Adelomyrmex marginodus Longino, sp. nov.
Creators: name: Longino, John T.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Adelomyrmex
Adelomyrmex marginodus

description: Adelomyrmex marginodus Longino, sp. nov.
(Figs 3, 16, 21)
Type material. Holotype worker Honduras, Atlántida: 7 km SSW Tela, 15.72337 −87.45177 ± 20 m, 190 m, 15 Jun 2010 (LLAMA Wa-C- 08-2-43) [CAS, unique specimen identifier CASENT 0627826]. Paratypes (workers): Honduras, Atlántida: 7 km SSW Tela, 15.72453 −87.45192 ± 20 m, 190 m, 15 Jun 2010 (LLAMA Wa-C- 08-2-17) [MCZC, CASENT 0618409]; Honduras, Atlántida: 12km SW La Ceiba, 15.69130 −86.86076 ± 20 m, 280 m, 19 Jun 2010 (LLAMA Wa-C- 09-2-17) [BMNH, CASENT 0627830], [EAPZ, CASENT 0627831], [ECOSCE, CASENT 0627832], [MZSP, CASENT 0627828], [UCD, CASENT 0627833], [USNM, CASENT 0627829]; same data but 15.69116 −86.86075 ± 20 m (LLAMA Wa-C- 09-2-20) [ICN, CASENT 0627834].
Geographic range. southern Mexico, Guatemala, Honduras, Nicaragua.
Diagnosis. Differing from the similar A. longinoi in (1) more sharply differentiated anterior and dorsal face of pronotum in profile; and (2) posterior margin of postpetiole with sharp projecting transverse rim.
Description. Worker. HW 0.44–0.50 (n=5); mandible with differentiated masticatory and basal margins; masticatory margin with 5 teeth; basal margin sinuous with a distinct basal tooth and notch between tooth and condyle; dorsal surface of mandible with several coarse longitudinal striae and several large piligerous puncta; in full face view, lateral clypeal teeth small but still projecting from beneath clypeal shelf; lateral clypeal teeth located on anterior (ventral) margin of clypeus and separate from transverse carina that forms clypeal shelf; hypostomal tooth a minute triangular denticle; compound eye composed of 1–4 ommatidia; face coarsely reticulate rugose, with weak longitudinal orientation.
Short anterior face of pronotum meeting dorsal face at nearly right angle, separated by a low, simple transverse ruga; promesonotum evenly and very shallowly convex; metanotal groove weakly impressed; propodeal spines pronounced, triangular, acute at tip; space between propodeal spines a broad concavity without distinct dorsal and posterior faces, smooth and shiny with a moderately strong transverse ruga between propodeal spines, a few weaker rugulae above it; sculpture of dorsal promesonotum and side of mesosoma reticulate rugose like face; petiolar node relatively tall with differentiated anterior, dorsal, and posterior faces, rugose; postpetiolar node low and rounded, rugose laterally, smooth and shiny dorsally; in profile, postpetiolar node with a pronounced posteroventral rim; postpetiole in dorsal view about as long as wide, evenly rounded posteriorly; gastral dorsum smooth and shining.
Scape with abundant subdecumbent pubescence, and with two long suberect setae that are differentiated from the pubescence and project above it; clypeus and frontal carinae with long erect setae; posterior and posterolateral margins of head with long erect setae; mid and hind tibia with abundant long subdecumbent setae and 2–3 differentiated erect setae that are longer than width of tibia; in profile, dorsal surfaces of head, mesosoma, and gaster with relatively short, dense subdecumbent setae; FSH about 0.03, FSI 0.06.
Head and mesosoma red, gaster lighter yellow red.
Queen. Similar to worker except for queen-specific characters of large compound eyes, ocelli, and enlarged mesosoma with queen-typical sclerites; pronotum weakly reticulate rugose medially, coarsely reticulate rugose laterally; dorsal mesonotum smooth and shiny medially, grading into concentric rugulae peripherally; scutellum more coarsely reticulate rugose; katepisternum, anepisternum, and side of propodeum rugose, rugae somewhat more longitudinally oriented than on lateral pronotum.
Biology. This species is known from lowland rainforest sites, from sea level to 400 m elevation. All records are from Winkler samples of sifted litter. It is typically rare, but at one Honduran site it occurred in 17% of miniWinkler samples.
Comments. This species is very similar to A. longinoi. Character differences are subtle yet consistent across a broad zone of sympatry in Guatemala, Honduras, and Nicaragua. See further discussion under A. longinoi.
Etymology. Referring to the posterior rim of the postpetiole.
description: Published as part of Longino, John T., 2012, A review of the ant genus Adelomyrmex Emery 1897 (Hymenoptera, Formicidae) in Central America, pp. 1-35 in Zootaxa 3456 on pages 20-22, DOI: 10.5281/zenodo.282199