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      Palpos labiales de la mariposa Prestonia clarki (Lepidoptera: Pieridae). Ultraestructura de órganos sensoriales y sensilas Translated title: Labial palps of the butterfly Prestonia clarki (Lepidoptera: Pieridae). Ultrastructure of sensilla and sensory organs

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          Abstract

          Resumen Los trabajos sobre palpos labiales son muy escasos en Lepidoptera y requieren del uso del microscopio electrónico de barrido. Los tres artejos de los palpos labiales de la coliadina Prestonia clarki se describen e ilustran, así como la distribución de las sensilas y de sus estructuras más distintivas: la mancha sensitiva de Reuter y el órgano Palp pit; el artejo basal es de mayor longitud y el distal el de menor. Se encontraron sensilas quéticas tipo 1 en la superficie de la vista lateral externa de los tres artejos. Las sensilas son más especializadas en el parche o mancha sensitiva de Reuter y en el órgano Palp pit. En la vista lateral interna de la sección proximal del artejo basal se observó esa mancha, la cual comprende un área alargada que integra cientos de microtriquias, diferenciada en tres secciones, cuya área adyacente muestra menor número de microtriquias y de menor longitud. En un corte longitudinal del artejo distal, en su porción más apical, se observó el órgano Palp pit, con forma de botella; en su interior se alojan dos tipos de estructuras, cuya disposición fue: sensilas celocónicas en la sección basal y microtriquias en la distal. Además, se encontraron en el interior del Palp pit dos tipos sensilares de difícil determinación, se denominaron sensilas quéticas tipos 2 y 3, así como las sensilas quéticas tipo 1, localizadas en el borde del Palp pit. Los tipos encontrados y su distribución en el Palp pit coinciden con lo descrito por varios autores en otras especies de lepidópteros.

          Translated abstract

          Abstract Research on labial palps of Lepidoptera is scarce and requires the use of Scanning Electron Microscopy techniques. We describe and illustrate the three segments composing the labial palps of the Coliadinae butterfly Prestonia clarki, as well as the distribution of sensilla and both of palp’s distinctive structures: the Reuter’s sensitive patch and the Palp pit organ; in the palps, the basal segment is the longest, and the distal segment is the shortest. We found chaetic sensilla type 1 on the lateral outer surface of the segments. In the Reuter’s sensitive patch and the Palp pit organ, sensilla are specialized. In a lateral internal view of the proximal section of the basal segment, Reuter’s sensitive patch looks as an elongated area with hundreds of microtrichia, differentiated into three sections; the adjacent area shows fewer microtrichia of shorter length. In a longitudinal view of the distal segment, at the apex of the segment, is the bottle-shaped Palp pit organ; inside the Palp pit are coeloconic sensilla in the basal section and microtrichia in the distal one. In addition, two indeterminate types of sensilla similar to chaetic ones were found within the Palp pit; which we called chaetic sensilla types 2 and 3; chaetic sensilla type 1 are located on the edge of the Palp pit. The sensilla types and their distribution in the Palp pit agree with those described in other species of Lepidoptera. Rev. Biol. Trop. 66(3): 1324-1346. Epub 2018 September 01.

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          Most cited references 53

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          Relationship between structure and function of antennal chemo-, hygro-, and thermoreceptive sensilla in Periplaneta americana.

           I Altner,  H Sass,  H Altner (1977)
          On the antennae of Periplaneta americana, 25 chemo-, hygro- or thermosensitive sensilla were investigated electrophysiologically and, after marking, by transmission and scanning electron microscopy. A clear-cut relationship of functional types to structural types was observed. Two different stimulus conducting structures were observed: a) pore tubules which are found only in smooth, single-walled sensory pegs and b) secretion-filled canals which occur only in grooved double-walled sensilla. Temperature- and humidity-sensitive receptors occur only in double-walled sensilla with secretion material as the stimulus conducting system. Olfactory sensory cells were found in both types, however, those with a specific sensitivity for short-chain n-alcohols are restricted to single-walled pegs with pore tubules, while those which are most sensitive to short-chain n-acids and amines are found in double-walled sensilla, sometimes together with thermosensitive units. The stimulus conducting systems may control the access of odorous substances to the dendritic membranes and thus contribute to the discriminatory properties of the sensilla.
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            Molecular phylogeny and systematics of the Pieridae (Lepidoptera: Papilionoidea): higher classification and biogeography

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              Carbon-dioxide sensing structures in terrestrial arthropods.

               G Stange,  S Stowe (1999)
              Sensory structures that detect atmospheric carbon dioxide have been identified and described to the subcellular level in adults of Lepidoptera, Diptera, Hymenoptera, Isoptera, Chilopoda, and Ixodidae, as well as in lepidopteran larvae. The structures are usually composed of clusters of wall-pore type sensilla that may form distinct sensory organs, often recessed in pits or capsules. In insects, they are located on either the palps or the antennae, in chilopods on the head capsule, and in ixodids on the forelegs. In the two cases where the central projections have been examined (Lepidoptera and mosquitoes), the clustering is preserved to the level of second order neurons, which are located in the deutocerebrum. Individual sensilla usually contain a single receptor neuron that is sensitive to CO(2); it may be accompanied by other neurons that respond to other olfactory qualities. The distal dendritic processes of CO(2)-sensitive neurons invariably show an increased surface area, dividing into many cylindrical branches or into lamellar structures. Lamellar membranes are often closely linked to arrays of microtubules. Fine pore canal tubules are usually associated with the cuticular pores. Copyright 1999 Wiley-Liss, Inc.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbt
                Revista de Biología Tropical
                Rev. biol. trop
                Universidad de Costa Rica (San José, San José, Costa Rica )
                0034-7744
                0034-7744
                September 2018
                : 66
                : 3
                : 1324-1346
                Affiliations
                orgnameUniversidad Nacional Autónoma de México Mexico ivf@ 123456ciencias.unam.mx
                orgnameSmithsonian Institution USA enantia@ 123456prodigy.net.mx
                Article
                S0034-77442018000301324
                10.15517/rbt.v66i3.31258

                This work is licensed under a Creative Commons Attribution 3.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 62, Pages: 23
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