Mycetosoritis

Mycetosoritis can be distinguished from other lower attine genera by the characteristic turriform (turret-like) mounds of excavated sand at nest entrances, measuring 3–8 cm in diameter and 2–4 cm in height. These mounds are most conspicuous in spring and become less visible later in the season. The genus is placed in Attini based on fungal cultivation behavior and associated morphological traits.

Exclusively sandy soils in sun-exposed areas. Nests occur in semi-open pine-oak forest clearings, white-sandy areas within pine-oak woodlands, and grassy savannas. The species is difficult to locate under leaf litter in forested areas.

Southern United States (Louisiana, Texas), eastern Mexico to at least Honduras. Mycetosoritis vinsoni, described from northwestern Costa Rica, may be conspecific with M. hartmanni, which would extend the range further south.

Foraging activity occurs primarily between April and October, with reduced activity from November through February. In central Texas, egg laying resumes in April, first worker pupae appear in early June, and reproductives are reared primarily in July and August.

Obligate fungal mutualism. Ants cultivate fungi in underground garden chambers and feed on the cultivated fungus.

Colonies are monogynous with typically fewer than 100 workers (average 47.6, maximum 148). Nests contain 1–3 underground garden chambers arranged along a vertical tunnel, with the deepest gardens 50–70 cm deep. Annual cycle: reduced winter activity, spring egg laying, summer production of reproductives with protogyny (proportionally more females produced early in summer). Mating flights and nest founding by mated females occur from late June through August, possibly extending to September.

Constructs characteristic steep, turriform excavation craters at nest entrances. Seasonal excavation activity peaks in spring, making mounds most conspicuous in April–May. Foraging is primarily diurnal. Workers are observed on mounds throughout much of the day during spring.

Fungus-growing ant engaging in obligate mutualism with cultivated fungi. Locally abundant in suitable sandy habitats. Population abundance appears relatively unaffected by invasive fire ants.

Not currently considered endangered. Presence can indicate suitable sandy soil habitats. No documented economic importance.

• Other lower Attini genera (e.g., Cyphomyrmex, Mycocepurus, Myrmicocrypta)Also cultivate fungi in underground gardens, but lack the characteristic turriform sand mounds of Mycetosoritis; nest architecture differs
• Mycetosoritis hartmanni vs. M. vinsoniMay be conspecific based on morphological similarity; M. vinsoni described from Costa Rica but potentially represents the same species as M. hartmanni

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Life history, nest longevity, sex ratio, and nest architecture of the fungus-growing ant Mycetosoritis hartmanni (Formicidae: Attina)