Egg length of Anastrepha obliqua Macquart (Diptera, Tephritidae) according to oviposition rate and maternal age

Boleli, Isabel Cristina; Teles, M. Madalena da Costa

doi:10.1590/s0101-81751992000200007

Rev. Bras. Zool.

1992

DOI: 10.1590/s0101-81751992000200007

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Egg length of Anastrepha obliqua Macquart (Diptera, Tephritidae) according to oviposition rate and maternal age

Isabel Cristina Boleli

M. Madalena da Costa Teles

Abstract: ABSTRACT. The length of the enlire egg, micropile and vitellus regions of Anastrepha obliqua Macquart, 1835 were measured during ali oviposition period. Obtained values were compared among them and with oviposition rate. The smallest eggs were produced during lhe first 35 oviposition days, period where the highest oviposition rate occured. The decrease in egg length was found to be due to a descrease in the vitellus region. Micropile length was found to be pratically constant throughout oviposition. Furthermor… Show more

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Cited by 2 publications

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Extrusion of masses of yolk during embryonary development of the fruit flyAnastrepha fraterculus

Selivon¹,

Morgante²,

Ribeiro³

et al. 1996

Invertebrate Reproduction & Development

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Eggs of the fruit fly Anastrephafiaterculus (Diptera; Tephritidae) present an extensive variation in size. On average, they measured 1,4 15h86 pm in length and 24 1h 16 pm in diameter. In vivo analysis of the embryonic development showed that, during gastrulation, the embryos may extrude a mass of yolk from their posterior end. Later on, during the development of the head, a similar mass may also be extruded fiom the anterior end. Four types of embryos were found:(1) embryos with masses at both ends; (2) embryos with only the anterior mass; (3) embryos showing just the posterior mass and (4) embryos without any mass. They occur in different frequencies in a sample of embryos collected fiom a population cage in which type 1 embryos were the most common. The masses varied in size, there being no significant differences between the anterior and posterior ones, nor among masses fiom different types of embryos. The masses are made of yolk material and contain a variable number of vitellophages. Hoechst staining revealed the presence of symbiont bacteroids in the masses. Electron microscopy confirmed these results. Just before hatching, the larva eats the anterior mass, then makes a 180" turn inside the egg, ingests the posterior mass and finally hatches near the posterior pole of the egg. The extrusion of the masses and the complex behavior of the larva may be related to the mechanism of bacterial infestation in this species.

show abstract

Extrusion of masses of yolk during embryonary development of the fruit flyAnastrepha fraterculus

Selivon¹,

Morgante²,

Ribeiro³

et al. 1996

Invertebrate Reproduction & Development

View full text Add to dashboard Cite

show abstract

Egg size, yolk mass extrusion and hatching behavior in two cryptic speciesof Anastrepha fraterculus (Wiedemann) (Diptera, Tephritidae)

1997

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Variations in egg length were observed for two populations of cryptic species of Anastrepha fraterculus (Wiedemann). The eggs of type I flies were smaller than those of type II individuals. For both types, in regard to yolk mass extrusion, four classes of embryos were detected. Class 1: embryos that extrude masses at both extremities; class 2: embryos in which extrusion occurs only at the anterior pole; class 3: embryos that eliminate mass only at the posterior pole, and class 4: embryos that do not extrude any mass. Embryo class frequencies were similar for populations belonging to the same type, but different between types. Individual females may produce eggs from different embryo classes, but for any given female the pattern remains constant during a long period of oviposition. Variation in size of the extruded masses was similar for both populations. Individual females produced embryos with a small range of mass diameters, and different females produced masses of different mean size. However, individual mass size remained constant during oviposition. The results suggest the existence of genetic components involved in the control of this unusual process. Larvae of both types presented, just before eclosion, similar unusual behaviors: they ingest the anterior extruded mass, rotate 180°, absorb the posterior mass and eclose near the posterior pole. Data show that cryptic A. fraterculus type I and type II differs in regard to egg size as well as to the phenomenon of yolk mass extrusion
As duas espécies crípticas de Anastrepha fraterculus, tipo I e tipo II, diferiram quanto ao tamanho dos ovos, os quais são menores no tipo I. Em ambos pode ocorrer a extrusão de vitelo pelas extremidades dos embriões, observando-se quatro classes: 1) embriões com massas extrudadas por ambos os pólos; 2) extrusão apenas pelo pólo anterior; 3) extrusão pelo pólo posterior e 4) embriões que não eliminam as massas. As freqüências dessas classes são similares entre populações de um mesmo tipo, mas diferem entre as duas formas crípticas. Diferentes fêmeas podem produzir diferentes classes de embriões, mas para cada fêmea o padrão é constante e não varia durante um longo período do ciclo de oviposição. O diâmetro das massas extrudadas é variável, mas de igual magnitude para os dois tipos. Fêmeas distintas podem produzir massas de diferentes diâmetros que não se alteram em suas progênies. Os resultados sugerem que componentes genéticos estão envolvidos no controle da extrusão de vitelo pelos embriões de Anastrepha. As larvas, de ambos os tipos, apresentam comportamento não usual pouco antes da eclosão: ingerem a massa de vitelo do pólo anterior, giram dentro do ovo ficando com a cabeça no pólo posterior, sugam a massa de vitelo do pólo posterior e eclodem perto desse pól

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Egg length of Anastrepha obliqua Macquart (Diptera, Tephritidae) according to oviposition rate and maternal age

Cited by 2 publications

References 16 publications

Extrusion of masses of yolk during embryonary development of the fruit flyAnastrepha fraterculus

Extrusion of masses of yolk during embryonary development of the fruit flyAnastrepha fraterculus

Egg size, yolk mass extrusion and hatching behavior in two cryptic speciesof Anastrepha fraterculus (Wiedemann) (Diptera, Tephritidae)

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