Sexual dimorphism in antennal receptors of Phyllophaga ravida Blanchard (Coleoptera: Scarabaeoidea: Melolonthidae)

Romero-López, Ángel Alonso; Morón, Miguel Ángel; Valdez, Jorge

doi:10.1590/s1519-566x2010000600018

Cited by 26 publications

(24 citation statements)

References 20 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The presence of minute pores with pore tubules and subjacent branching outer dendritic segments indicate their olfactory function. Some adult scarab beetles bear small but ‘larval-like’ planar sensilla placoidea [17], while in other species these organs are superficially modified to dome-shaped [49] or sculptured s. placoidea with foldings or cavities [18]. The innervation pattern of adult s. placoidea, however, is in each case similar to the sensory units we found underneath the cuticle of larval pore plates (cp.…”

Section: Discussionsupporting

confidence: 64%

Sensing the Underground – Ultrastructure and Function of Sensory Organs in Root-Feeding Melolontha melolontha (Coleoptera: Scarabaeinae) Larvae

et al. 2012

View full text Add to dashboard Cite

IntroductionBelow ground orientation in insects relies mainly on olfaction and taste. The economic impact of plant root feeding scarab beetle larvae gave rise to numerous phylogenetic and ecological studies. Detailed knowledge of the sensory capacities of these larvae is nevertheless lacking. Here, we present an atlas of the sensory organs on larval head appendages of Melolontha melolontha. Our ultrastructural and electrophysiological investigations allow annotation of functions to various sensory structures.ResultsThree out of 17 ascertained sensillum types have olfactory, and 7 gustatory function. These sensillum types are unevenly distributed between antennae and palps. The most prominent chemosensory organs are antennal pore plates that in total are innervated by approximately one thousand olfactory sensory neurons grouped into functional units of three-to-four. In contrast, only two olfactory sensory neurons innervate one sensillum basiconicum on each of the palps. Gustatory sensilla chaetica dominate the apices of all head appendages, while only the palps bear thermo-/hygroreceptors. Electrophysiological responses to CO2, an attractant for many root feeders, are exclusively observed in the antennae. Out of 54 relevant volatile compounds, various alcohols, acids, amines, esters, aldehydes, ketones and monoterpenes elicit responses in antennae and palps. All head appendages are characterized by distinct olfactory response profiles that are even enantiomer specific for some compounds.ConclusionsChemosensory capacities in M. melolontha larvae are as highly developed as in many adult insects. We interpret the functional sensory units underneath the antennal pore plates as cryptic sensilla placodea and suggest that these perceive a broad range of secondary plant metabolites together with CO2. Responses to olfactory stimulation of the labial and maxillary palps indicate that typical contact chemo-sensilla have a dual gustatory and olfactory function.

show abstract

Section: Discussionsupporting

confidence: 64%

Sensing the Underground – Ultrastructure and Function of Sensory Organs in Root-Feeding Melolontha melolontha (Coleoptera: Scarabaeinae) Larvae

et al. 2012

View full text Add to dashboard Cite

show abstract

“…In most scarab beetles, as in the generality of insects, sex pheromones are released by the females to attract males, and therefore the number of pheromone‐sensitive sensilla (placodea, in case of scarab beetles) is much greater in males (Kim and Leal, ; Leal, ). A similar sexual dimorphism seems to be a rule in Rutelini (Ågren, ; Kim and Leal, ; Mutis et al, ) and Melolonthini (Allsopp, ; Romero‐López et al, ) (Table ), but is not observed in O. eremita . Different density and distribution of olfactory sensilla in various species may reflect different ways in the use of sexual pheromones for intraspecific communication.…”

Section: Discussionmentioning

confidence: 83%

Antennal fine morphology of the threatened beetle Osmoderma eremita (Coleoptera: Scarabaeidae), revealed by scanning electron microscopy

Zauli

Maurizi

Carpaneto

et al. 2016

Microscopy Res & Technique

View full text Add to dashboard Cite

The aim of this study was to characterize the antennal morphology of Osmoderma eremita, a threatened scarab beetle inhabiting tree hollows. O. eremita males produce a sex pheromone, (R)-(+)-γ-decalactone, responsible mainly for the attraction of females but also other males. Gross and fine morphology of microstructures including sensilla, microsculpture and pores were analyzed using Scanning Electron Microscopy. The antenna of O. eremita showed the typical lamellicorn shape of scarab beetles, with a basal scape, a pedicel, a funicle composed of five antennomeres and a club composed of three lamellae. Six different subtypes of sensilla chaetica (Ch.1 - 6), Böhm sensilla (Bo), one subtype of sensilla basiconica (Ba.1), two subtypes of sensilla coeloconica (Co.1 - 2), two subtypes of sensilla placodea (Pl.1 - 2), pores and peculiar folds were described. The two sexes did not show any significant differences in the occurrence and number of the sensilla placodea, known to be responsible for the pheromone reception. Instead, some sexual differences were found on the occurrence and topology of three different microstructures: (1) one subtype of sensillum chaeticum (Ch.2) occurring on the pedicel only in males; (2) a characteristic pore occurring on the funicle only in males; (3) a peculiar fold occurring on different antennomeres of the funicle in the two sexes, on the fourth in males and on the fifth in females. A comparison between sensilla of O. eremita and those of other Scarabaeoidea is provided.

show abstract

“…Comportamento semelhante foi observado em machos de Anomala testaceipennis Blanchard (rOdrigueS et al 2014) e Anomala orientalis (Waterhouse) (FaCundO et al 1999). Nas antenas dos adultos de Scarabaeidae vários sensilos antenais estão presentes, sendo estes os responsáveis pela detecção de feromônio sexual liberados por fêmeas, como observados para Anomala cuprea Hope (leal & mOChizuki 1993), Phyllophaga obsoleta Blanchard (rOmerO-lóPez et al 2004) e Phyllophaga ravida Blanchard (rOmerO-lóPez et al 2010). Assim, a movimentação intensa das antenas dos machos, provavelmente seria para detecção de feromônio sexual liberado pelas fêmeas.…”

Section: Discussionunclassified

Comportamento de cópula em Cyclocephala verticalis Burmeister (Coleoptera: Scarabaeidae)

Barbosa

Rodrigues

2016

EntomoBrasilis

View full text Add to dashboard Cite

Resumo. O gênero Cyclocephala possui grande quantidade de espécies distribuídas nas várias regiões do Brasil, entretanto, poucos são os estudos relacionados ao comportamento de cópula, assim o presente trabalho teve como objetivo estudar o comportamento de cópula de Cyclocephala verticalis Burmeister. Com uma armadilha luminosa instalada ao lado de área de pastagens, foram realizadas coletas de adultos de agosto a setembro de 2013. Em laboratório machos e fêmeas foram mantidos em recipientes separados e ao anoitecer, foram formados casais para observações das etapas que envolvem o comportamento de cópula. De 28 de outubro a 4 de novembro de 2013, para determinar o horário de voo, recolheu-se os insetos coletados na armadilha luminosa a cada 60 min, iniciando os estudos as 18:00 h e encerrando as observações as 6:00 h do dia seguinte. Ao saírem do solo os adultos realizaram ativamente o voo, em seguida pousaram, e o macho ao localizar a fêmea, se aproxima e a toca com o primeiro par de pernas e antenas. Se a fêmea aceita o macho, ocorre à cópula a qual durou 12,5 + 1,3 min em média, e ocorreu entre 19:00 h e 02:00 h. Em algumas ocasiões as fêmeas não aceitaram os machos para a cópula, indicando que os estes provavelmente não estavam aptos a se reproduzirem, ou a própria fêmea não estava apta a se reproduzir, havendo nesse momento reconhecimento químico entre os adultos para a formação do casal. Os adultos revoaram em campo em maiores quantidades das 20:00 h as 23:00 h. Palavras-Chave:Atividade de voo; Comunicação química; Cyclocephalini; Dynastinae; Scarabaeoidea. Mating Behavior in Cyclocephala verticalis Burmeister (Coleoptera: Scarabaeidae)Abstract. The genus Cyclocephala has a large number of species distributed in various regions of Brazil, however, there are few studies related to mating behavior of this group, so this paper was to study the behavior of copulation Cyclocephala verticalis Burmeister. With a light trap installed

show abstract

Sexual dimorphism in antennal receptors of Phyllophaga ravida Blanchard (Coleoptera: Scarabaeoidea: Melolonthidae)

Cited by 26 publications

References 20 publications

Sensing the Underground – Ultrastructure and Function of Sensory Organs in Root-Feeding Melolontha melolontha (Coleoptera: Scarabaeinae) Larvae

Sensing the Underground – Ultrastructure and Function of Sensory Organs in Root-Feeding Melolontha melolontha (Coleoptera: Scarabaeinae) Larvae

Antennal fine morphology of the threatened beetle Osmoderma eremita (Coleoptera: Scarabaeidae), revealed by scanning electron microscopy

Comportamento de cópula em Cyclocephala verticalis Burmeister (Coleoptera: Scarabaeidae)

Contact Info

Product

Resources

About