Lachnomyrmex victori

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Lachnomyrmex victori
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Lachnomyrmex
Species: L. victori
Binomial name
Lachnomyrmex victori
Feitosa & Brandão, 2008

Lachnomyrmex victori casent0173877 profile 1.jpg

Lachnomyrmex victori casent0173877 dorsal 1.jpg

Specimen labels

Feitosa and Brandão (2008) - L. victori occurs in the Atlantic Forest of southeastern Brazil, at 300–1050m elevation. There is a single record of a L. victori worker foraging in the vegetation. It was collected on the trunk of Croton floribundus (Euphorbiaceae), in the state of São Paulo (M.S. Morini, pers. comm.).

Identification

Feitosa and Brandão (2008) - Body irregularly covered by vermiculate, short, relatively sparse rugae; promesonotum moderately convex; metanotal groove shallowly impressed to obsolete; propodeal spines straight; teeth of propodeal lobes reduced and swollen basally; dorsum of postpetiole with more than 10 long hairs; first tergite of gaster devoid of long flexuous hairs.

Workers of L. victori can be distinguished from the similar Lachnomyrmex plaumanni and the other congeners by the promesonotum only moderately elevated, metanotal suture ill impressed, dorsum of postpetiole with more than 10 long hairs, and first gastral tergite devoid of long hairs.

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

Very little is known about the biology of these cryptic ants. Workers are frequently found in leaf litter and soil samples processed in Winklers or Berlese extractors, but these ants are never especially abundant within samples. When a dealate gyne is found associated with workers in 1m2 samples of leaf litter, normally it is found singly, which suggests that colonies are relatively small and apparently monogynic; workers and nests are extremely difficult to spot in the field, because the workers are very slow moving and well camouflaged; if there is any leaf-litter nest structure, it is destroyed during sifting, but our impression is that they do not construct any permanent nidal structure. Species of Lachnomyrmex apparently nest within the leaf litter, inside natural cavities of the superficial soil layers, fallen logs, and rotten wood, as evidenced by the large number of soil-covered individuals collected, from information recorded in specimen label data, and from observations of collectors. Workers forage alone, in the leaf litter and in the low vegetation, occasionally among epiphytes and moss, probably preying on small soft-bodied arthropods and possibly harvesting plant exudates. (Feitosa and Brandao 2008)

Castes

Nomenclature

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

  • victori. Lachnomyrmex victori Feitosa & Brandão, 2008: 43, figs. 17, 20 (w.q.) BRAZIL.

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

Description

Worker

Holotype HL 0.73; HW 0.72; ML 0.24; SL 0.47; EL 0.14; WL 0.85; PSL 0.17; PL 0.36; PPL 0.14; GL 0.98; TL 3.30; CI 98; SI 66; OI 20. Workers (n=33). HL 0.52–0.76; HW 0.54–0.76; ML 0.16–0.25; SL 0.30–0.51; EL 0.08– 0.16; WL 0.57–0.93; PSL 0.11–0.21; PL 0.22–0.39; PPL 0.12–0.19; TL 2.26–3.51; GL 0.68–1.02; CI 97–103; SI 51–66; OI 15–22.

Body reddish-brown to black, with gaster and appendages slightly lighter. Body irregularly covered by short, relatively sparse rugae, somewhat longer and longitudinal on head dorsum; mandibles with short longitudinal striae restricted to basal portion; petiole and postpetiole finely and irregularly rugose. Abundant pilosity on head and promesonotum dorsum; dorsum of petiolar node and postpetiole each with more than 10 long hairs; first gastral tergite entirely devoid of long flexuous hairs.

Head usually as long as broad, with vertexal margin moderately convex; frontal lobes laterally rounded; eyes with about seven facets on maximum diameter. Promesonotum moderately convex in profile, but distinctly higher than propodeum level; metanotal groove shallow to virtually obsolete; propodeal spines straight; teeth of propodeal lobes swollen and very reduced, with less than one-third of propodeal spines length. Petiolar node moderately elevated, dorsally rounded, and with the posterior face weakly sloped in lateral view; postpetiole weakly convex dorsally and without ventral processes.

Queen

(n=9). HL 0.69–0.78; HW 0.69–0.79; ML 0.21–0.26; SL 0.44–0.49; EL 0.18–0.21; WL 0.85–1.06; PSL 0.16–0.22; PL 0.35–0.41; PPL 0.13–0.18; GL 0.94–1.17; TL 3.21–3.83; CI 99–101; SI 61–66; OI 24–279.

Differing from worker by the following combination of characters: body pilosity denser and shorter, with first tergite of gaster bearing around 10 long flexuous hairs at the anterior portion, near postpetiole insertion; eyes with around 13 facets at greatest diameter; petiolar node comparatively lower.

Type Material

Holotype worker. BRAZIL: Santa Catarina: São Bonifácio, P.E. da Serra do Tabuleiro, 27º49'06S 48º54'41W, 8–13.iii.2004, R.R. Silva, B.H. Dietz & N.L. Albuquerque cols, no. 27 [MZSP]. Paratypes. same data as holotype, nos. 3/27 (3 workers and 1 gyne) [MZSP]; same data, no. 27 (1 worker) [CASC]; BRAZIL: Espírito Santo: Santa Teresa, E.B. Santa Lúcia, 19º58'09S 40º32'15W, 20– 24.i.2002, J.H. Schoereder & C.R. Ribas cols, no. 37 (2 workers) [MZSP]; same data, no. 37 (1 worker) [USNM]; Santa Catarina: Blumenau, P.E. das Nascentes, 27º06'15S 49º09'14W, 20–27.x.2000, R.R. Silva & F. Eberhardt cols, nos. 13/17/20/24 (4 workers) [MZSP]; Paraná: Tunas, P. das Lauráceas, 24º51'16S 48º43'00W, 21–29.ii.2001, R.R. Silva & F. Eberhardt cols, nos. 7/9/11/13/17/28/50 (6 workers e 1 gyne) [MZSP]; same data, no. 7 (1 worker) [AMNH]; same data, no. 7 (1 worker) [BMNH]; same data, no. 7 (1 worker) [ICNC]; same data, no. 7 (1 worker) [IHVL]; same data, no. 9 (1 worker) [INBC]; same data, no. 28 (1 worker) [MIZA]; São Paulo: Salesópolis, E.B.B., 12–17.iv.1997, B.H. Dietz & C. I. Yamamoto cols, nos. 4/24 (2 workers and 1 gyne) [MZSP]; same data, no. 7 (1 worker) [WPMC]; same locality, 20–26.x.1997, C. Klingenberg & C.I. Yamamoto cols, no. 22 (1 worker) [MZSP].

Etymology

The name of this species is an homage to Victor Vieira da Silva, son of the colleague myrmecologist Rogério Rosa da Silva.

References

  • Feitosa, R.M. & Brandão, C.R.F. 2008. A taxonomic revision of the Neotropical myrmicine ant genus Lachnomyrmex Wheeler (Hymenoptera: Formicidae). Zootaxa 1890, 1-49.