FIGURE 2 in Transitional morphology and Afrotropical affinity of a bythinoplectine rove beetle from the early Eocene of India (Coleoptera: Staphylinidae: Pselaphinae)

FIGURE 2. Cephalic morphology of Zethinus-group Bythinoplectini. A, B, Zethinus leleupi males (Democratic Republic of Congo: Mabali). C, D, Zethinus sp. nov. male (Democratic Republic of Congo: Kinshasa). A, Dorsal head and cephalic appendages of Zethinus showing antennae mounted under the frontal rostrum, either side of which are large excavations that extend posteriorly to the anterior margins of the eyes. Tightly appressed antennomeres 7 and 8 together form an ovoid antennal club; arrowheads indicate the boundary between these antennomeres—the "sillon annulaire" sensu Coulon, 1989. MP: left maxillary palp. B, Frontal view of Zethinus head showing retracted maxillary palpi inside excavations lateral to frontal rostrum. C, Head of Zethinus in lateral view with maxillary palp retracted into excavation. D, Maxillary palp of Zethinus showing diagnostic Bythinoplectini Section V morphology with narrow, elongate, apically globose tubercles on palpomeres III and IV. Prominent apical pseudosegment (APs) is indicated.