Adelomyrmex longinoi

This species occurs in mature wet forest leaf litter. It is most abundant in the lowlands but can occur as high as 1100 m elevation (Parque Nacional Azul Meambar, Honduras). The northern limit appears to be just across the Motagua fault in southeastern Guatemala. It is widespread in wet forests of Honduras and Nicaragua. In Costa Rica it occurs on both lowland Atlantic and southern Pacific slopes, but only to 500 m elevation. When present it is always a low-density element of the fauna, occurring in 1–10% of miniWinkler samples, and usually as one or two individuals per sample. (Longino 2012)

Identification
In the northern part of its range A. longinoi is sympatric with the closely similar Adelomyrmex marginodus, and the two species may occur together in the same Winkler samples. The anterior and dorsal faces of the pronotum are less sharply differentiated in A. longinoi, and the posterior margin of the postpetiole lacks a pronounced transverse rim. DNA barcoding evidence supports the distinctness of the two species. Fernández (2003) commented on Chiapas specimens tentatively identified as A. longinoi; these are almost certainly A. marginodus. (Longino 2012)

Key to Adelomyrmex of the New World mainland

Distribution based on Regional Taxon Lists
Neotropical Region: Costa Rica, Guatemala, Honduras, Mexico, Nicaragua.

Nomenclature

 *  longinoi. Adelomyrmex longinoi Fernández, 2003b: 21 (w.q.) COSTA RICA.

Type Material
Longino (2012) - The holotype of A. longinoi is currently missing. Queries have not located it at BMNH, IAVH, ICN, INBIO, LACM, MIZA, MZSP, USNM. However, abundant material from the type locality is available in museums, and multiple specimens exist from the same miniWinkler sample.