Taxonomic history
Wheeler, 1907d PDF: 707 (q.m.); Wheeler, 1949 PDF: 673 (l.).Combination in Atta (Trachymyrmex): Forel, 1912f PDF: 182.Combination in Trachymyrmex: Gallardo, 1916c PDF: 242.Senior synonym of Trachymyrmex virginiana: Wheeler, 1902g PDF: 29.Senior synonym of Trachymyrmex septentrionalis vertebrata: Creighton, 1950a PDF: 323.Senior synonym of Trachymyrmex septentrionalis obscurior: Weber, 1958b PDF: 53.Senior synonym of Trachymyrmex septentrionalis seminole: Weber, 1958b PDF: 53.See also: Wheeler, 1911i PDF: 246; Smith, 1979: 1411; Petralia & Vinson, 1980 PDF: 383; Rabeling et al., 2007 PDF: 17.The fungus gardening ant, Trachymyrmex septentrionalis, is an abundant and widespread member of the New World ant tribe Attini.Ants in this tribe are remarkable in that all species have established a symbiotic relationship with a specific fungus species, whereby they cultivate underground gardens of the fungus as food for their colonies.While most fungus-growing ants live in the tropics, Trachymyrmex septentrionalis is one of a few that has radiated up into the temperate zones of the United States.
Trachymyrmex septentrionalis has the widest range of any North American attine ant and the only one occurring east of the Mississippi river.It occurs in arid areas from Texas across the southeast, but also in areas of notable cold, as far north as Long Island, and west to central Illinois and southern Ohio. This species is unique among the ants in tribe Attini in that colonies over most of the range go dormant in the winter and those furthest north have only a short active season (4-5 months).In the south where temperatures remain greater than 64oF (18oC), T. septentrionalis colonies remain active all winter.
While their geographic range is large, its distribution is patchy. Trachymyrmex septentrionalis and the symbiotic fungus they cultivate in their nests require arid, sandy soils. Further north, T. septentrionalis occurs exclusively in open habitats with pure sand soil. In the southeastern United States, Trachymyrmex septentrionalis are very common in multiple habitats, preferring open areas with light shade. Seal and Tschinkel (2006, 2010) describe T. septentrionalis as a “characteristic animal” of the arid longleaf pine forests along the Gulf coast of the United States. In these forests T. septentrionalis colonies occur in large numbers, with up to 1000 nests per hectare.They are important species in recycling nutrients in the nutrient-poor soil in this habitat.
Trachymyrmex septentrionalis are smallish, red-brown ants with well-developed eyes. The workers are all fairly similar in size.Their colonies are fairly small, about 300-400 individuals in a mature nest. They create fairly simple underground nests with one or several chambers.However they move these chambers seasonally, digging deeper in warmer seasons and avoiding areas where the water table level is too high to permit a range of depth.Their digging behavior is thought to track ideal and specific temperature and humidity conditions for the fungus gardens on which they are dependent.Especially in the spring and fall when workers are in high gear excavating their nest, their colonies can be easily located by the distinctive and visible crescent-shaped excavation mounds.
Trachymyrmex septentrionalis forage for a variety of debris they use to fuel their fungus gardens.This includes dead plant matter, insect frass, and occassionally living plant leaves that they cut into movable sizes.Winged reproductive male and female ants leave the nest on nuptial flights during summer months to start new colonies.The females, which become the new colony queen, carry a small piece of fungus from the old colony’s garden.After she mates, she uses this to inoculate the new nest’s fungus garden.
The name septentrionalis refers to the seven brightest stars in the Northern Hemisphere’s Great Bear constellation, a nod to the northern distribution of this species.
(MacGown 2014; Rabeling et al. 2007; Seal and Tscinkel 2006; 2010; Seal Gus and Mueller 2012)
Oecodoma virginiana Buckley , 1867: 346. Syntype worker(s), near Aquia , Virginia , U.S.A. (repository unknown) [not examined]. Synonymy under septentrionalis by Wheeler, 1902: 29; here confirmed. Younger name valid under ICZN Article 23.9 (see discussion below)
Atta septentrionalis McCook , 1881: 362. Worker described; Island Heights, Pine Barrens , New Jersey , U.S.A. (repository unknown) [not examined]
Atta septentrionalis McCook ; Wheeler 1907: 707 [description of queen and male]
Atta septentrionalis McCook ; Forel 1912: 182 [combination in Atta (Trachymyrmex) ]
Atta septentrionalis McCook ; Gallardo 1916: 242 [combination in Trachymyrmex ]
Atta (Trachymyrmex) septentrionalis var. obscurior Wheeler , 1907: 709. Syntype worker(s) described, Austin , Travis County , Texas , U.S.A.
Atta (Trachymyrmex) septentrionalis obscurior Wheeler ; Wheeler 1911: 247 [raised to subspecies of septentrionalis ]
Atta (Trachymyrmex) septentrionalis obscurior Wheeler ; Wheeler 1911: 246 [description of queen]
Trachymyrmex septentrionalis obscurior (Wheeler) ; Creighton 1950: 324 [Combination in Trachymyrmex ]
Trachymyrmex septentrionalis obscurior (Wheeler) ; Weber 1958: 53 [Synonymy, under septentrionalis ]
Atta (Trachymyrmex) septentrionalis obscurior var. crystallina Wheeler , 1911: 247. Syntype workers, queens and males; Huntsville Walker County , Texas , U.S.A. [unavailable name]
Trachymyrmex septentrionalis obscurior var. crystallina Wheeler ; Creighton 1950: 324 [material referred to obscurior ]
Atta (Trachymyrmex) septentrionalis obscurior var. irrorata Wheeler , 1911: 247. Syntype workers; Huntsville , Walker County , Texas , U.S.A. [unavailable name]
Trachymyrmex septentrionalis obscurior var. irrorata Wheeler ; Creighton 1950: 324 [material referred to obscurior ]
Atta (Trachymyrmex) septentrionalis obscurior var. seminole Wheeler , 1911: 247. Syntype worker(s), queen(s) and male(s); Miami , Florida , U.S.A. [unavailable name]
Trachymyrmex septentrionalis seminole (Wheeler) ; Creighton 1950: 324 [subspecies of septentrionalis , first available use of seminole ]
Trachymyrmex septentrionalis seminole (Wheeler) ; Weber 1958: 53 [Synonymy, under septentrionalis ]
Atta (Trachymyrmex) septentrionalis var. vertebrata Wheeler , 1911: 246. Syntype workers and queens; Lakehurst , New Jersey , U.S.A.
Trachymyrmex septentrionalis var. vertebrata Wheeler ; Creighton 1950: 323 [Synonymy, under septentrionalis ]
Diagnosis
Worker: HL 0.84-0.96, HW 0.88-1.0, CI 104-105, SL 0.84-0.96, SI 96, ML 1.12-1.32. A relatively small (HL 0.84-0.96, HW 0.88-1.0), conspicuously tuberculate species with normally proportioned legs and antennal scapes (SI 96). Head slightly broader than long (CI 104-105), sides subparallel behind the eyes, gradually tapering anteriorly between the eyes and the mandibular insertion. Posterior margin moderately concave. Preocular carinae long, traversing 2/3 to 3/4 of the distance between the eye and the frontal carina but not nearly touching the frontal carinae. In full-face view, frontal lobes rounded or subtriangular, usually somewhat asymmetric, with the anterior side longer than the posterior. Anterolateral promesonotal teeth welldeveloped, thin, sharply pointed in dorsal view, projecting somewhat upward as well as horizontally. Anterior median pronotal tubercles upright, toothlike in posterior view. Propodeal teeth usually longer than the distance separating their bases, often spinelike, pointed. Posterior margin of head, mesonotal dorsum, dorsal surfaces of petiole, postpetiole and gaster conspicuously tuberculate, tuberculi largest particularly on posterior corners of head and on the first gastric tergite. Color brownish yellow to medium reddish-brown.
Queen: HL 1.05-1.2, HW 1.1-1.25, CI 104-107, SL 1.05-1.15, SI 96-100, ML 1.55-1.85. As in worker diagnosis, but with caste-specific morphology the mesosoma related to wing-bearing. Dorsolateral pronotal teeth variable in size, but sharply triangulate in dorsal view, often blunt in anterior view. Ventrolateral pronotal teeth variable, but generally lobelike. Mesoscutum coarsely, longitudinally rugulose, finely tuberculate, tuberculi with short, sharply recurved hairs. First gastric tergite with numerous small tubercles bearing short, recurved, decumbent, recurved setae.
Male: HL 0.75, HW 0.8-0.9, CI 100-107, SL 0.9-1.1, SI 113-122, ML 1.5-1.85. In frontal view, posterior corners of the head angulate, angles formed by short, tuberculate ridges best seen in dorsal view; ocelli small and inconspicuous. Dorsoventral pronotal teeth, short, sharp, triangulate in dorsal view; ventrolateral teeth short, triangular or lobelike. Sculpture of mesoscutum coarse, irregular, rugulose, sometimes weakly longitudinal. Tuberculi generally absent (miniscule, if present) on first gastric tergite.
Discussion
Trachymyrmex septentrionalis is disturbingly similar to the allopatric T. carinatus , but separable by the characters given in the key and by their non-overlapping distributions; carinatus occurs only in the desert southwest, septentrionalis occurs in Texas and the states north and east of there. Molecular evidence suggests the similarity is convergent (see Figure 21 & General Discussion). It is likely that collections identified in the literature as T. septentrionalis from Durango, Mexico may actually represent T. carinatus (Rojas Fernandez 1994).
Solely considering the publication date, Oecodoma virginiana Buckley (1867) would have seniority over McCook 's (1881) Atta septentrionalis . But since Buckley 's species description is insufficiently detailed to either recognize T. septentrionalis or distinguish between septentrionalis and its congeners, Wheeler (1902) proposed Oocodoma virginiana Buckley to be a junior synonym of Atta septentrionalis McCook . We agree with Wheeler and continue using the species name septentrionalis . Unfortunately, the locality of both types is unknown and we could not examine them.
Etymology
McCook (1881) described the worker of T. septentrionalis based on material collected from Island Heights in the New Jersey Pine Barrens. The species name septentrionalis refers to the seven plowing oxen, the brightest stars of the Great Bear constellation, which dominate the skies of the northern hemisphere. Thus, septentrionalis loosely translates to "northern" in the context of North American fungus-growing ants.
Biology
Trachymyrmex septentrionalis has the most extensive distribution of all attine ants in the US. It has been collected from Texas to Florida and as far north as central Illinois, southern Ohio and Long Island, New York. Like most fungus-growing ants, the distribution of T. septentrionalis is locally patchy. In part, this may be a consequence of the distribution of suitable soils.
In the northern part of its range, T. septentrionalis occurs exclusively on pure sand soils in open habitats and open woodlands of the Pine Barrens. In the southern US, T. septentrionalis is abundant in a wide variety of similar oak and pine dominated habitat types, all characterized by very sandy soils and light (if any) shade. It has also occasionally been found nesting in sandy clay soils in well-developed forests with considerable shade, particularly in the southern part of its range.
During periods of high nest excavation activity in spring and fall, the crescent shaped mounds of T. septentrionalis are distinctive and conspicuous (Tschinkel & Bhatkar 1974). Older colonies may have several chambers, connected by one to few tunnels and inhabit a few hundred individuals (Weber 1972). As the northernmost distributed species of Trachymyrmex , colonies of T septentrionalis hibernate during the winter and the fungus garden assumes a dormant condition. The length of hibernation varies considerably with respect to latitude. The northernmost populations in New York and New Jersey have short active periods from early May to September, whereas Florida populations remain active during the winter, as long as temperatures exceed 18ºC (Weber 1972). The army ant Neivamyrmex nigrescens and the ectatommine ant Gnamptogenys hartmani are known to raid colonies of T septentrionalis (Cole 1939).
Additional material examined: U.S.A. : Alabama , Autauga County : Prattville ( AS Mikheyev ) ; Mobile County : Dauphin Island ( WS Creighton ) , Theodore ( EO Wilson ) ; Arkansas , Miller County : State Line Rd. ( UG Mueller ) ; Washington County : Devil 's Den State Park ( AS Mikheyev ) ; District of Columbia , Washington ( T Pergande, HS Barber ) ; Florida , Alachua County : Archer ( M Deyrup ) , Gainesville ( M Deyrup, KW Copper ) ; Baker County : Osceola National Forest, East Tower, 250 ( M Deyrup ) ; Bay County : St. Andrews State Recreation Area ( M Deyrup ) ; Bradford County : Hampton ( M Deyrup ) ; Brevard County : Micco 6mi W Micco Rd ( M Deyrup ) , Melbourne Beach 2mi S Ecological Preserve ( M Deyrup ) , Eau Gallie ( M Deyrup ) , Indian River City, Dicerandra Preserve ( M Deyrup ) , Titusville ( M Deyrup ) ; Broward County : Hollywood, Topeekeegee Yugnee Park ( M Deyrup ) , Ft. Lauderdale ( DE Read ) ; Citrus County : 12mi NWBrooksville, Withlacoochee State Forest ( M Deyrup ) , Pine Oak Estates, 488, 3mi NE 495 ( M Deyrup ) ; Clay County : Camp Blanding ( M Deyrup ) ; Collier County : Rookery Bay Preserve ( M Deyrup ) ; Columbia County : O'Leno State Park ( M Deyrup ) , Ichetucknee Springs State Park ( M Deyrup ) , I-75 & I-10 , 0.5mi W ( M Deyrup ) ; Dade County : Coral Gables, Matheson Hammock ( M Deyrup ) , Matheson State Park ( EO Wilson ) ; Desoto County : Arcadia, 13mi E, 2mi S of Headquarters ( M Deyrup ) , Arcadia, W bank of Peace River ( M Deyrup ) , Pine Level ( M Deyrup ) ; Dixie County : Jena ( M Deyrup ) ; Duval County : Jacksonville ( M Deyrup ) , Fort George, Bis Talbot Is. State Park ( Z Prusak ) ; Escambia County : Pensacola ( M Deyrup, EO Wilson ) ; Franklin County : Carabelle Beach , 5mi W ( M Deyrup ) ; Gilchrist County : Trenton ( M Deyrup ) ; Glades County : Muse2mi S ( M Deyrup ) ; Hardee County : Zolfo Springs ( M Deyrup ) , Paynes Creek Historical Site ( M Deyrup ) ; Hendry County : 832 & 833 , 3mi NE ( M Deyrup ) ; Hernando County : Bayport ( M Deyrup ) ; Highlands County : Archbold Biological Station ( SP Cover, M Deyrup, UG Mueller, C Rabeling, TC Schneirla, NA Weber ) , Sebring ( M Deyrup ) , Highlands Hammock State Park ( M Deyrup ) , Lakemont ( M Deyrup ) ; Hillsborough County : Tampa ( M Deyrup ) ; Holmes County : Ponce de Leon Springs State Park ( M Deyrup ) ; Jackson County : Three Rivers State Recreation Area ( M Deyrup ) , Florida Caverns State Park ( M Deyrup ) ; Lake County : Lake Louisa State Park ( M Deyrup ) ; Ocala National Forest ( M Deyrup ) ; Lee County : Koreshan State Historic Site ( M Deyrup ) ; Leon County : Apalachicola National Forest ( M Deyrup ) , Tallahassee ( AS Mikheyev ) ; Levy County : Bronson ( M Deyrup ) ; Liberty County : Torreya State Park ( M Deyrup ) ; Madison County : I-10 & SR 53 ( M. Deyrup ) ; Manatee County : Lake Manatee Recreation Area ( M Deyrup ) , Bradenton ( M Deyrup, GD Reynolds ) ; Marion County : Ocala National Forest ( M Deyrup ) , Wiersdale ( H Spencer ) ; Martin County : Jonathan Dickinson State Park ( WF Buren, M Deyrup, UG Mueller ) , Port Sewall ( AL Melander ) ; Miami-Dade County : Miami ( WM Wheeler ) ; Monroe County : Bahia Honda State Recreation Area ( M Deyrup ) ; Nassau County : Fort Clinch State Park ( M Deyrup ) ; Okaloosa County : Eglin Air Force Base ( M Deyrup ) , Crestview ( M Deyrup ) ; Orange County : Orlando ( M Deyrup ) , Wekiwa Springs State Park ( M Deyrup, Z Prusak ) ; Osceola County : Kenansville ( M Deyrup ) , Kissimmee ( M Deyrup ) ; Pasco County : St. Leo ( M Deyrup ) ; Pinellas County : Fort Desoto Park ( M Deyup ) , Belleair ( AT Slosson ) ; Polk County : Haines City ( M Deyrup, DE Read ) , Winter Haven ( C Dykes ) ; Putnam County : Crescent ( WM Mann ) ; Santa Rosa County : Milton10mi E ( M Deyrup ) ; Sarasota County : Venice ( M Deyrup ) ; Seminole County : Oviedo1mi N ( M Deyrup ) ; St. Lucie County : Ft. Pierce ( M Deyrup ) ; Sumter County : Bay Hill ( M Deyrup ) ; Taylor County : Perry ( M Deyrup ) ; Volusia County : Blue Springs State Park ( M Deyrup ) ; Wakulla County : Wakulla Springs ( M Deyrup ) ; Walton County : DeFuniak Springs ( M Deyrup ) ; Washington County : Falling Water State Recreation Area ( M Deyrup ) ; GEORGIA , Lowndes County : Valdosta ( AC Cole ) ; Macon County : Marshallville ( FJ Bartel ) ; Richmond County : Ft. Gordon ( RR Snelling ) ; Ware County : Waycross ( AS Mikheyev ) ; Illinois , Peoria County : Sand Ridge State Park ( AS Mikheyev ) ; Pope County : Dixon Springs State Park ( AS Mikheyev ) ; Kentucky , Marshall County : Kentucky Dam ( WL Brown ) ; Louisiana , Allen Parish , Reevers ( AM Himler ) ; Beauregard Parish : De Ridder ( WF Buren ) ; Rapides Parish : Alexandria ( WF Buren ) ; Hineston ( UG Mueller ) ; Red River Parish : Rt. 371, NE Hall Summit ( UG Mueller ) ; St. Tammany Parish : Sildell ( J Mathew ) ; Vernon Parish : LA10, mi 7 ( UG Mueller ) ; Walker County : Sam Houston National Forest ( WL Brown ) ; Webster Parish : Lake Bistineau St. Park ( EG Riley ) , Sibley3mi W ( UG Mueller ) ; Mississippi , Clarke County : Clarkco State Park ( WP Mackay ) , Clay County : Cedar Bluff ( AC Cole, LC Murphree ) ; Forrest County : Hattisburg ( AH Sturtevant ) ; Hardin County : Mantee ( UG Mueller ) ; Harrison County : Gulfport ( AC Cole ) ; Lee County : Tupelo ( MR Smith ) ; Lowndes County : Columbus ( MR Smith ) ; Monroe County : Quincy ( MR Smith ) ; Oktibbeha County : Agricultural College ( MR Smith ) , Starkville ( AS Mikheyev ) ; Stone County : Wiggins ( AH Sturtevant ) ; Wayne County : Waynesboro ( AH Sturtevant ) ; North Carolina , Bladen County : White Oak ( LR Sasser ) ; Dare County : Roanoke Island ( NA Weber ) ; Richmond County : Hoffman ( AS Mikheyev ) ; New Jersey , Burlington County : Lebanon State Forest ( AS Mikheyev ) , Moorestown ( NJR White ) ; Cumberland County : Bridgeton ( FM Schott ) , Vineland ( M Treat ) ; Middlesex County : Bonhamtown ( LB Woodruff ) ; Ocean County : Howardsville ( WL Brown ) , Lakehurst ( WM Wheeler, WM Mann, R Crozier ) , Lakewood ( FM Schott ) , Pine Barrens ( NA Weber ) ; New York , Suffolk County : Centereach, Long Island ( AS Mikheyev ) ; Oklahoma , Beckham County : Sayre ( AC Cole ) ; South Carolina , Dillon County : Lake View ( DL Stephan ) ; Florence County : Florence ( MR Smith ) ; Jasper County : Tillman ( RA Mendez ) ; Oconee County : Oconee State Park ( MR Smith ) ; Pickens County : Clemson College ( MR Smith ) ; Tennessee , Davidson County : Nashville ( WS Creighton ) ; Dickens County : Montgomery Bell Park ( Pfitzer & Scott ) ; Sevier County : Chilhowee Mtns. ( AC Cole ) ; Webster County : Shiloh National Military Park ( UG Mueller ) ; Texas , Anderson County : Palestine ( FC Bishopp ) ; Angelina County : Angelina National Forest ( AS Mikheyev, C Rabeling ) ; Bastrop County : Stengl Biological Station ( UG Mueller, C Rabeling ) ; Baylor County : at Brazos River, River Road ( UG Mueller ) , 10km NKurten ( WP Mackay ) , College Station ( EG Riley, NA Weber ) ; Brown County : Brownwood ( WD Pierce ) ; Caldwell County : Powell Road ( UG Mueller ) ; Cass County : Atlanta State Park ( JD Moody ) ; Denton County : Denton ( WH Long, WM Wheeler ) ; Fannin County : Ivanhoe ( E & G Wheeler ) ; Fort Bend County : Sugarland, Cullinan Park ( UG Mueller ) ; Franklin County : Montichello Missionary Baptist Church ( UG Mueller ) ; Grimes County : Rt.30, 3.7mi E Carlos ( UG Mueller ) , Shiro ( WF Buren ) ; Hardin County : Rt 327, crossing of Village Creek ( UG Mueller ) ; Lamar County : Paris ( A Rucker, CJ Brues ) ; Liberty County : Liberty ( UG Mueller ) ; Medina County : Benton, near Devine ( WH Long ) ; Milam County : Milano ( WM Wheeler ) ; Montague County : Bonita, rest area E Rt. 82 & Rt. 1815 ( UG Mueller ) ; Montgomery County : Willis ( JC Bridwell ) ; Sabine County : 9mi EHemphill ( Anderson, Riley & Moody ) ; San Jacinto County : Rt. 2025, Lone Star Trail Head ( UG Mueller ) ; Smith County : Tyler State Park, Blackjack Nature Trail trailhead ( UG Mueller ) ; Travis County : Austin ( UG Mueller, C Rabeling, WM Wheeler ) , Montopolis ( WM Wheeler ) ; Walker County : Huntsville ( Hartman ) ; Washington County : Washington-on-the-Brazos State Park ( UG Mueller ) ; Wise County : 7.5mi SWBridgeport ( JV Moody ) ; Wood County : 9mi E Minneola on US 80 ( JV Moody ) , Goodwin Woods, 3.5mi SW Hainsville ( EG Riley ) ; Virginia , Appomattox County : Appomattox-Buckingham State Forest ( S Rehner ) ; Prince George County : Ft. Lee ( RR Snelling ) ; West Virginia , Putnam County : Barcroft ( JC Bridwell ) .
Trachymyrmex septentrionalis is a species of ant in the subfamily Myrmicinae.[1] It is the northernmost species in the tribe Attini.[2]
The species is common in eastern United States, where it inhabits sandy soils.[3] It is the most widely distributed fungus-growing ant in the United States, known from Texas to Florida, north to Illinois, Ohio and New York. The species has been identified in Durango, Mexico, but these records are likely that of the very similar Trachymyrmex carinatus.[4]
Trachymyrmex septentrionalis is a species of ant in the subfamily Myrmicinae. It is the northernmost species in the tribe Attini.
Trachymyrmex septentrionalis is een mierensoort uit de onderfamilie van de Myrmicinae.[1][2] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1881 door McCook.
Bronnen, noten en/of referenties
Trachymyrmex septentrionalis
(McCook, 1881)[1]
Trachymyrmex septentrionalis (лат.) — вид муравьёв из трибы грибководов Attini подсемейства мирмицины. США: от Техаса до Флориды, на север до Иллинойса, Огайо и Нью-Йорка[2].
Мелкие муравьи (менее 5 мм), окраска от желтоватой до красновато-буроватого цвета. Длина головы рабочих HL 0,84-0,96 мм, ширина головы HW 0,88-1,0 мм. Усики состоят из 11 члеников, без явной булавы. Тело покрыто многочисленными бугорками (каждый с волоском) и шипиками. Живут в земляных гнёздах, под камнями и корнями растений. Характерны своим тесным симбиозом с грибами, выращиваемыми в муравейниках[2].
Для вида T. septentrionalis доказана биотурбация, или перемещение слоёв почвы под землёй. Экстраполируя экспериментальные данные по перемещению слоёв песка под гнездом, сделан вывод, что на один гектар Т. septentrionalis переносят 800 кг песка в год на поверхность, а еще 200 кг (17% от общего вынутого объема) смещают под землей[3]. Несмотря на малочисленность (500-1000 муравьёв в одной семье) и мелкие размеры (3-6 мм), колонии T. septentrionalis экстремально обильны. На гектар соснового леса может приходится более 1000 муравейников, которые суммарно выкапывают более 1 тонны почвы в год[4]. За тысячелетие эти муравьи полностью перемешивают верхние 6,3 см почвы[5]. Когда муравьи выкапывают свои гнезда, они выкладывают вырытую землю на поверхности характерным лунным полумесяцем[6]. Летом (июль и август) грибные камеры обычно располагаются глубже 60 см, в то время как весной и осенью они обычно залегают на глубине 20–40 см[4].
Вид был впервые описан в 1881 году под первоначальным названием Atta septentrionalis McCook, 1881. С 1912 года в составе подрода Atta (Trachymyrmex), а с 1916 года в отдельном роде Trachymyrmex[2].
Trachymyrmex septentrionalis (лат.) — вид муравьёв из трибы грибководов Attini подсемейства мирмицины. США: от Техаса до Флориды, на север до Иллинойса, Огайо и Нью-Йорка.
