Discothyrea damato

Discothyrea damato is only known from Kenya, Rwanda, and Uganda where it occurs in forested areas at comparatively high elevations ranging from 1448 to 2200 m. Based on data from material sampled in Kenya and Uganda, D. damato lives in leaf litter.

Identification
The following character combination distinguishes D. damato from the remainder of the complex:
 * masticatory margin of mandible edentate
 * frontal lamella with conspicuous, large, elliptical basal fenestra
 * anterolateral corner of gena not denticulate/dentate
 * eyes absent to tiny (OI 0–4)
 * in dorsal view mesosoma conspicuously thick, robust and stocky (DMI 59–66; DMI2 95–102)
 * in profile mesosoma not extremely convex and propodeum angulate to dentate
 * mesotibia without apicoventral spur
 * AT4 around 1.2 times longer than AT3 (ASI 117–128)
 * abdominal sternite 3 without any projecting lobe
 * anterior clypeal margin without conspicuous row of long, straight setae
 * dorsal surfaces of mesosoma, petiole, and gaster without standing pilosity

Distribution based on Regional Taxon Lists
Afrotropical Region: Democratic Republic of Congo, Kenya, Rwanda, Uganda.

Nomenclature

 *  damato. Discothyrea damato Hita-Garcia & Lieberman et al., 2019: 37, figs. 4F, 6F, 7F, 8F, 9F, 10F, 11F, 12F, 14F, 29, 30 (w.) UGANDA.

Description
Head subrectangular, longer than broad (CI 79–85), posterior head margin flat to gently convex, with very weak impression medially; posterodorsal corners of head quite broadly rounded; in frontal view, sides of head weakly convex; eyes absent or extremely minute (OI 0–4), if present, tiny, pigmented spot situated about one-third of way between anterolateral corner of gena and posterior head margin, usually not visible in frontal view; frontal lamella rounded-triangular in profile; lamella with very conspicuous, large, elliptical basal fenestra; medial clypeus convex, lateral clypeus strongly curving between antennal sockets and anterolateral corners of head, sides of medial clypeus nearly parallel laterad antennal sockets, bearing very short curved setae. Antenna with scape of short to intermediate length (SI 51–62), scape clearly incrassate, gently bent; pedicel subcylindrical, broader than long; true antennomere count nine; apparent antennomere count eight to eleven; flagellomeres basad apical club highly compressed, taken together shorter than apical club. Ventral head with narrow, roughly V-shaped postoccipital ridge without anteromedian carina; median region of hypostoma triangular, arms narrowed and slightly spatulate apicolaterally; palpal formula not examined.

Mandible edentate except for small, sharp prebasal denticle; basal angle rounded; ectal face with longitudinal carina nearly confluent with masticatory margin for almost its entire length, leaving very narrow depressed masticatory strip including prebasal denticle.

Mesosoma in profile moderately high and relatively flat, pronotum significantly lower than propodeum, propodeum strongly angulate to dentate, posterolaterally conspicuously concave; in dorsal view mesosoma conspicuously thick, robust and stocky (DMI 59–66; DMI2 95–102), strongly narrowed posteriorly, pronotum much wider than propodeum; pronotal humeri rounded; posterior propodeal margin distinctly concave; propodeal spiracle directed posterolaterally; propodeal lobes well developed, lobate.

Legs short to moderately long (HFI 54–61) and slender; mesotibia without apicoventral spur or seta; mesobasitarsus relatively short, about as long as tarsomeres II–IV taken together.

Petiolar node moderately attenuated dorsally, about 2.4 to 3.1 times higher than long (LPeI 243–314); in profile, anterior face of node convex, apex peaked, posterior face sloping posteroventrally; in dorsal view, petiole subrectangular, sides diverging posteriorly, about 2.3 to 2.9 times as broad as long (DPeI 233–286); in anterior view, petiolar outline clearly pentagonal with somewhat rounded but well-defined angles, strongly peaked; in oblique anterior view, anterior face flat; in ventral view, roughly rectangular sides weakly diverging posteriorly; subpetiolar process comparatively long, lobate, apex rounded, and directed anteroventrally; petiolar spiracles large, elliptical to weakly reniform in ventral view.

Abdominal segment 3 campaniform, widest point just anterad end of segment; sternite more or less evenly convex in profile; AS3 with weak medial carina posteriorly broadening into a swollen lobe at around the sternite’s midline; AS3 without carinate prora, but still with anterior face distinctly depressed and anterior margin of ventral face arcuate in ventral view; AT4 hemidemispherical and around 1.2 to 1.3 times as long as AT3 (ASI 117–128); AS4 well-developed and broad, overlapping most of the width of AS3, anterior margin straight to weakly convex in ventral view; successive abdominal segments short, telescopic, often concealed, projecting strongly anteriorly.

Sculpture of mandible punctulate, moderately shiny; ventral head surface foveolate to punctulate; remainder of head, dorsal mesosoma, lateral petiole, and abdominal segment 3 conspicuously but shallowly foveolate-reticulate to weakly areolate, sculpture on lateral mesosoma less regular, reticulum becoming rugulose, area around propodeal spiracle smoother and shiny; declivitous face of propodeum predominantly finely reticulate-punctate; anterior and dorsal petiole relatively weakly sculptured, rugulose-reticulate to granulate; AT4 finely punctulate.

Setation generally very fine, dense, mostly appressed, very short pubescence; ectal face of mandible with moderately long, curved, subdecumbent to suberect setae; masticatory margin with row of short straight setae; abdominal segments 5 to 7 with moderately short standing setae.

Color usually uniformly orange brown to chestnut brown, with appendages of lighter color.

References based on Global Ant Biodiversity Informatics

 * Hita-Garcia F., Z. Lieberman, T. L. Audisio, C. Liu, and E. P. Economo. 2019. Revision of the highly specialized ant genus Discothyrea (Hymenoptera: Formicidae) in the Afrotropics with X-ray microtomography and 3D cybertaxonomy. Insect Systematics and Diversity 3(6): 5:1-84.