Structure and distribution of antennal sensilla in Oranmorpha guerinii (Gervais, 1837) (Diplopoda, Polydesmida)

• SEM investigations on the antenna of Oranmorpha guerinii revealed the presence of 6 sensillar types.
• Available data on diplopod antennal sensilla are compared and discussed.
• We propose a standardized terminology of antennal sensillar structures.

Detailed information on sensory organs of Diplopoda especially on antennal sensilla are still sparse and fragmentary. The present study on the antennae of Oranmorpha guerinii (Polydesmida, Paradoxosomatidae) utilizing scanning electron microscopy revealed the presence of six sensillar types: (1) apical cones, (2) sensilla trichodea, (3) sensilla microtrichodea, (4) sensilla chaetica, (5) sensilla basiconica bacilliformia, and (6) sensilla basiconica spiniformia. External structure and distribution of cuticular antennal sensilla are compared with data from other diplopod species. We moreover discuss possible functions of antennal sensilla in millipedes.