Dolichoderinae, Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia
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Additional images:
Holotype queen, face and lateral views (above images), mandible (small, large), petiole, lateral view (small, large).
Queen, face view (original line drawing, reduced line drawing), head, lateral view (original line drawing, reduced line drawing), mandible (original line drawing, reduced line drawing), propodeum (original line drawing, reduced line drawing), petiole, lateral view (original line drawing, reduced line drawing).
Worker, face view (original line drawing), mesosoma, lateral view (original line drawing).
Range
Costa Rica: Cordillera de Tilar‡n.
Identification
Queen
Measurements of holotype: HLA 1.62, HLB 1.58, HW 0.98, SL 0.67, EL 0.34, OC 0.07, MTSC 3.
Measurements (n=3): HLA 1.56 (1.53-1.62), HW 0.94 (0.93-0.98), SL 0.67 (0.65-0.67), CI 61 (60-61), SI 42 (42-44).
Palpal formula 5,3; middle and hind tibia with prominent pectinate apical spur; dorsal surface of mandible (excluding masticatory margin and apex) with small piligerous puncta, setae in puncta short, subdecumbent, interspaces between puncta smooth and shiny on apical third of mandible, becoming faintly microareolate on basal two thirds; medial and lateral clypeal lobes at about same level; head rectangular, posterior margin distinctly excised medially; petiolar node short, broadly triangular, blunt; posteroventral petiolar lobe shallow, evenly convex from front to back; scape with sparse erect setae, inconspicuous and only visible at certain angles, about as long as one quarter maximum width of scape; middle and hind tibia with very sparse erect setae, fine, inconspicuous, longest about as long as one fifth maximum width of tibia (MTSC 0-5), side of head with 0-1 short erect setae near mandibular insertion, lacking setae elsewhere, posterior margin of head with sparse short setae; pronotum with posterior row of erect setae, mesoscutum, scutellum and propodeum with sparse erect setae, petiolar node in profile with 2 pairs erect setae projecting above apex, posteroventral lobe with abundant short erect setae; gastral terga with very sparse erect setae; general body color uniformly brown.
Worker
Measurements (n=4): HLA 1.43 (1.15-1.53), HW 1.10 (0.94-1.18), SL 0.68 (0.61-0.70), CI 77 (76-82), SI 47 (46-53).
Palpal formula 5,3; middle and hind tibia with prominent pectinate apical spur; dorsal surface of mandible smooth and shiny on apical third, becoming microareolate and dull on basal two thirds, with abundant small puncta, row of puncta along masticatory margin with setae, others lacking setae; medial and lateral clypeal lobes at about same level; head elongate with weakly convex sides, strongly excavate posterior margin; in lateral profile pronotum shallowly convex, mesonotum more strongly convex and forming separate convexity that protrudes above pronotum; scape with sparse, inconspicuous erect setae, length of setae about one quarter maximum width of scape; mid and hind tibia with 1-5 erect setae, setae inconspicuous, longest about one quarter maximum width of tibia; side of head lacking erect setae; posterior margin of head with sparse short erect setae; pronotum and mesonotum with moderately abundant erect setae, propodeum with 2-3 setae at juncture of dorsal and posterior faces; color brown.
Similar Species
The 5,3 palpal formula, the presence of tibial spurs, and the elongate rectangular head places A. oecocordia among the species treated in Longino (1996). The lack of conspicuous erect setae on the mandibles differentiates it from A. brevis and A. nigricans. The remaining similar species are A. beltii, A. longiceps, and A. pittieri. Queens of A. oecocordia differ from queens of A. beltii in the smaller size and brown color. They differ from A. pittieri in the relatively longer, more rectangular head. They differ from A. longiceps in the more triangular petiolar node, less setose hind tibia, smaller puncta on the mandible, and larger size.
Natural History
This species is only known from one small area in the Monteverde region of Costa Rica, and all collections are from Cordia alliodora. It appears to be a Cordia specialist, like A. pittieri. Its behavior appears similar to A. pittieri in all respects. Founding queens are found in Cordia nodes. Mature colonies dominate most nodes of a tree, but may coexist with Cephalotes setulifer on the same tree. Individual nodes usually contain coccoid Hemiptera on the interior walls, and the ants build small carton partitions inside the nodes.
Comments
This species was referred to as Azteca JTL-003 in Longino (1996).
Page author:
John T. Longino, The Evergreen State College, Olympia WA 98505 USA. longinoj@evergreen.edu
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