Structure of the labial palp of a larval elaterid (Coleoptera) and of sinus cells associated with its sensilla

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Abstract
Within each labial palp of the larval elaterid Ctenicera destructor (Brown) there is a terminal distal lymph sinus that is separated from the hemocoel in the prementum by a cellular mass in the distal two-thirds of the palp. The sensory neurons of the terminal sensilla form two ganglia that extend from the cellular mass into the prementum. Two types of cells intersperse and surround the cells associated with the sensilla. Elongate gobletlike cells, termed hemolymph sinus cells, extend from the hemocoel to the distal lymph sinus within the ganglia and through the cellular mass. Each contains a sinusoid that opens into the distal sinus. Cuboidal cells, termed basal hemolymph cells, are apposed to and interspersed between the bases of the sinus cells. Both types are associated with the basement membrane bounding the hemocoel and seem to transport materials from hemocoel to distal sinus and perhaps also secrete into the latter. Both types of cells may be differentiated hemocytes.

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