Morphology,ultrastructure and distribution of sensilla on the cephalic appendages of Myrmeleon ferrugineipennis observed with a scanning electron microscope

In order to further investigate the feeding mechanism of Myrmeleon ferrugineipennis Bao Wang,the morphology,ultrastructure and distribution of sensilla on the antenna and mouthparts of M.ferrugineipennis adults were observed with a scanning electron microscope.Ten types of antennal sensilla were observed;sensillum trichodea,sensillum basiconca,sensillum chaetica,sensillum cavity,sensillum ligulate,sensillum disk,sensillum branchia,sensillum auricillica,sensillum campaniformia and Bhm bristles.Of these,sensillum trichodea (including three subtypes) were the most common.Sensillum auricillica,sensillum cavity and sensillum campaniformia were only seen on females whereas sensillum ligulate and sensillum branchia were only seen on males.The sensillum disk was discovered at the near end of the flagella of both males and females,but its shape and location differed between the sexes.This is the first observation of sensillum branchia and the sensillum disk in this species.The sensillum basiconca were discovered on the maxillary and labial palps,with more on the labial than on the maxillary palp.Sensillum campaniformia was also discovered on the maxillary palps.