Fig. 2 in A Phylogenetic Analysis of the Dirt Ants, Basiceros (Formicidae: Myrmicinae): Inferring Life Histories Through Morphological Convergence

Fig. 2. Dorsal view of the labrum (dorsolabrum) of the worker caste of Basiceros species, dtg: dorsal transverse groove, lo: lateral lobe. (A) B. conjugans; (B) B. convexiceps; (C) B. disciger; (D) B. militaris; (E) B. scambognathus; (F) B. singularis (CASENT063735); (G) B. manni; (H) Basiceros sp. n. A, dashed line: tentative reconstruction of posterolabral limits. Crossed arrows give the orientation: a, anterior; p, posterior. Scale bar: 0.1 mm. Labrum shape in Basiceros can be long triangular and sinuate (A, C, D), long triangular and acute (B, H), triangular short (E) or (F, G) lunate. For the distal margin of labrum lobes can have a wide (C) or narrow clef (A, B, D, H), can be blunt with a short cleft (E) or rounded (F, G).