Observations on the Effect of Exposure to a Low Temperature on Laemophloeus minutus (Ol.) (Col. Cucujidae)

1954 ◽  
Vol 45 (2) ◽  
pp. 351-359 ◽  
Author(s):  
Gwyneth C. Williams
Keyword(s):  
Low Temperature ◽  
Adult Male ◽  
Developmental Stages ◽  
Instar Larva ◽  
Fourth Instar ◽  
Fourth Instar Larva ◽  
Atmospheric Humidity ◽  
Larval Instars ◽  
Limited Period

Experiment showed that all developmental stages of Lacemophloeus minutus (Ol.) can survive exposure to a temperature of + 2°C. for a limited period which varies with the instar.The egg was more susceptible to such exposure than any other stage, followed by the first, second and third larval instars and the adult, which did not differ significantly from each other, and then by the fourth-instar larva and pupa which can also be grouped together.The adult male proved 1·21 times more susceptible than the female to the effects of exposure.Atmospheric humidity did not influence the mortality of eggs or adults. Previous starvation did not affect the mortality of adults subsequently exposed to + 2°C.

scholarly journals Biology and Predation of Stethorus punctillum Weise (Coleoptera: Coccinellidae) feeding on Tetranychus urticae Koch

1970 ◽  
Vol 15 ◽  
pp. 1-5 ◽  
Author(s):  
GC Biswas ◽  
W Islam ◽  
MM Haque
Keyword(s):  
Tetranychus Urticae ◽  
Developmental Stages ◽  
Instar Larva ◽  
Predation Rate ◽  
Fourth Instar ◽  
Fourth Instar Larva ◽  
First Instar ◽  
Different Seasons ◽  
Two Spotted Spider Mite ◽  
Stethorus Punctillum

The duration of hatching, larval instars and pupal stages of Stethorus punctillum feeding on two-spotted spider mite, Tetranychus urticae were investigated in different seasons under laboratory conditions. The highest values of different developmental stages were obtained during winter. Higher temperature significantly reduced the duration of different developmental stages. No significant effect of relative humidity was exerted on the development stages of S. punctillum. The predation rate of fourth instar larva of S. punctillum was the highest whereas the first instar larva consumed the lowest number of prey. The fourth instar larva of the predator consumed 135.8 eggs, 126.4 larvae, 96.6 nymphs and 72.8 adults per day separately. But the first instar consumed 41.6 eggs, 36.2 larvae, 26.8 nymphs and 16.8 adults during the same period. Keywords: Developmental durations, predation, Tetranychus urticae, Stethorus punctillum   doi: 10.3329/jbs.v15i0.2196 J. bio-sci. 15: 1-5, 2007

Description of the pupa and additional characters of the fourth-instar larva, female, and male genitalia of Uranotaenia (Uranotaenia) coatzacoalcos Dyar & Knab, with keys for the identification of Mexican species of Uranotaenia (Diptera: Culicidae)

Zootaxa ◽  
2019 ◽  
Vol 4608 (2) ◽  
pp. 247
Author(s):  
KARINA D. RIVERA-GARCÍA ◽  
ABRIL RÍSQUEZ-PÉREZ ◽  
SERGIO IBÁÑEZ-BERNAL
Keyword(s):  
Urban Areas ◽  
Male Genitalia ◽  
Developmental Stages ◽  
Pupal Stage ◽  
Instar Larva ◽  
Fourth Instar ◽  
Morphological Description ◽  
Vector Surveillance ◽  
Fourth Instar Larva ◽  
Diagnostic Characteristics

Eleven species of Uranotaenia, one belonging to the subgenus Pseudoficalbia and ten to the subgenus Uranotaenia, have been recorded in Mexico. In general, two species are commonly recorded in urban areas by the vector surveillance programs, but the other species are rarely collected as they occupy habitats in non-anthropized environments, and for that reason they remain poorly known. Some of the species recorded in Mexico have not been described in the pupal stage and other developmental stages have only been partially described, making their recognition difficult. One of these species is Uranotaenia (Uranotaenia) coatzacoalcos Dyar & Knab, as a complete description of its larval chaetotaxy is not available, and the pupa has not been described. In this report, we provide a complete morphological description of the fourth-instar larva, the first description of the pupa, and a review of the female and male diagnostic characteristics useful for recognition of the species. We also provide keys in English and Spanish for the recognition of the larvae, pupae, females, and male genitalia of the species of Uranotaenia recorded in Mexico. 

Three species of Hydrobaenus Fries (Diptera: Chironomidae: Orthocladiinae) from Belarus

Zootaxa ◽  
2018 ◽  
Vol 4394 (2) ◽  
pp. 279
Author(s):  
EUGENYI A. MAKARCHENKO ◽  
MARINA A. MAKARCHENKO
Keyword(s):  
Adult Male ◽  
Instar Larva ◽  
Fourth Instar ◽  
Fourth Instar Larva ◽  
Male Pupa

Illustrated descriptions of adult male, pupa and fourth instar larva of Hydrobaenus molleri sp. nov., adult male of H. hvoenskiensis sp. nov. and redescription of adult male H. pilipes (Malloch) with taxonomic notes are provided on the basis of materials collected from Belarus. 

Morphological description of the pupa and fourth-instar larva and redescription of the adults of Psorophora (Psorophora) pallescens Edwards (Diptera: Culicidae)

Zootaxa ◽  
2009 ◽  
Vol 2306 (1) ◽  
pp. 51-58 ◽  
Author(s):  
MARINA STEIN ◽  
MAGDALENA LAURITO ◽  
GUSTAVO CARLOS ROSSI ◽  
WALTER RICARDO ALMIRÓN
Keyword(s):  
Adult Male ◽  
Male Genitalia ◽  
Instar Larva ◽  
Fourth Instar ◽  
The Other ◽  
Morphological Description ◽  
Fourth Instar Larva ◽  
Male And Female ◽  
First Time

The adult male and female of Psorophora (Psorophora) pallescens Edwards are redescribed. The pupa and fourth-instar larva are described for the first time. The male genitalia, pupa and fourth-instar larva are illustrated. Information on distribution, bionomics and taxonomy is also included. Psorophora pallescens adults differ from the other species of the subgenus in the coloration of the scutum and abdomen. The larva can be distinguished from Psorophora ciliata based on characters of the head, thorax and abdomen.

Neotype designation and redescription of adult male and immature stages of Anopheles (Nyssorhynchus) pictipennis (Philippi) (Diptera: Culicidae)

Zootaxa ◽  
2009 ◽  
Vol 2295 (1) ◽  
pp. 15-24 ◽  
Author(s):  
CHRISTIAN R. GONZÁLEZ ◽  
MARIA ANICE MUREB SALLUM
Keyword(s):  
Adult Male ◽  
Larval Stage ◽  
Male Genitalia ◽  
Instar Larva ◽  
Sao Paulo ◽  
Fourth Instar ◽  
Immature Stages ◽  
São Paulo ◽  
Fourth Instar Larva ◽  
Diagnostic Characteristics

A neotype is designated for Anopheles (Nyssorhynchus) pictipennis (Philippi) and morphological redescriptions are provided for the adult male, male genitalia, fourth-instar larva and pupa. All specimens, including the neotype were collected in Río Mapocho, Santiago, Chile in 1945 / 1946, and were deposited in the Entomological Collection of Faculdade de Saúde Pública, Universidade de São Paulo (FSP-USP), Brazil. The neotype was previously invalidly designated the allotype of An. pictipennis by Lane and Neghme (1946). Illustrations are provided for diagnostic characteristics of the male genitalia, and larval stage.

THE BIOLOGIES OF PSEUDOHYLESINUS TSUGAE AND P. GRANDIS (COLEOPTERA: SCOLYTIDAE) IN WESTERN HEMLOCK

1969 ◽  
Vol 101 (3) ◽  
pp. 269-279 ◽  
Author(s):  
J. H. McGhehey ◽  
W. P. Nagel
Keyword(s):  
Life Histories ◽  
Instar Larva ◽  
Fourth Instar ◽  
Western Hemlock ◽  
Fourth Instar Larva ◽  
Larval Instars ◽  
Breeding Material ◽  
Inner Bark ◽  
Host Trees ◽  
Adult Females

AbstractThe life histories of Pseudohylesinus tsugae Swaine and P. grandis Swaine were investigated in young coastal stands of western hemlock. Both P. tsugae and P. grandis had one generation a year with two broods and four larval instars. P. grandis usually overwintered as a teneral adult and P. tsugae as a fourth instar larva. Within thinned stands P. tsugae preferred fresh stumps for breeding material, whereas P. grandis preferred fresh slash. The adult females of both species fed in the inner-bark region of standing, live host trees before initiating egg galleries in slash or stumps.

Accumulation of cadmium by the fourth instar larva of the fly Chironomus thummi

1986 ◽  
Vol 18 (3) ◽  
pp. 395-405 ◽  
Author(s):  
Lisa A. Seidman ◽  
Gerald Bergtrom ◽  
David J. Gingrich ◽  
Charles C. Remsen
Keyword(s):  
Instar Larva ◽  
Fourth Instar ◽  
Fourth Instar Larva ◽  
Chironomus Thummi

scholarly journals Anopheles (Nyssorhynchus) deaneorum: a new species in the albitarsis complex (Diptera: culicidae)

1989 ◽  
Vol 84 (4) ◽  
pp. 535-543 ◽  
Author(s):  
Maria Goreti Rosa-Freitas
Keyword(s):  
New Species ◽  
Genetic Distance ◽  
Adult Female ◽  
Instar Larva ◽  
Fourth Instar ◽  
Type Locality ◽  
Fourth Instar Larva ◽  
External Appearance ◽  
A New Species ◽  
Nei's Genetic Distance

Anopheles (Nyssorhynchus) deaneorum sp. n. is described from specimens collected in Guajará-Mirim, Rondônia state and Rio Branco, Acre state, Brazil, on human and animal baits, inside dwellings and from the progenies of engorged females. A detailed description of the shape of egg, external appearance of adult female and male, genitalias, female cibarial armature and complete chaetotaxy of pupa and larva show that it can be distinguished from Anopheles albitarsis from the type-locality and other areas by the paler general external appearance of the adult, the posterolateral tufts of scales, on the female abdominal terga and the branching of the outer anterior clypeal seta (3-C) of the fourth instar larva (as shown in illustrations). If species can also be distinguished from An. albitarsis from the type locality by the allele frequencies at 11 enzymic loci as represented by Nei's Genetic Distance.

Description of the fourth‐instar larva of Coquillettidia linealis (Diptera: Culicidae)

2020 ◽  
Vol 59 (1) ◽  
pp. 119-126
Author(s):  
Petrina H Johnson ◽  
Richard C Russell
Keyword(s):  
Instar Larva ◽  
Fourth Instar ◽  
Fourth Instar Larva

scholarly journals Anopheles (Cellia) rampae n. sp., alias chromosomal form K of the Oriental Maculatus Group (Diptera: Culicidae) in Southeast Asia

Zootaxa ◽  
2011 ◽  
Vol 2810 (1) ◽  
pp. 47 ◽  
Author(s):  
PRADYA SOMBOON ◽  
DAMRONGPAN THONGWAT ◽  
RALPH E. HARBACH
Keyword(s):  
Southeast Asia ◽  
Sibling Species ◽  
Male Genitalia ◽  
Instar Larva ◽  
Fourth Instar ◽  
Fourth Instar Larva ◽  
Chromosomal Form ◽  
Oriental Region ◽  
As Species

Chromosomal form K (also known as species K) of the Anopheles maculatus group of sibling species in the Oriental Region is diagnosed and formally named An. (Cellia) rampae Harbach & Somboon, n. sp. The male genitalia, pupa and fourth-instar larva are illustrated and information is provided on the morphology, systematics, bionomics and distribution of the species.

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