Fine structure of the antennal glands of the ant nest beetle Paussus favieri (Coleoptera,Carabidae, Paussini) |
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| Authors: | Andrea Di Giulio Marco Valerio Rossi Stacconi Roberto Romani |
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| Institution: | 1. Dipartimento Biologia, Università degli Studi Roma Tre, Viale G. Marconi, 446, 00146 Roma, Italy;2. Dipartimento di Scienze Agrarie ed Ambientali, Università degli Studi di Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy;1. Division of Oncology and Hematology, Istituto Clinico Humanitas, Via Manzoni 56, Rozzano, 20089 Milano, Italy;2. Breast Surgery Unit, Istituto Clinico Humanitas, Rozzano, Milano, Italy;3. Biostatistics Unit, Istituto Clinico Humanitas, Rozzano, Milano, Italy;4. Department of Pathology, Istituto Clinico Humanitas, Rozzano, Milano, Italy;1. Urology, Andrology and Kidney Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy;2. Renal, Dialysis and Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy;3. Renal, Dialysis and Transplantation Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy;1. Department of Medical, Oral and Biotechnological Sciences, University “G. d’annunzio”, Chieti-Pescara, Italy;2. Department of Oral Science, Sapienza University of Rome, Italy;3. Department of Clinical Sciences and Bioimaging, University ‘G. d’Annunzio’, Chieti, Pescara, Italy;1. U.O.C. Division of Immunohematology, Transfusion Medicine and Transplant Immunology (SIMT), Regional Reference Laboratory of Transplant Immunology (LIT), Azienda Ospedaliera Universitaria (AOU), Second University of Naples, Naples, Italy;2. Department of General Pathology, Division of Clinical Pathology and Excellence Research Centre on Cardiovascular Disease, Second University of Naples, Naples, Italy;3. Cardiovascular Rehabilitation, Salvatore Maugeri Foundation, IRCCS, Telese Terme (BN), Italy;4. General, Thoracic and Vascular Surgery Department, General Surgery and Organ Transplantation, “Federico II” University of Naples, Naples, Italy;5. Department of General Surgery and Transplantation Unit, San Giovanni di Dio e Ruggi D’Aragona University Hospital, Scuola Medica Salernitana, Salerno, Italy;1. Dipartimento di Scienze Anestesiologiche, Medicina Critica e Terapia del Dolore, “Sapienza” University of Rome, Policilinico Umberto I, Rome, Italy;2. Dipartimento “Paride Stefanini”, Cattedra di Chirurgia Toracica, “Sapienza” University of Rome, Policilinico Umberto I, Rome, Italy |
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| Abstract: | The antennae of the ant nest beetle Paussus favieri are studied by using both SEM and TEM. In the myrmecophilous genus Paussus, these structures are composed of three joints: scape, pedicel and a wide third joint, the “antennal club”, resulting from the fusion of antennomeres A3–A11 (flagellum). The antennal club shows an exceptional glandular activity, with the presence of pores mostly crowded in special hairless cuticular areas, surrounding the base of single setae, grouped at the base of tufts of setae, or positioned inside deep pockets that store the secretions, with filiform material arising from them. The surface of A1 and A3 are covered by mechanoreceptors, modified to spread the glandular exudates, while the chemoreceptors are restricted to the apex of the club. The fine structural analysis shows a great number of antennal glands, that can be referred to three main typologies: type A (GhA) bi-cellular, composed of a large secretory cell and a small duct cell, positioned close to the antennal surface; type B (GhB), tri-cellular, composed of two secretory cells and one duct cell, less frequent and positioned deep inside the antennal club; type C (GhC), rare, located deeply within the antennal lumen, in the vicinity of the trophocytes. This complexity indicates that more than one substance could be released from the antennae. Possible functional aspects of the secretions dealing with symbiotic interaction with the host ants are discussed. |
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