Lachnomyrmex haskinsi

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Lachnomyrmex haskinsi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Lachnomyrmex
Species: L. haskinsi
Binomial name
Lachnomyrmex haskinsi
Smith, M.R., 1944

Feitosa and Brandão (2008) - Lachnomyrmex haskinsi has been recorded from Costa Rica and Panama, in 200–800m elevation wet forests. Workers are usually collected in samples of sifted leaf litter. Dr. John Longino observed a few workers, one with a larva, scattered throughout the debris of a Brachymyrmex nest he was collecting from beneath rotten wood on the forest floor (Longino 2007).

Identification

Feitosa and Brandão (2008) - Body covered by continuous vermiculate rugae; petiolar node considerably elevated and subtriangular; dorsum of postpetiole with about six long hairs, and with a raised prominence medially; subpostpetiolar process present and well developed; first tergite of gaster devoid of long hairs. This species is most similar to Lachnomyrmex regularis, but can be easily distinguished from the latter by the smaller size, more irregular rugulation, and presence of fine short rugae on postpetiole dorsum. Workers of Lachnomyrmex fernandezi and Lachnomyrmex mackayi can also be confounded with L. haskinsi, but they present long flexuous hairs at least on the anterior third of the first gastral tergite.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Costa Rica, Panama (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.

  • haskinsi. Lachnomyrmex haskinsi Smith, M.R. 1944e: 227, figs. 1, 2 (w.) PANAMA. Feitosa & Brandão, 2008: 19 (q.).

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

Description

Worker

Feitosa and Brandão (2008) - Holotype HL 0.60; HW 0.55; ML 0.22; SL 0.38; EL 0.09; WL 0.68; PSL 0.11; PL 0.24; PPL 0.13; GL 0.79; TL 2.65; CI 92; SI 68; OI 17. Workers (n=2). HL 0.61–0.65; HW 0.60–0.63; ML 0.21–0.24; SL 0.39; EL 0.11–0.13; WL 0.71–0.74; PSL 0.16–0.17; PL 0.25–0.30; PPL 0.13–0.14; GL 0.79–0.80; TL 2.70–2.94; CI 97–98; SI 62–66; OI 17–21.

Color red ferruginous to brown, with lighter appendages. Head and mesosoma finely covered by continuous vermiculate rugae, transverse on anterior portion of pronotum, grading to longitudinal on the rest of promesonotum, mesopleura and lateral faces of propodeum; mandibles with few and short longitudinal striae restricted to basal portion; petiole and postpetiole finely and irregularly rugose. Abundant pilosity on head and dorsum of promesonotum; dorsum of petiolar node and postpetiole with about three and six long hairs, respectively; first tergite of gaster entirely devoid of long flexuous hairs.

Head longer than broad, with vertexal margin convex; frontal lobes slightly rounded laterally; eyes with six to seven facets at greatest diameter. Promesonotum evenly convex in profile; metanotal groove relatively narrow and deeply impressed; propodeal spines straight; teeth of propodeal lobes widen basally, with about half-length of propodeal spines length. Petiolar node strongly elevated and subtriangular in lateral view; dorsum of postpetiole with a raised prominence medially and a well developed anteroventral projection directed anteriorly.

Queen

Feitosa and Brandão (2008) - Differing from worker by having about 12 facets at eyes maximum diameter; dorsum of petiolar node and postpetiole with about five and 10 long hairs, respectively; first tergite of gaster with around 10 long flexuous hairs on the anterior third, near postpetiolar insertion.

Type Material

Feitosa and Brandão (2008) - Holotype worker, Panama: Canal Zone, Barro Colorado Island, iiiii.1994, J. Zetek col., no. 5121/56906 [USNM] (examined).

Etymology

Feitosa and Brandão (2008) - Dr. Marion M. Smith (1944) named this species in honor of Dr. Caryl Parker Haskins (1908– 2001), in recognition for his contribution to the study of ant biology.

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.
  • Smith, M. R. 1944e. The genus Lachnomyrmex, with the description of a second species (Hymenoptera: Formicidae). Proc. Entomol. Soc. Wash. 46: 225-228 (page 227, figs. 1, 2 worker described)