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      Morfología y protrusión-retracción de la cámara genital femenina de Phyllophaga obsoleta (Coleoptera: Melolonthidae) Translated title: Morphology and protrusion-retraction of the female genital chamber of Phyllophaga obsoleta (Coleoptera: Melolonthidae)


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          Las hembras de Phyllophaga obsoleta (Blanchard) (Coleoptera: Melolonthidae), una de las especies de mayor importancia agrícola en México, presentan un "llamado sexual" en el cual exponen una estructura en forma de bolsa del ápice abdominal y provocan la atracción de los machos. El contenido de esta estructura se ha extraído en estudios previos con diferentes disolventes y se ha confirmado su actividad biológica mediante bioensayos con túnel de viento y electroantenografía. Sin embargo, las características morfológicas de esta "bolsa" no han sido estudiadas. Por ello, en el presente trabajo se caracterizó morfológicamente los terminalia del abdomen femenino de P. obsoleta y se estudió el mecanismo de protrusión-retracción de la estructura en forma de bolsa. Se realizaron disecciones longitudinales de los terminalia del abdomen de hembras para su análisis con microscopía estereoscópica. Se encontró que la "bolsa" es la cámara genital protráctil (CGP), propia de las hembras de Melolonthidae y que se encuentra flanqueada por músculos esterno-saculares laterales y esterno-saculares ventrales, así como de membranas intersegmentales VIII y IX. Músculos y membranas podrían estar involucrados en los procesos de protrusión y retracción de la CGP.

          Translated abstract

          The females of Phyllophaga obsoleta (Blanchard) (Coleoptera: Melolonthidae) have a great agricultural importance in Mexico. They display a "sexual calling" behavior, that expose a bag-like structure on the abdominal tip, wich causes them to attract the males. The content of this structure has been extracted and confirmed his biological activity by wind tunnel and electroantenography bioessays. Nevertheless, their morphologic characteristics have not been studied yet. For that reason in the present study, the P. obsoleta abdominal terminalia were characterized morphologically and protrusion-retraction mechanism of bag-like structure was studied. Longitudinal dissections of the abdominal terminalia were analyzed with stereoscopic microscopy. The bag-like structure is the protractile genital chamber (PGC) of Melolonthidae females and its protrusion and retraction is related to the activity of lateral sterno-sacular muscles with ventral sterno-sacular muscles, as well as for intersegmental membranes VIII and IX. They should be involucrated in protrusion and retraction PGC mechanisms.

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          Most cited references20

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          Chemical ecology of phytophagous scarab beetles.

          Sex pheromones have been characterized only for species in the subfamilies Rutelinae and Melolonthinae; aggregation pheromones have been identified for two species in the Dynastinae. Melolonthines utilize mainly amino acid derivatives and terpenoid compounds, but sex pheromones of rutelines are fatty acid derivatives. Various other species utilize japonilure-type lactones that are produced by desaturation of fatty acids, followed by hydroxylation, chain shortening, and cyclization. In marked contrast to melolonthine sex pheromone glands that are everted from the abdominal tip, ruteline sex pheromone glands consist of epithelial cells that line the inner surfaces of the pygidium and two apical sternites. Some species that are geographically and/or seasonally isolated utilize the same sex pheromone system, but chirality plays an important role in the isolation of the communication channels of two ruteline species, where one enantiomer is utilized as sex pheromone and the other is a behavioral antagonist. Olfactory receptor neurons (ORNs) are specifically tuned to these enantiomeric pheromones. It is unlikely that the specificity of these ORNs is achieved only by odorant-binding proteins. Pheromone-degrading enzymes are present in scarab beetle antennae and show considerable substrate specificity.
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            Estudio sobre coleópteros del suelo en América

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              Flight, feeding and reproductive behavior of Phyllophaga cuyabana (Moser) (Coleoptera: Melolonthidae) adults

              Phyllophaga cuyabana is a univoltine species and its development occurs completely underground. Its control by conventional methods, such as chemical and biological insecticides, is difficult, so it is important to understand its dispersion, reproduction, and population behavior in order to determine best pest management strategies. The objective of this work was to study the behavior of adults of P. cuyabana. This study was carried out in the laboratory, greenhouse and field sites in Paraná State, Brazil (24º25' S and 52º48' W), during four seasons. The results obtained demonstrate that: a) P. cuyabana adults have a synchronized short-flight period when mating and reproduction occurs; b) adults tend to aggregate in specific sites for mating; c) the majority of adults left the soil on alternate nights; d) the choice of mating and oviposition sites was made by females before copulation, since after copulation adults did not fly from or bury themselves at nearby locations; e) females that fed on leaves after mating, oviposited more eggs than females that had not fed;f) plant species such as sunflower (Helianthus annuus) and the Crotalaria juncea are important food sources for adults.

                Author and article information

                Acta zoológica mexicana
                Acta Zool. Mex
                Instituto de Ecología A.C. (Xalapa, Veracruz, Mexico )
                August 2009
                : 25
                : 2
                : 315-321
                [03] orgnameInstituto de Ecología, A.C. MÉXICO miguel.moron@ 123456inecol.edu.mx
                [02] Estado de México orgnameColegio de Postgraduados orgdiv1Campus Montecillo MÉXICO
                [01] Yautepec Morelos orgnameInstituto Politécnico Nacional orgdiv1Centro de Desarrollo de Productos Bióticos MÉXICO
                S0065-17372009000200006 S0065-1737(09)02500200006

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                : 15 September 2008
                : 28 February 2008
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 19, Pages: 7

                SciELO Mexico

                Artículos originales

                Phyllophaga obsoleta,protrusión,retracción,calling,genital chamber,protrusion,retraction,llamado sexual,cámara genital


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