Sensilla development

Sexual dimorphism of antenna sensillum types does not become morphologically apparent before the adult stage. Antennal segments increase in length approximately three-fold during postembryonic development in both males and females (Schafer and Sanchez, 1976). In the female, the sensillar population increases 7.5-fold, whereas adult males have 12 times more sensilla than first instars the difference results from a significant proliferation of olfactory sensilla in males. 

Schaller, D. (1978). Antennal sensory system of Periplaneta americana L. Distribution and frequency of morphologic types of sensilla and their sex-specific changes during postembryonic development. Cell and Tissue Research 191 121-139. 

The presensillum clusters form in a characteristic pattern of three half elliptical domains in the antennal disk, in a temporal sequence from out to in (Figure 23.IE). The early expression patterns of ato and amos in the antennal disk outline domains that determine the distribution patterns of the developing sensillum categories. On the palp ato specifies B sensilla (Gupta and Rodrigues 1997) which illustrates the fact that these genes influence sensillum type dependent on... 

Insect chemosensory organs have been differentially developed for taste and olfactory sensing. The contact and the distant chemosensory sensilla are responsible for nonvolatile and volatile chemical reception, respectively. The CHCs with long carbon chains are non-volatile, and therefore thought to be received by taste sensilla (Ebbs and Amrein, 2007). However, because of their insolubility in water, it was very difficult to obtain response recordings to them from taste sensilla. Success was recently obtained, however, in Drosophila melanogaster, where a male-specific CHC as a sex-pheromone inhibiting male-male courtship was found to stimulate the bitter taste receptor neuron within the... 

Hartenstein, V. (1988) Development of Drosophila larval sensory organs spatiotemporal pattern of sensory neurones, peripheral axonal pathways and sensilla differentiation. Development 102 869-886. 

MONTEFORTl, G., ANGELI, S., PETACCHI, R., MflMNOCCI, A., Ultrastructural characterization of antennal sensilla and immunocytochemical localization of a chemosensory protein in Carausius morosus Bruenner (Phasmida Phasmatidae), Arthropod Structure and Development, 2002, 30, 195-205. 

DIEHL, P.A., VLIMANT, M., GUERENSTEIN, P., GUERIN, P.M., Ultrastructure and receptor cell responses of the antennal grooved peg sensilla of Triatomainfestans (Hmiptera Reduviidae), Arthropod Structure and Development, 2003, 31, 271-285. 

Male H. galba have about 200 male-specific sensilla on the medial side of both antennulae, each hair being about 150 pm long. These sensilla are innervated by only one to three sensory cells. Female II. galba live inside jellyfish medusa together with their offspring after these have left the female marsupium. The females appear to be inept swimmers and are probably more or less stationary in their medusa. The males are better swimmers and probably use their well-developed chemosensors to find females (Dittrich 1988 Hallberg et al. 1997). 

---