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      A peculiar cave species of Tomocerus (Collembola, Tomoceridae, Tomocerinae) from Vietnam, with a discussion of the postantennal organ and prelabral chaetae in Tomocerinae

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          Abstract

          Abstract

          The first Tomocerus species with a postantennal organ (PAO) in the adult stage is described from Vietnam. Tomocerus postantennalis sp. n. differs from the other PAO-possessing tomocerid, Tomolonus reductus Mills, 1948, mainly in the morphology of PAO, the number of ocelli, the number of chaetae in trochantero-femoral organ and several features of the furca. The new species is placed in Tomocerus because of the presence of a toothlet on the outer basal mucronal tooth and the absence of the diagnostic character states of Plutomurus Yosii, 1956 and Aphaenomurus Yosii, 1956. Besides the presence of PAO, the new species is peculiar in having six prelabral chaetae, instead of four as in other Tomocerus species. The new species is similar to Tomocerus folsomi Denis, 1929 and Tomocerus ocreatus Denis, 1948 in the type of dental spines but different from them in the body colour, the relative length of antennae to body, the number of unguis inner teeth and the number of mucronal intermediate teeth.

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          Most cited references 7

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          Zoologiae Danicae prodromus : seu Animalium Daniae et Norvegiae indigenarum ; characteres, nomina, et synonyma imprimis popularium / Auctore Othone Friderico Müller ... Impensis auctoris.

           Otto Müller (1776)
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            The postantennal organ: a specialized unicellular sensory input to the protocerebrum in apterygotan insects (Collembola).

             W G Thies,  H Altner (1976)
            A postantennal organ occurs in three different families in Collembola. In spite of considerable diversity in their outer structures, the organs manifest many similarities in their internal structure (pore system with pores of about 50-100 A diameter, a single sensory cell with two branching ciliary outer segments, reduction of the outer receptor lymph cavity and occurrence of an electron dense secretion around the dendrites). A tendency towards an enlargement of the outer surface of the organ and towards an incorporation of the sensory cell into the protocerebrum appears to be correlated with adaptations to a strict euedaphic life. An appropriate stimulus for the organ cannot be derived from the structure unequivocally, however, it could be hygro-, chemo- or thermosensitive. Perforated surface and number of pores in the postantennal organ correspond to the values found in insect sensory hairs.
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              The structure of the postantennal organ in Onychiurus sp. (Insecta: Collembola) and its connection to the central nervous system

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                Author and article information

                Contributors
                Journal
                Zookeys
                Zookeys
                ZooKeys
                ZooKeys
                Pensoft Publishers
                1313-2989
                1313-2970
                2014
                12 May 2014
                : 408
                : 61-70
                Affiliations
                [1 ]School of Life Sciences, Nanjing University, Nanjing 210093, China
                [2 ]Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
                [3 ]Muséum National d’Histoire Naturelle, UMR7205 CNRS/MNHN, CP50, 45 rue Buffon, 75005 Paris, France
                Author notes
                Corresponding author: Louis Deharveng ( deharven@ 123456mnhn.fr )

                Academic editor: L. Penev

                Article
                10.3897/zookeys.408.7030
                4042826
                Daoyuan Yu, Feng Zhang, Louis Deharveng

                This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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                Research Article

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