other diets. Although Myrmeleontidae are few studied in Brazil, these results contribute to knowledge of M. brasiliensis biology, but also suggest the need of studies about the development of larvae and pupae in natural environments.

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