AN INTRASPECIFIC COMPETITION MODEL FOR THE LEAFMINER, AGROMYZA FRONTELLA (RONDANI)

1988 ◽  
Vol 120 (8-9) ◽  
pp. 779-786 ◽  
Author(s):  
Lothar A. Dohse ◽  
Jeremy N. McNeil
Keyword(s):  
Mathematical Model ◽  
Intraspecific Competition ◽  
Laboratory Experiments ◽  
Larval Density ◽  
Instar Larva ◽  
Larval Competition ◽  
The Third ◽  
Field Samples ◽  
Agromyza Frontella ◽  
Third Instar Larva

AbstractA mathematical model was constructed to simulate the effect of intraspecific larval competition on the survival of Agromyza frontella (Rondani). It was shown that the probabilities of cannibalism and starvation can be expressed as functions of larval density and food availability (leaflet surface area), and that expected pupal weights can be determined from the amount of food available to the third-instar larva. Predictions were compared with data from laboratory experiments and field samples with excellent results.

The sheep headfly, Hydrotaea irritans (Fall.) (Diptera, Muscidae): larval habitat and immature stages

1976 ◽  
Vol 65 (4) ◽  
pp. 579-586 ◽  
Author(s):  
J. Robinson ◽  
M. L. Luff
Keyword(s):  
Adult Stage ◽  
Larval Density ◽  
Instar Larva ◽  
Larval Habitat ◽  
Peat Moss ◽  
Cow Dung ◽  
The Third ◽  
Rotten Wood ◽  
The Mean ◽  
Third Instar Larva

AbstractNumerous habitats were sampled for larvae of sheep headfly, Hydrotaea irritans (Fall.), in infested areas of Northumberland during the winters 1973–74 and 1974–75. Most of the larvae found came from near the surface of soil beneath pasture and long grass. The mean larval density in these sites was 1·93/m2; the greatest density in a single site was 3·87/m2 which compares well with unpublished estimates of adult fly density. Only two larvae were recovered from cow dung. One larva was found in bracken litter, and none in other types of litter, or in horse dung, peat, moss or rotten wood. Larvae were reared to the mid-third instar from eggs laid in the laboratory. Field-collected larvae fed readily on Musca and Calliphora larvae, and did not appear to diapause in December; their identity was confirmed by rearing them to the adult stage. The egg, second- and third-instar larvae, and puparium are described and figured. Descriptions are given of changes in the mouthparts during growth of the third-instar larva, and of the features by which field-collected larvae can be identified.

Further Studies of the Third Instar Larval Cuticle of Calliphora erythrocephala

1955 ◽  
Vol s3-96 (34) ◽  
pp. 181-191
Author(s):  
L. S. WOLFE
Keyword(s):  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Instar Larva ◽  
Secretory Cycle ◽  
Calliphora Erythrocephala ◽  
The Third ◽  
Puparium Formation ◽  
Pore Canals ◽  
Third Instar Larva ◽  
Ammoniacal Silver

The penetration and reduction of ammoniacal silver nitrate solution in the epicuticle of the larva of Calliphora was studied. The epicuticle of the third instar larva is more permeable over the muscle insertions and cuticular sense organs. This finding is related to their development at the previous moult. A surface layer of orientated wax is not present. Proteinaceous and fatty materials from the feeding medium modify the properties of the cuticle surface. Chloroformmethanol extracts a soft light brown acidic lipide from the protein of the epicuticle after contaminants from the medium are removed. The water loss from larvae and puparia of different ages and after various treatments was studied. Young puparia recover from abrasion but larvae do not. An hypothesis that waxy substances are liberated on to the surface of the puparium during hardening and darkening of the cuticle is presented and discussed. The pore canals penetrate the endocuticle until they are cut off from the epidermis by the development of the prepupal cuticle just after the puparial contraction. An inner endocuticle in which pore canals were absent was not found. The structure of the pore canals as shown by phase contrast examination is discussed. The pore canals are three times more concentrated in the lateral regions than in the dorsal or ventral regions. The oenocytes go through a secretory cycle during puparium formation similar to that occurring before moulting of the larva.

Description of the Third-instar Larva and Adult Male of Megasoma sleeperi Hardy (Scarabaeidae: Dynastinae)

10.1649/857.1 ◽  
2006 ◽  
Vol 60 (1) ◽  
pp. 59-67
Author(s):  
Matthew Van Dam ◽  
Alex Van Dam ◽  
Michael D. Wilcox
Keyword(s):  
Adult Male ◽  
Instar Larva ◽  
The Third ◽  
Third Instar Larva

Description of the Third-Instar Larva of Monopsyllus Wagneri (Baker) (Siphonaptera: Ceratophyllidae)1

1976 ◽  
Vol 13 (1) ◽  
pp. 107-111 ◽  
Author(s):  
Harold E. Stark ◽  
Eduardo G. Campos ◽  
Robert E. Elbel
Keyword(s):  
Instar Larva ◽  
The Third ◽  
Third Instar Larva

scholarly journals Storage and Utilization of Reserves by the Garden Chafer, Phyllopertha Horticola L

1956 ◽  
Vol 33 (3) ◽  
pp. 566-575
Author(s):  
ROGER LAUGHLIN
Keyword(s):  
Total Nitrogen ◽  
Instar Larva ◽  
The Other ◽  
Activity Period ◽  
Larval Feeding ◽  
The Third ◽  
Winter Half ◽  
Adult Feeding ◽  
Phyllopertha Horticola ◽  
Third Instar Larva

1. Samples of all stages of Phyllopertha horticola L. have been analysed for fat, total nitrogen and glycogen. 2. Total nitrogen increases throughout the larval feeding period, while fat and glycogen are laid down mainly in the latter half. 3. From November, when the third-instar larva goes into hibernation, until June, when the eggs have been matured and laid, no food is taken. 4. Of the store of fat and glycogen in the hibernating larva at the beginning of the winter, half is used up by the time the adult emerges. The other half is used in the formation of eggs. 5. Adult feeding provides energy for the post-oviposition activity period.

scholarly journals Micromorphology of egg and larva of Eristalis fratercula, with an updated key of Eristalis species with known third instar larvae (Diptera: Syrphidae)

2017 ◽  
Vol 57 (1) ◽  
pp. 215-227 ◽  
Author(s):  
Andrés Campoy ◽  
Celeste Pérez-Bañón ◽  
Tore R. Nielsen ◽  
Santos Rojo
Keyword(s):  
Electron Microscopy ◽  
Instar Larva ◽  
Liquid Media ◽  
Larval Stages ◽  
The Third ◽  
Morphological Studies ◽  
The Common ◽  
Third Instar Larva ◽  
Cryo Scanning Electron Microscopy ◽  
Scanning Electron

Abstract The flower- or hoverflies (Syrphidae) and particularly the subfamily Eristalinae, are known by their importance as pollinators in both natural and agro-ecosystems. Similar to other saprophagous eristalines, the larvae of Eristalis Latreille, 1804 are characterized by an elongated anal segment and a telescopic breathing tube. These features have given them the common name of rat-tailed maggots and allow them to develop in liquid or semi-liquid media loaded with decaying organic material. This paper presents the first description of the egg and the third-instar larva of the boreal species Eristalis fratercula (Zetterstedt, 1838). Morphological studies are presented based on cryo-scanning electron microscopy (cryo-SEM). After comparison with all other known species of the genus Eris-talis with described preimaginal morphology, we conclude that main diagnostic character of E. fratercula is the presence of long branched spicules located in the upper margin on the lateral lips. Finally, we provide an updated key that includes the 15 Eristalis species whose third larval stages have already been described.

Description of the second- and third instar larvae of Platynectes (s. str.) decemnotatus (Aubé, 1838) (Coleoptera: Dytiscidae: Agabinae: Platynectini)

Zootaxa ◽  
2019 ◽  
Vol 4544 (3) ◽  
pp. 381 ◽  
Author(s):  
CESAR J. BENETTI ◽  
MARIANO C. MICHAT ◽  
YVES ALARIE ◽  
NEUSA HAMADA
Keyword(s):  
Instar Larva ◽  
The Other ◽  
The Third ◽  
First Time ◽  
Third Instar Larva ◽  
Third Instar Larvae

The second- and third instar larvae of Platynectes (s. str.) decemnotatus (Aubé, 1838) are described and illustrated in detail for the first time, with special emphasis on morphometry and chaetotaxy. Larvae of P. decemnotatus can be distinguished from most other Agabinae by having secondary setae on the urogomphus and share with the other known species described in detail the presence of a ventroapical spinula on antennomere 3 and the absence of an occipital suture, natatory dorsal setae on tibia and tarsus and natatory setae on urogomphus. Platynectes decemnotatus larvae differ from larvae of Agabus Leach, 1817, Hydrotrupes Sharp, 1882 (currently in Hydrotrupini), Ilybiosoma Crotch, 1873, Ilybius Erichson, 1832 and the previously described Platynectes species in having a one-segmented urogomphus, a character previously observed only in larvae of Agabinus Crotch, 1873. The second- and third instar larvae of P. decemnotatus differ from those of P. (Agametrus) curtulus (Régimbart, 1899) in having the apical lateroventral process of antennomere 3 protruding (not protruding in P. curtulus). The third-instar larva of P. decemnotatus can also be distinguished from that of P. (Gueorguievtes) decempunctatus (Fabricius, 1775) by the absence of secondary dorsal setae on the tibia. 

Larvae of Ceratophyllus wickhami and other Species of Fleas

Parasitology ◽  
1930 ◽  
Vol 22 (2) ◽  
pp. 242-259 ◽  
Author(s):  
Enid K. Sikes
Keyword(s):  
Life History ◽  
Seventeenth Century ◽  
Instar Larva ◽  
Grey Squirrel ◽  
Experimental Conditions ◽  
Tracheal System ◽  
Xenopsylla Cheopis ◽  
The Third ◽  
History Of ◽  
Third Instar Larva

A short historical account is given of the writings on flea larvae since the seventeenth century. The larvae have been known since Leeuwenhoek tried to breed them in 1683.The life-history of Ceratophyllus wickhami is described. The fleas were bred in the laboratory on a grey squirrel. Three larval instars occur, and the life-history occupies, on an average, 6 weeks under experimental conditions.The external anatomy of the third instar larva of C. wickhami is described. The mouth parts are generalised and suggest the condition of a primitive insect. The tracheal system is composed of a double longitudinal trunk on each side, with spiracles on the prothorax, metathorax and first eight abdominal segments.The first and second instar of C. wickhami are similar to the third instar larvae, except in size and the presence of a hatching spine in the first stage.The larva of Ceratophyllus fasciatus is mentioned. The importance of the species lies in the presence of completely separated galea and lacinia.Larvae of Xenopsylla cheopis and X. astia are briefly described. The larvae of the two species are practically identical except for the shape of the mandibles.

Taxonomic notes on genus Coelotrypes Bezzi (Diptera: Tephritidae: Trypetinae) with description of two new species

Zootaxa ◽  
2019 ◽  
Vol 4563 (3) ◽  
pp. 584
Author(s):  
K. J. DAVID ◽  
D. L. HANCOCK
Keyword(s):  
New Species ◽  
Instar Larva ◽  
The Third ◽  
Two New Species ◽  
Third Instar Larva

Two new species of Coelotrypes Bezzi, C. meremmiae sp. n. and C. paralatilimbatus sp. n. are described from India. Postabdominal structures and the third instar larva of C. luteifasciatus (Senior-White) are also illustrated and described. A key to Oriental species of Coelotrypes is provided. 

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