Sensilla Placodea Research Articles

Occurrence of a new type of mosaicism inApis mellifera

A mixture of tissue with male and female olfactory plates (sensilla placodea) was observed in the antennal segments number 8, 9 and 10 of a gynandromorphic honeybee obtained by radiation from a Co60 source.

Ultrastructural Morphology of two Sensilla Placodea on the Antenna of a Parasitic Wasp

Females of the wasp Tetrastichus hagenowii (Hymenoptera: Chalcidoidea) lay their eggs in cockroach egg cases, the young hatch and feed on the cockroach eggs. Prior to egg deposition the parasites follow a complex behavioral sequence, including tapping their antennal tips on the eggcase, thus enabling them to detect various mechanical and chemical properties of the cockroach egg case and determine its suitability for oviposition (unpublished data).Sensory sensilla occur along the entire length of the female antenna (Fig. 1). Two of the more prominent sensilla were studied by scanning and transmission electron microscopy, these are both sensilla placodea (PI and P2 in Figs. 1 and 2) which are chemoreceptors (1). Numerous hair-like sensilla (H) and a few bulb-like sensilla (B) are also present (Figs. 1 and 2). Sensilla placodea occur frequently on hymenopteran antennae (1), but the occurrence of two types on the same insect has not been reported previously.

Sensory Structures on the Venom Apparatus of a Primitive Ant Species1

Mechanoreceptors and chemoreceptors are found primarily at 8 distinct locations in the venom apparatus of Paraponera clavata . Receptors are in the form variously arranged sensilla campaniformia, placodea, trichodea and basiconica and apparently function in sting manipulation and detection of a victim.