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J Morphol


Title:Cellular organization of the dome sensillum: A presumed chemoreceptor in Gammarus setosus (Gammaridea: Amphipoda)
Author(s):Steele VJ;
Address:"Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X9, Canada"
Journal Title:J Morphol
Year:1994
Volume:220
Issue:2
Page Number:103 - 122
DOI: 10.1002/jmor.1052200202
ISSN/ISBN:1097-4687 (Electronic) 0022-2887 (Linking)
Abstract:"A previously unknown type of sensillum with a thin cuticular dome and two pairs of pores is described in the amphipod Gammarus setosus. There is only one dome sensillum on each interantennal lobe of the head. The receptor is innervated by two sensory dendrites that bifurcate into two pairs of 9 + 0 cilia, concentrically enclosed by four auxiliary cells-two thecogen, one trichogen, and one tormogen and surrounded by a cluster of accessory cells. The ciliary regions are contained in small inner lymph cavities. The outer segments are sheathed by the apical extensions of the thecogen cells, are looped inside the outer lymph cavity, and come in close contact with lipid spheroids inside the dome. The basal bodies consist of microtubule doublets, which extend into the distal segments where they are interspersed with singlets. The nodal inner dendritic segments join the ventral suspension cord of the organ of Bellonci and enter its ganglion. The application of colloidal lanthanum resulted in intraciliary lanthanum deposits. The dome sensilla are presumed to be chemosensory because their cellular plan has similarities to that of some known olfactory and pheromone-sensitive sensilla in decapod crustaceans and insects. (c) 1994 Wiley-Liss, Inc"
Keywords:
Notes:"PubMed-not-MEDLINESteele, V J eng 1994/05/01 J Morphol. 1994 May; 220(2):103-122. doi: 10.1002/jmor.1052200202"

 
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