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Other literature type . 2001
License: CC 0
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Other literature type . 2001
License: CC 0
Data sources: Datacite
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Other literature type . 2001
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Dundubia spiculata Noualhier 1896

Authors: Boulard, Michel;

Dundubia spiculata Noualhier 1896

Abstract

5. - Dundubia spiculata Noualhier, 1896 Platylomia spiculata Distant, 1906 et auct. plur.; Dundubia spiculata Chou et al., 1997. Belle espèce de taille moyenne (58 mm de longueur totale pour 96 mm d'envergure) à dominante vert clair. Les mâles se reconnaissent aisément par la forme spatulée se terminant en pointe triangulaire de leurs longs opercules (fig. 1, G). Il s'agit d'une espèce crépusculaire hantant les jeunes branches du feuillage. Si sa cymbalisation grésillo-sifflante, assez agréable, permet de localiser aisément l'ensemble végétal où elle se trouve, la détecter précisément relève du tour de force ou de l'exploit chanceux: les signaux, identiques et tous très riches en harmoniques ricochent de feuilles en feuilles, affolant littéralement nos oreilles, incapables alors de nous orienter vers la source cymbalaire. Ajoutons à cela que Dundubia spiculata commence à se manifester le jour finissant et poursuit jusqu'à l'installation complète de la nuit, cequientraved'autantlespossibilitésd'observations.SaC.I.A.(fig. 7)estanalyséeici. a: oscillogramme temporel transcrivant en temps réel 20s du plein appel; il s'agit d'une reproduc¬ tion uniforme, mais doublement crétée, de signaux très denses, très rapprochés entre eux. b: oscillogramme obtenu pour espace-temps arbitraire, transcrivant et amplifiant une seconde du plein signal prélevée au hasard, plage inversée en a, et mettant en évidence la structure répétitive charpentant cette cymbalisation. La cymbalisation s'avère fondée sur l'envoi de signaux principa¬ lement groupés en 3/10e se seconde. c: spectrogramme étiré conforme à l'oscillogramme b. Le fondamental, très bas en fréquence (1 600 Hz) est aussi peu énergétque; en revanche une quinzaine d'harmoniques, dont les formants que l'on peut numéroter de 3 à 12 et s'élevant en fréquences jusqu'à près de 16000 Hz, se montrent particu¬ lièrement efficaces, tandis que les suivants sont évanescents. d: le tracé du spectre moyen confirme la richesse en harmoniques et la spécificité originale de la cymbalisation crépusculaire de Dundubia spiculata. Femelle et accouplement non vus.

Published as part of Boulard, Michel, 2001, Statut acoustique et comportement sonore de quelques Cigales thaïlandaises. Description d'une espèce nouvelle (Homoptera, Cicadidae), pp. 127-147 in Bulletin de la Société entomologique de France 106 (2) on pages 137-138, DOI: 10.3406/bsef.2001.16740, http://zenodo.org/record/7129367

Keywords

Hemiptera, Insecta, Dundubia, Arthropoda, Animalia, Biodiversity, Dundubia spiculata, Taxonomy, Cicadidae

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