Putative thermo-/hygroreceptive tarsal sensilla on the sensory legs of an armored harvestman (Arachnida, Opiliones)

Putative thermo-/hygroreceptive tarsal sensilla on the sensory legs of an armored harvestman (Arachnida, Opiliones)

Author Gainett, Guilherme Google Scholar
Michalik, Peter Google Scholar
Mueller, Carsten H. G. Google Scholar
Giribet, Gonzalo Google Scholar
Talarico, Giovanni Google Scholar
Willemart, Rodrigo H. Autor UNIFESP Google Scholar
Abstract Most harvestman species are dependent on high humidity levels and amenable temperatures for homeostasis. While they are known to actively choose environments with these conditions, no thermo/hygroreceptor has yet been identified in harvestmen. Using electron microscopy, we investigated the ultrastructure of two types of hair sensilla of the armored harvestman Heteromitobates discolor (Laniatores, Gonyleptidae): namely the sensillum basiconicum and the hooded sensillum. Both structures occur in small numbers (sensilla basiconica: 28 units

hooded sensilla: 4 units) and are distributed on the distal parts of the legs. On the distalmost tarsomeres I and II, the receptor cells of paired sensilla basiconica and single hooded sensillum occupy a large volume of the inner tissue, and appear tightly associated. The sensillum basiconicum is innervated by 3-4 dendrites and has a longitudinal slit giving the impression of a shaft with two flaps, resembling a beak. The slit probably allows for evaporation of sensillum lymph. The hooded sensillum is innervated by two bundles of three dendrites each, has two pore-like structures on its tip and displays an unusual reticulate cuticle of the shaft. Details of shaft cuticle, the evidence of evaporation of sensillum lymph, and specific innervation patterns support our hypothesis that sensilla basiconica are thermo- and/or hygroreceptors. Even though the definite function of hooded sensilla remains unclear, its putative receptor modalities are assessed by means of specific ultrastructures. Finally, we discuss with regard to functional ultrastructures as to whether the evaporation system of sensilla basiconica fits mechanisms of hygroreception as known from current literature. (C) 2017 Elsevier GmbH. All rights reserved.
Keywords Hygroreceptor
Thermoreceptor
Laniatores
Gonyleptidae
Goniosomatinae
Sensory morphology
Ultrastructure
xmlui.dri2xhtml.METS-1.0.item-coverage Jena
Language English
Sponsor Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
Laudier Histology grant
internal funds of the MCZ
FAPESP
Grant number FAPESP: 2013/23189-1
FAPESP: 2014/07671-0
FAPESP: 2010/00915-0
FAPESP: 2015/01815-9
Date 2017
Published in Zoologischer Anzeiger. Jena, v. 270, p. 81-97, 2017.
ISSN 0044-5231 (Sherpa/Romeo, impact factor)
Publisher Elsevier Gmbh, Urban & Fischer Verlag
Extent 81-97
Origin http://dx.doi.org/10.1016/j.jcz.2017.10.004
Access rights Closed access
Type Article
Web of Science ID WOS:000417075900009
URI https://repositorio.unifesp.br/handle/11600/55418

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