Mycetagroicus cerradensis

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Mycetagroicus cerradensis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Mycetagroicus
Species: M. cerradensis
Binomial name
Mycetagroicus cerradensis
Brandão & Mayhé-Nunes, 2001

Mycetagroicus cerradensis casent0178478 profile 1.jpg

Mycetagroicus cerradensis casent0178478 dorsal 1.jpg

Specimen Label

Combining in formation from labels and field notes of Kempf and Lenko, we can say that this species occurs in the “cerrado” (samples #4151, 4246, and 4472). Although we have no clear information on the collecting sites of most samples, all localities we listed above are (or were) cerrado areas. Lenko recorded nests as subterranean, with one circular entrance circled by a 3 mm sand crater, surrounded by a 5 cm high mound with 12 cm at base. He has also recorded the workers of sample #4472 carrying minute plant fragments and very small seeds of grasses and other unspecified items. The Botucatu sample label says “pasture.” (Brandao and Mayhe-Nunes 2001)

Identification

Brandao and Mayhe-Nunes (2001) - Mycetagroicus cerradensis is easily recognized by three features: the presence of two prominent clypeal concave projections, rounded at apex, the subtriangular frontal lobes, and the absence of median pronotal teeth.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Brazil (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • cerradensis. Mycetagroicus cerradensis Brandão & Mayhé-Nunes, 2001: 644, figs. 1-7 (w.) BRAZIL.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

Brandão and Mayhé-Nunes. 2001. Figure 5.
Brandão and Mayhé-Nunes. 2001. Figure 4.
Brandão and Mayhé-Nunes. 2001. Figure 7.

TL 3.36; HL 0.92: HW 0.92; IFW 0.52; ScL 0.78; TrL 1.34; Hfl 1.23. Uniformly brown-yellowish to medium brown: gaster darker than the rest of the body in the two Minas Gerais samples; the Paraopeba workers have also the frontal disk of the head darker than the rest of the body. Long and dense pilosity all over the body, hairs mostly erect, but flexuous, little shorter on the appendages than in other regions of the body.

Head. Dorsal surface of the mandibles with some 30 rugulae over a straight line perpendicular to the external margin at midlength, ending abruptly at the smooth flange parallel to the masticatory margin. Masticatory margin with an apical tooth followed by 7-10 minute regularly spaced teeth, except for the basal one which is separated from the others by a small diastema; the subapical teeth of similar size and triangular in young workers; external margin almost straight at base, weakly concave at apex, curving inwards at the level of the third subapical tooth. Clypeus with pronounced concave anterolateral projections with rounded apex, at each side, arising near the base of the frontal lobes. Frontal area triangular, depressed but mostly Inconspicuous. Frontal lobes subtriangular. the anterior border rounded, crenulated, and almost as long as the straight posterior borders: faces meeting in an attenuated angle of circa 120°. Frontal carinae sinuous, weakly diverging caudad, fading before reaching the occiput. Eyes with 12 facets across its greatest diameter. Antennal scapes surpassing the occipital corners by near one third of their length, when laid back over the head as much as possible. All funicular segments longer than broad.

Alitrunk. Lateral pranatal spines triangular when seen from above. projecting laterad when seen in frontal view. Pair of median projections on pronotum very short or absent; middle of the mesonotum with a low protuberance, better seen in side view, microscopically tuberculated. Anepisternum separated from katepisternum by a strong ridge. Metanotal groove relatively large in side view, shallowly impressed. Propodeal spiracle opening slit-shaped in side view.

Petiole, postpetiole, and gaster. Petiole without conspicuous projections: the node proper as seem from above slightly longer than broad, and broader anteriorly. Postpetiole slightly broader than long in dorsal view. Gaster with regularly spaced hair pits, almost in straight parallel lines. The dorsal disk of the gaster marked by two faint widely spaced longitudinal keels.

Type Material

Holotype: Worker, BRAZIL. sao Paulo State: Rancharla (22° 15' S, 50° 55' W). 5.x.1969, E. Amante (Museu de Zoologia da Universidade de Sao Paulo # 6004 Kempfs notebook), deposited at MZSP. Paratypes (all from Brazil); 41 workers. same data as holotype (38 MZSP - one prepared for SEM: 3 National Museum of Natural History; 3 Centro de Pesquisas do Cacau); 4 workers, Distrito Federal: Brasilia (15° 47’ S, 47° 55' W), parque Nacional de Brasilia, 13-14.v.1971, “cerrado.” W. L. & D. E. Brown (col.) (2 MZSP: 2 Museum of Comparative Zoology): 33 workers, Golas: Faz. Cachoeirlnha, Jatal (17° 53' S, 51° 43' W), 20.vii.1964, Exp. Dep. Zool col. (MZSP # KL 4264) (20 MZSP; 3 California Academy of Sciences; 4 Instituto de Biologia Universidade Federal Rural do Rio de Janeiro; 3 Los Angeles County Museum of Natural History; 3 USNM}: 3 workers, Mato Grosso (today Mato Grosso do Sul): Fazenda Fortaleza, Paranaiba (19° 40' S, 51° 11' W), 19.ii.1976. J. L. M. Diniz (Diniz's field book # 951) (MZSP): 3 workers, Minas Gerais: Paraopeba (19° 18' S, 44° 25' W), iii.1990, J. A. Barcelos (leg.) (2 MZSP; 1 CECL): 2 workers, Minas Gerais: Lassance (17° 54' S. 44° 34' W), 18.ix.1985, P. Pacheco col. (MZSP): 5 workers, Parana: Senges (21° 59' S, 48°23' W). 03.xi.1965, W. Kempf leg, (MZSP# 4154) (3 MZSP: 2 CECL); 19 workers, Sao Paulo: Fazenda Itaquere, Boa Esperanca do Sul (21° 59' S, 48° 23' W), 20.vii.1964, K. Lenko leg. (MZSP # 4472, Lenko notebook) (10 MZSP- one prepared for SEM: 3 CECL; 3 INPA; 3 The Natural History Museum): 6 workers, Sao Paulo: Agudos (22° 28' S, 49° 00' W), 13.xii.1955. W. Kempf leg. (MZSP # 1492: “Parque do Seminario” Kempf’s notebook) (4 MZSP; 2 CECL): 2 workers, Sao Paulo: Botucatu (22° 52' S. 48° 26' W), 11.iv.1985; 11.x.1984, M. F. Barros Pereira col (MZSP).

Etymology

The name refers to the distribution of this species, known only from the Brazilian “cerrados,” a savanna-like formation that once covered most of the Brazilian Central Plateau.

References