Azteca gnava Forel

Longino, J. T., 2007, A taxonomic review of the genus Azteca (Hymenoptera: Formicidae) in Costa Rica and a global revision of the aurita group., Zootaxa 1491, pp. 1-63 : 34-35

publication ID

https://doi.org/10.5281/zenodo.6246514

publication LSID

lsid:zoobank.org:pub:C31A1226-724D-4D1A-8471-E6BB441EE3EF

DOI

https://doi.org/10.5281/zenodo.6246514

persistent identifier

https://treatment.plazi.org/id/62A84861-CB41-250A-A640-25E2DB8C9D15

treatment provided by

Thomas

scientific name

Azteca gnava Forel
status

 

Azteca gnava Forel   HNS 1906

Figures 3,4A,5,6E,6F.

Azteca paraensis subsp. gnava Forel   HNS 1906:241. Syntype workers: Costa Rica (Biolley) (in an abandoned termite nest) ; and " Surubrés, touffe d'orchidée, dans un nid de termites"; and " San Mateo , racines de goyavier (le meme)" [ MHNG] (examined, one Costa Rica (Biolley) worker here designated LECTOTYPE).

Azteca paraensis subsp. gnava var. surubrensis Forel   HNS 1908a:62 (unavailable name). Syntype workers: Costa Rica, Surubres and El Hiquito near San Mateo (Biolley), dans des racines de goyaviers [ MHNG] (examined).

Azteca gnava Forel   HNS ; Forel 1912:49.

Azteca gnava surubrensis Forel   HNS 1912:49 (first available use of surubrensis Forel   HNS 1908) [MHNG] (examined). NEW SYNONYMY

Azteca ulei subsp. rossi Forel   HNS 1909:251. Syntype workers: Mexico, amongst orchids in antgarden (Ross) [ MHNG] (examined). NEW SYNONYMY

Queen characters. Measurements (n=5): HLA 2.19 (2.18-2.20), HW 2.37 (2.33-2.47), SL 1.14 (1.11-1.20), CI 108 (107-113), SI 52 (50-55).

Palpal formula 6,4; ocelli small; middle and hind tibia with prominent pectinate apical spur; dorsal surface of mandible with abundant piligerous puncta, setae in puncta a combination of longer erect setae and shorter subdecumbent setae, interspaces between puncta faintly microareolate with varying development of roughened, acicular sculpture; medial and lateral clypeal lobes at about same level; head with convex sides, posterior margin strongly cordate; petiolar node in lateral view varying from triangular to flattened and scale-like at apex; posteroventral lobe of petiole deep, with posterior margin forming a concave or vertical surface, meeting tergum anterior to posterior limit of posterior tergal lobe (Fig. 1D, 5); scape with abundant erect setae, about as long as one half to two thirds maximum width of scape; middle and hind tibia with abundant erect setae, longest of these about as long as one half maximum width of tibia (MTSC 20-40); side of head with 0- 1 erect setae near mandibular insertion, lacking elsewhere; posterior margin of head with abundant long erect setae; pronotum with erect setae on anterior margin and posterior margin, leaving bare space medially; mesoscutum, scutellum, and propodeum with abundant erect setae; petiolar node rimmed with erect pubescence and irregular longer erect setae, 2-3 pairs of erect setae usually extending above apex in profile, posterior border of sternal lobe of petiole with dense layer of erect setae of irregular lengths; gastral terga with moderately abundant long erect setae; almost entire body uniform dark red brown, lighter orange brown around antennal fossa.

Worker characters. Measurements (n=14): HLA 1.24 (1.00-1.44), HW 1.29 (1.01-1.47), SL 0.94 (0.81- 1.01), CI 105 (101-109), SI 77 (70-85).

Palpal formula 6,4; middle and hind tibia with prominent pectinate apical spur; dorsal surface of mandible smooth and shining near masticatory margin, grading to microareolate and dull at base, with moderately abundant small piligerous puncta, setae in puncta short, erect, larger puncta with long setae near masticatory margin; medial and lateral clypeal lobes at about same level; head with strongly convex sides, strongly cordate posterior margin; in lateral profile pronotum evenly sloping, slightly convex, mesonotum more strongly convex, forming separate convexity; posteroventral lobe of petiole well developed, deep; scape with abundant erect setae, length of setae about one half to equal to maximum width of scape; mid and hind tibia with abundant erect setae, longest setae about one half to two thirds maximum width of tibia; side of head with 2-5 erect setae irregularly distributed along side; posterior margin of head with abundant long erect setae; pronotum, mesonotum, and dorsal face of propodeum with abundant long setae, those on dorsal face of propodeum sometimes shorter, sparser, less erect than those on pronotum and mesonotum; most of body light to dark brown.

Similar species. The queens of A. gnava   HNS are most similar in size and shape to queens of A. instabilis   HNS and A. sericeasur   HNS . They differ from A. instabilis   HNS by the small ocelli (OCW <0.15 for A. gnava   HNS ,> 0.20 for A. instabilis   HNS ), and from A. sericeasur   HNS by the uniformly brown face (with extensive yellow coloration on A. sericeasur   HNS ). Azteca gnava   HNS differs from both species in the deep posteroventral petiolar lobe, with vertical to concave posterior face. Workers of A. gnava   HNS are difficult to distinguish from A. velox   HNS and A. nigra   HNS . They tend to be somewhat larger than both. The ventral petiolar lobe is more strongly developed than A. velox   HNS , and the scapes tend to be relatively shorter than A. nigra   HNS (Fig. 6F).

Range. Southern Mexico to Panama.

Biology. Azteca gnava   HNS occurs in the canopy of wet to moist forest habitats, where it forms ant gardens. Ant gardens are moderately abundant in Costa Rica, usually in the canopy of wet to moist forest, and often in trees overhanging streams or river margins. Costa Rican ant gardens are formed by a number of species, including Odontomachus panamensis   HNS (in parabiotic association with Crematogaster carinata   HNS ), C. jardinero   HNS , C. longispina   HNS , Pheidole violacea   HNS , Azteca gnava   HNS , and A. nigra   HNS .

Azteca gnava   HNS ant gardens are large and their associated epiphytes usually appear dense and well established(e.g. robust Aechmea (Bromeliaceae) plants, dense mats of Peperomia (Piperaceae), hemiepiphytic Coussapoa ). In Corcovado National Park, Costa Rica, A. gnava   HNS ant gardens often have abundant growth of Peperomia macrostachya and Aechmea tillandsioides var. kienastii . Colonies usually occur as one or more large central nests and numerous smaller satellite nests, forming an "archipelago" of ant gardens. Larger nests may be over 50cm diameter. Invariably, large populations of coccoid Hemiptera are sheltered beneath the ant gardens, attached to the supporting branch of the host tree and sometimes on the epiphytes on the nest. Ant brood can be found dispersed throughout the gardens.

Queens were unknown prior to this study and they are very rarely encountered. In the one case in which I observed a colony queen, it inhabited the central and largest ant garden. Very occasionally alate queens are taken in Malaise traps. On Barro Colorado Island, Panama, I collected an alate queen flying in the forest at 1700hrs.

Comments. Azteca gnava   HNS may be close to or the same as A. ulei   HNS , the ants from Ule's classic studies of Amazonian ant gardens (Ule 1901).

Additional material examined. COSTA RICA: Alajuela: Atenas , Nov 1977 (L. D. Gómez P.) - workers[ USNM] ; Heredia: 11km ESE La Virgen , 10°21'N, 84°03'W, 300m , Feb - Apr 2004 (ALAS) - alate queen GoogleMaps ; Limon: Hamburg Farm , 10°15'N, 83°27'W, 50m , 28 Nov 1925 (F. Nevermann) - workers [ USNM] GoogleMaps ; Tortuguero , 10°32'N, 83°31'W, 5m , 5 Jul 1985 (J. Longino) - workers, dealate queen GoogleMaps ; 10km ESE Moravia , 9°48'N, 83°22'W, 500m , 28 Aug 1985 (J. Longino) - workers GoogleMaps ; Hitoy Cerere Biol. Reserve , 9°40'N, 83°02'W, 100m , 1 Sep 1985 (J. Longino) - workers GoogleMaps ; Puntarenas: Sirena, Corcovado National Park , 8°29'N, 83°36'W, 5m , multiple collections and dates (J. Longino) - workers GoogleMaps ; same locality, 1- 30 Apr 1992 (G. Rodriguez) - alate queen [ INBC] GoogleMaps ; Llorona, Corcovado National Park , 8°35'N, 83°42'W, 5m , 8 Jun 1982 (J. Longino) - workers GoogleMaps ; Rio Nino , Corcovado National Park , 8°33'N, 83°29'W, 300m , 11 Feb 1996 (J. Longino) - workers, males GoogleMaps ; 5km SW Las Alturas , 8°55'N, 82°52'W, 1240m , 24 Mar 1990 (J. Longino) - worker (tentative determination) GoogleMaps ; 19km S Ciudad Neily , 8°29'N, 82°58'W, 20m , 25 Mar 1990 (J. Longino) - workers, male GoogleMaps ; Rancho Quemado, Osa Peninsula , 8°42'N, 83°33'W, 200m , 1- 30 Nov 1991 (F. Quesada) - alate queen [ INBC] GoogleMaps ; same locality, 1- 30 Apr 1992 (K. F. Flores) - alate queen [ INBC] GoogleMaps ; GUATEMALA: Izabal: Livingston , 15°50'N, 88°45'W (Schwarz & Barber) - alate queen [ USNM] GoogleMaps ; HONDURAS: Comayagua: 1mi W. Taulabe , 1990 (C. Catton) - worker ; PANAMA: Canal Zone: Barro Colorado Island , 9°09'N, 79°51'W, 100m , 4 Jul 1997 (J. Longino) - alate queen GoogleMaps .

MHNG

Switzerland, Geneva, Museum d'Histoire Naturelle

USNM

USA, Washington D.C., National Museum of Natural History, [formerly, United States National Museum]

INBC

Costa Rica, Santo Domingo de Heredia, Instituto Nacional de Biodiversidad (INBio)

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Formicidae

Genus

Azteca