Azteca sericeasur, Longino, J. T., 2007

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 : 46-48

publication ID

https://doi.org/10.5281/zenodo.6246540

publication LSID

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

DOI

https://doi.org/10.5281/zenodo.6246540

persistent identifier

https://treatment.plazi.org/id/431358CA-ECCE-0833-C6AB-79289BD0B271

treatment provided by

Thomas

scientific name

Azteca sericeasur
status

new species

Azteca sericeasur   HNS new species

Figures 3,4A,5,6E,6F,7.

Holotype alate queen: Costa Rica, Prov. Limón, Hamburg Farm [10°15'N, 83°27'W], 50m , 11 Jul 1925 (F. Nevermann) [ USNM, specimen (pin) code JTLC000005642 ]. GoogleMaps

Paratypes: same data as holotype; 2 workers [ JTLC000005642 , USNM]; GoogleMaps alate queen, worker, male [ JTLC000005643 , MCZC]; GoogleMaps alate queen, 2 workers [ JTLC000009416 , INBC]; GoogleMaps 2 workers, 1 male [ JTLC000009415 , LACM]; GoogleMaps 8 workers [ JTLC000009412 , JTLC000009413 , JTLC000009414 , USNM]; GoogleMaps 3 workers [ JTLC000009405 , JTLC] GoogleMaps .

Measurements of holotype. HLA 2.14, HW 2.13, SL 1.335, EL 0.518, OC 0.102, MTSC 30.

Diagnosis. The shape and size of the queen head distinguishes this species from all others except A. sericea   HNS . It differs from A. sericea   HNS in the presence of erect setae on the posterior margin of the head. It is very similar to A. velox   HNS , differing only in the larger size. Azteca gnava   HNS and A. instabilis   HNS are similar but larger. Azteca gnava   HNS has the head solid dark brown; A. sericeasur   HNS has much of the anterior and lateral head light orange brown. Azteca instabilis   HNS has large ocelli (OCW> 0.20mm); A. sericeasur   HNS has small ocelli (OCW about 0.10mm).

Queen characters. Measurements (n=10): HLA 2.00 (1.94-2.14), HW 2.00 (1.94-2.17), SL 1.31 (1.28- 1.39), CI 100 (99-104), SI 66 (62-67).

Palpal formula 6,4; ocelli small; middle and hind tibia with prominent pectinate apical spur; dorsal surface of mandible with small piligerous puncta, setae in puncta short, subdecumbent, interspaces between puncta smooth and shiny on apical half of mandible, gradually becoming faintly microareolate at base; medial and lateral clypeal lobes at about same level; head broadly cordate with rounded sides; petiolar node tall, strongly compressed into thin scale at apex; posteroventral petiolar lobe evenly convex from front to back; scape with abundant erect setae, about as long as one half maximum width of scape; middle and hind tibia with abundant erect setae, longest of these about as long as one third to one half maximum width of tibia (MTSC 20-30); sides of head without erect setae; posterior margin of head with abundant erect setae; pronotum with erect setae on posterior margin; mesoscutum, scutellum, and propodeum with abundant erect setae; petiolar node with rim of dense erect whitish pubescence, sparse longer setae, one pair extending above apex in profile, posterior border of sternal lobe of petiole with dense layer of long erect pubescence and several erect setae that are about twice as long as pubescence; gastral terga with sparse long erect setae; light orange brown coloration on clypeus, malar area, antennal fossa, and side of head, variable extent of infuscation on medial and posterior vertex.

Worker characters. Measurements (n=9): HLA 1.32 (1.10-1.69), HW 1.31 (1.08-1.76), SL 1.09 (0.99- 1.26), CI 99 (96-104), SI 83 (75-90).

Palpal formula 6,4; middle and hind tibia with prominent pectinate apical spur; dorsal surface of mandible smooth and shining, 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 convex sides, strongly cordate posterior margin; in lateral profile promesonotum forming single convexity; scape with abundant erect setae, length of setae about one half maximum width of scape; mid and hind tibia with abundant erect setae, longest setae about one half maximum width of tibia; sides of head without erect setae; posterior margin of head with erect setae; pronotum and mesonotum with abundant long erect setae, somewhat sparser erect setae on dorsal face of propodeum; color light to dark brown, if somewhat bicolored gaster is darker then mesosoma.

Etymology. The name refers to this species being a southern version of the Mexican species A. sericea   HNS .

Range. Guatemala, Costa Rica, Panama.

Biology. Azteca sericeasur   HNS occurs in moist to wet forest habitats. Queens establish in live stems of understory trees, near the base. Mature colonies are polydomous and dispersed. Foraging columns extend across low vegetation and on the forest floor, connecting multiple small pavilions made of carton (paper-like material constructed by the ants from masticated plant fibers). Clusters of workers and brood occur in the pavilions, and the pavilions may cover membracids and pink scale insects, which the ants tend. Thus the queen is located in a permanent and well-protected site, while the colony is widely spread in a large number of small ephemeral nests.

Along the Río San Luis near Monteverde, I found workers coming and going from a fissure at the base of a live Xanthoxylem (Rutaceae) at a pasture edge. A colony of Camponotus novogranadensis   HNS was using the same entrance, in an apparent case of parabiosis. I have several observations of colonies from the Osa Peninsula. One colony was spread over an area of several square meters, in the dead, hollow core of a live Chimarrhis parviflora (Rubiaceae), in nearby dead sticks, and filling hollow stems of an adjacent Tetrathylacium costaricensis plant (Flacourtiaceae). The Tetrathylacium contained workers, small brood, and mealybugs, but no sexuals or large brood. Small carton nests covered some of the stems and nest entrances. The dead core of the Chimarrhis contained a small pocket of carton, in which I found the grossly distended colony queen and abundant small brood. In another case I found workers streaming through low vegetation. A nest was in a small sapling; the lowest part of the nest was 4m above the ground. There were numerous small cavities and knotholes in the trunk; these were all filled with workers and brood. The lowermost knothole was covered with a carton nest, and the bulk of the workers were in the carton portion. I looked in the carton and in all the knotholes, but I never found a queen. Leanne Tennant, in her study of Tetrathylacium costaricensis in Corcovado, found at least two of her study plants inhabited by A. sericeasur   HNS . Males may be produced in large numbers in the small satellite nests. In August, 1982, I observed a series of carton shelters on vine stems at the base of a buttressed tree, and they were packed with hundreds of adult males. Alate queens are few in collections; two were collected in October and one in July. Nest series with alate queens have been taken twice, both in July. I collected a founding queen in the internode of a Cecropia sapling at Estacion Pitilla in the Guanacaste Conservation Area, and Joel Dunn found an incipient colony in a Cordia bicolor plant near Monteverde.

The queens are generally setose ants, with abundant fine flexuous setae on most body parts. An exception was the queen from the Chimarrhis plant described above. This queen was almost completely devoid of erect setae anywhere on the body, including the tibiae, and the pubescence was sparse and patchy. When collecting from this colony, it took me more than an hour to locate the colony center, chop into the Chimarrhis tree, and extract the physogastric queen. This is probably the oldest queen I have examined, the others being alates or foundresses in incipient colonies (and thus more easy to locate and collect). It may be that once queens establish and become sedentary in the middle of a large colony, they gradually become depilated, perhaps through constant grooming by workers.

Comments. This species is very similar to A. sericea   HNS , differing in the presence of erect setae on the posterior margin of the head. Azteca sericea   HNS is known from Mexico and Guatemala, where it is associated with myrmecophytic orchids. See further discussion of A. sericea   HNS in the Addendum.

Additional material examined. COSTA RICA: Alajuela: 11mi N Florencia , 10°31'N, 84°29'W, 6 Jul 1963 (D. H. Janzen) - workers [ USNM] GoogleMaps ; Guanacaste: Cerro El Hacha, Guanacaste Conservation Area , 10°59'N, 85°33'W, 300m , 1988 (unknown) - alate queen [ MUCR] GoogleMaps ; Estacion Pitilla, Guanacaste Cons. Area , 10°59'N, 85°26'W, 700m , 24 Jan 1991 (J. Longino) - dealate queen GoogleMaps ; Heredia: 11km SE La Virgen , 10°20'N, 84°04'W, 500m , 17 Apr 2003 (ALAS) - alate queen GoogleMaps ; Limon: Hamburg Farm , 10°15'N, 83°27'W, 50m , 11 Jul 1925 (F. Nevermann) - workers, alate queens, males GoogleMaps ; Puntarenas: Sirena, Corcovado National Park , 8°29'N, 83°36'W, 5m , numerous collections and dates (J. Longino) - workers, males; GoogleMaps same locality, Oct 1990 (Saborio) - alate queen [ INBC] GoogleMaps ; Los Planes, Corcovado National Park , 8°38'N, 83°40'W, 100m , 4 Dec 1981 (J. Longino) - workers GoogleMaps ; San Pedrillo, Corcovado National Park , 8°37'N, 83°44'W, 5m , 22 Mar 1981 (J. Longino) - workers GoogleMaps ; Llorona, Corcovado National Park , 8°35'N, 83°42'W, 5m , 2 Jan 1982 (J. Longino) - workers GoogleMaps ; Rio San Luis , 10°17'N, 84°48'W, 850m , 4 Jun 1990 (J. Longino) - workers GoogleMaps ; Wilson Botanical Garden, 4km S San Vito , 8°47'N, 82°58'W, 1200m , 23 Mar 1990 (J. Longino) - workers GoogleMaps ; Rancho Quemado, Osa Peninsula , 8°42'N, 83°33'W, 200m , 1 Oct- 30 Nov 1990 (B. Apu) - alate queen [ INBC] GoogleMaps ; same data, 15 Dec 1990 (J. Longino) - queen and workers GoogleMaps ; Golfito , 8°39'N, 83°09'W, 50m , 23 Jul 1957 (Truxal & Menke) - alate queen [ LACM] GoogleMaps ; Monteverde , 10°18'N, 84°48'W, 1400m , 7 Feb 1999 (J. Dunn) - queen and workers GoogleMaps . GUATEMALA: no specific locality - dealate queen [ USNM] . PANAMA: Canal Zone: Las Cascadas, cacao plantation , 12 Jul 1924 (G C. Wheeler) - alate queen, workers .

USNM

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

MCZC

USA, Massachusetts, Cambridge, Harvard University, Museum of Comparative Zoology

INBC

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

LACM

USA, California, Los Angeles, Los Angeles County Museum of Natural History

JTLC

John T. Longino

MUCR

Costa Rica, Ciudad Universitaria, Universidad de Costa Rica, Museo de Insectos

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Formicidae

Genus

Azteca