Unixenus Jones, 1944

Huynh, Cuong, 2018, Two new species of penicillate millipedes (Diplopoda, Polyxenidae) from Phu Quoc Island in southern Vietnam, Zootaxa 4402 (2), pp. 283-302 : 285

Genus Unixenus Jones, 1944

Monoxenus Jones, 1937: 138 ; Silvestri 1948: 216.

Unixenus Jones, 1944: 94 ; Nguyen Duy-Jacquemin and Condé 1967: 68.

Type species: Unixenus padmanabhai ( Jones, 1937)

Diagnosis. Body with 10 segments, 9 pleural projections and a telson, 13 pairs of legs. Eight ommatidia in each eye; 8 antennal articles with the article VI longest and the article VIII shortest with 4 sensory cones present. Antennal article VI commonly with 1 setiform sensillum between 2 thick bacilliform sensilla, and 1 conical sensillum posteriorly. Anterior surface of labrum covered with spherical papillae gradually reducing in size posteriorly. Lateral palp of gnathochilarium 1.5–2.5 times longer than medial palp, 20–22 sensilla on medial palp and 13 on lateral palp. Two or more rows of tergal trichomes arranged in two latero-posterior clusters either side of the midline, with a central gap. Anterior row often uneven, intermediate rows rarely in defined rows and posterior row of trichomes continuous or with a medial gap. Tarsus 2 with a setiform seta. A single caudal bundle containing caudal trichomes with 1–11 hooks.