The pedipalp of Pseudocellus pearsei (Ricinulei, Arachnida) - ultrastructure of a multifunctional organ |
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| Authors: | Talarico G Palacios-Vargas J G Alberti G |
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| Institution: | 1. Zoologisches Institut und Museum, Ernst Moritz Arndt Universität Greifswald, Johann Sebastian Bach Str. 11/12, 17489 Greifswald, Germany;2. Laboratorio de Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Universidad Nacional Autónoma de México, Ciudad de México, México;1. Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Av. Universidad 3000, C.P. 04510, Coyoacán, Ciudad de México, Mexico;2. Colección Nacional de Arácnidos, Instituto de Biología, Circuito exterior s/n, Ciudad Universitaria, Copilco, Coyoacán A.P. 70-233, Distrito Federal C.P. 04510, Mexico;3. Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Apartado Postal 510-3, Cuernavaca Morelos 62210, Mexico;1. Department of Integrative Biology, University of Wisconsin-Madison, 430 Lincoln Drive, Madison, WI 53706, USA;2. Museum of Comparative Zoology & Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA;3. Biology Department, Macalester College, 1600 Grand Avenue, St. Paul, MN 55105, USA;4. Department of Terrestrial Biodiversity, Queensland Museum, Grey Street, South Bank, Brisbane, Queensland, Australia;5. Department of Terrestrial Zoology, Western Australian Museum, Locked Bag 49, Welshpool DC 6986, Western Australia, Australia;1. CNRS UMR 6118 Géosciences & OSUR, Université de Rennes 1, Campus de Beaulieu bât. 15, 263 avenue du Général Leclerc, 35042, Rennes cedex, France;2. Royal Saskatchewan Museum, 2445 Albert St., Regina, Saskatchewan, S4P 4W7, Canada;3. Biology Department, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada;1. Programa de Pós-Graduação em Entomologia, Departamento de Entomologia, Universidade Federal de Viçosa, Brazil;2. Departamento de Biologia Geral, Universidade Federal de Viçosa, Brazil;3. Centro de Ciências Agrárias, Departamento de Biologia, Universidade Federal do Espírito Santo Alegre, ES, Brazil;1. Department of Biological Sciences, Macquarie University, Sydney, Australia;2. School of Biological Sciences, University of Nebraska, Lincoln, USA;3. Biozentrum Grindel, Zoological Institute and Museum, University of Hamburg, Hamburg, Germany |
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| Abstract: | Ricinulei possess movable, slender pedipalps with small chelae. When ricinuleids walk, they occasionally touch the soil surface with the tips of their pedipalps. This behavior is similar to the exploration movements they perform with their elongated second legs. We studied the distal areas of the pedipalps of the cavernicolous Mexican species Pseudocellus pearsei with scanning and transmission electron microscopy. Five different surface structures are characteristic for the pedipalps: (1) slender sigmoidal setae with smooth shafts resembling gustatory terminal pore single-walled (tp-sw) sensilla; (2) conspicuous long, mechanoreceptive slit sensilla; (3) a single, short, clubbed seta inside a deep pit representing a no pore single walled (np-sw) sensillum; (4) a single pore organ containing one olfactory wall pore single-walled (wp-sw) sensillum; and (5) gustatory terminal pore sensilla in the fingers of the pedipalp chela. Additionally, the pedipalps bear sensilla which also occur on the other appendages. With this sensory equipment, the pedipalps are highly effective multimodal short range sensory organs which complement the long range sensory function of the second legs. In order to present the complete sensory equipment of all appendages of the investigated Pseudocellus a comparative overview is provided. |
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