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Arthropod Struct Dev

Title:		"Ultrastructure of pheromone-detecting sensillum placodeum of the Japanese beetle, Popillia japonica Newmann (Coleoptera: Scarabaeidae)"
Author(s):		Kim JY; Leal WS;
Address:		"Laboratory of Chemical Prospecting, National Institute of Sericultural and Entomological Science (NISES), 1-2 Ohwashi, Tsukuba, Ibaraki 305-0053 Japan"
Journal Title:		Arthropod Struct Dev
Year:		2000
Volume:		29
Issue:		2
Page Number:		121 - 128
DOI:		10.1016/s1467-8039(00)00022-0
ISSN/ISBN:		1873-5495 (Electronic) 1467-8039 (Linking)
Abstract:		"The pheromone-detecting sensilla placodea are significantly more numerous than other sensory structures in the antennae of the Japanese beetle, Popillia japonica (Coleoptera: Scarabaeidae). Their abundance in males is nearly twice of that in females, showing a clear sexual dimorphism. Externally, they have a tortoise shell-like round cuticular plate containing a few polygonal plates separated by narrow ridges. Internally, they house two long dendrites that branch and terminate near fine cuticular pores. They have a system of two bipolar neurons accompanied by three enveloping cells, resembling sensilla trichodea in moths. The conspicuous difference with the latter is that the sensillum-lymph cavity near the outer cuticle is funnel-shaped, into which the tormogen cell projects numerous microvilli whose tips approach the terminal branches of the dendrites"
Keywords:
Notes:		"PubMed-not-MEDLINEKim, J Y Leal, W S eng England 2007/12/20 Arthropod Struct Dev. 2000 Apr; 29(2):121-8. doi: 10.1016/s1467-8039(00)00022-0"