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Extant: 1 valid species
Diagnosis (worker). Monomorphic ants belonging to the subfamily MyrmicinaeHNS. Palp formula 3,2 (in situ). Anterior clypeal border broadly convex. Clypeus broad, evenly rounded, devoid of carinae and broadly inserted between the widely separated frontal lobes. Row of hairs on the anterior clypeal margin, including median seta. Tentorial pits inserted midway in the clypeal margin. Antennal scrobe absent. Antenna with 2-segmented club. In lateral view, promesonotum strongly convex. In dorsal view the promesonotum triangular, with sides well defined. Propodeal spiracles conspicuous, situated on the dorsal edge of declivous face of propodeum, breaking the propodeal outline in lateral view. Propodeum unarmed. Propodeal lobes small and rounded, not linked by a dorsal carina.
FIGURE 1. Diaphoromyrma sofiaeHNS, n. gen. & n. sp. Automontage pictures, paratype worker. A: Head in full face view; B: Clypeal area of head; C. Body in lateral view; D. Body in dorsal view. Pictures taken by April Nobile (CASC).
FIGURE 2. Diaphoromyrma sofiaeHNS, n. gen. & n. sp. SEM pictures, paratype worker. A: Clypeus and mandibles in full face view; B: Propodeum, petiole and postpetiole in dorsal oblique view; C. Petiole and postpetiole in lateral view; D. Petiole, postpetiole and first gastral segment in dorsal view. E. Gaster in ventral view.
Petiolar node high in relation to the postpetiolar node, narrow (in dorsal view) in contrast with the broader, postpetiole node. Postpetiole attached low on the gaster, so the top of the first gastral tergum at about the same level as the postpetiole. Abdominal sternite 4 (first gastral) with a pair of rounded recurved anterolateral extensions which curve up on to the dorsal surface of the segment, and are visible in dorsal view on either side of the postpetiole.
Comments. The combination of the following traits differentiate this taxon from any other in the subfamily MyrmicinaeHNS: antenna 9-segmented with a 2-segmented club, clypeus broad, clypeus with central apical hair, promesonotum trapezoidal, propodeal spiracles situated on lateral propodeal edges. The low position of the postpetiole and the sternal configuration of the first gastric segment are unique in MyrmicinaeHNS and apomorphic for the genus.
Etymology. DiaphoromyrmaHNS is a neologism forged from the Greek words [[...]] (diaphoros), meaning different or remarkable, and [[...]] (myrmekos), ant. This name alludes to the several traits that differentiate this genus from any other MyrmicinaeHNS, especially those relative to the gaster.