Mayriella Forel ^HNS, 1902

Taxonomy. The genus Mayriella ^HNS was established under the tribe Meranoplini ^HNS by Forel (1902), but was placed in the Carebara ^HNS genus group of the tribe Solenopsidini ^HNS by Bolton (2003). The genus was recently revised by Shattuck & Barnett (2007). The worker of the single known Vietnamese species has the following features.

Worker monomorphic; head in full-face view subtrapezoidal; frontal lobe large; antennal scrobe very deep, surrounded dorsally by frontal carina and ventrally by genal carina; both carinae well developed and meeting at posterior end of antennal scrobe; median portion of clypeus behind anterior margin vertical or nearly vertical, terminating above in a projecting, bidentate appendage; median clypeal seta absent; posteromedian portion of clypeus inserted relatively broadly between frontal lobes; mandible with 4 teeth; antenna 10-segmented, with 2-segmented club; eye large and elongated, narrowed anteroventrally; mesosoma short and high; promesonotal dome flattened, slightly higher than anterior border of propodeal dorsum; humerus bluntly expanded anterolaterad; promesonotal suture absent dorsally; ventrolateral margin of promesonotum and anterior margin of mesopleuron forming flanges partly overhanging forecoxa; metanotal groove shallowly impressed dorsally; dorsum of propodeum declining posteriorly; propodeal spine elongate-triangular; propodeal lobe strongly expanded posterodorsad; petiole short but pedunculate, with high node; subpetiolar process well developed; postpetiole short; gastral shoulder well developed; dorsa of head and mesosoma with sparse, long, standing hairs.

The worker of Mayriella ^HNS is somewhat similar to that of the Vietnamese species of Calyptomyrmex ^HNS (for distinguishing features see notes under Calyptomyrmex ^HNS).

Vietnamese species. Only one species has been described from Vietnam: granulata Dlussky & Radchenko ^HNS [= sp. eg-1; = sp. 1 of SKY: Yamane et al. 2005] (type locality: Bai Tu Long; other localities: Ba Be, Cuc Phuong, Phu Quoc, Tay Yen Tu, Van Ban).

Bionomics. Nests of M. granulata ^HNS are found in rotting twigs, under stones and in the litter layer.