Leptogenys erugata

Every Ant Tells a Story - And Scientists Explain Their Stories Here
Jump to navigation Jump to search
Leptogenys erugata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Leptogenys
Species: L. erugata
Binomial name
Leptogenys erugata
Lattke, 2011

Leptogenys erugata P.jpg

Leptogenys erugata D.jpg

Specimen Label

Lattke (2011) - Nests have been found in humid forested sites, including shade cocoa plantations, at ground level in rotting wood such as branches or logs. They are found from almost sea level to 1200 m above sea level. Specimens have also been taken in leaf litter samples. Reaction upon disturbance to the nest is to run and hide in surrounding litter.

Identification

Lattke (2011) - Eye laterally placed, relatively flattened, separated from mandibular insertion by one diameter; mandible mostly parallel-sided but slightly widening apicad, dorsum smooth and shining, sparsely punctate; cephalic dorsum mostly smooth and shining with sparse piligerous punctulae. Scape smooth with abundant piligerous punctulae, surpasses posterior cephalic border by less than one-third its length.

A member of the quiriguana species group. This species can be confused with the Central American species Leptogenys quiriguana, which has distinct triangular denticles on the propodeum in contrast to the unarmed propodeum of L. erugata. Examined samples of L. erugata from Colombia differ from the Venezuelan samples in a scape with pilosity of uniform length, slightly more punctae on the cephalic dorsum, and the promesonotal margin more flattened in lateral view. L. erugata from Falcón, Venezuela (both localities in the humid Serranía de San Luis) have the propodeal spiracle rounded and laterally placed on the mesosoma, but other populations tend to have the spiracle oval and facing posterolaterally, with the cuticle posterad of the spiracle indented.

Keys including this Species

Distribution

Known from northern Colombia and northern Venezuela.

Distribution based on Regional Taxon Lists

Neotropical Region: Colombia, Venezuela (type locality).


Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

Biology

The biology of Leptogenys erugata is poorly known.

The Leptogenys genus page has more details about the general biology of ants in this genus, some of which is summarized in what follows. New World species have relatively small ranges, generally occur in humid forests and prey on isopods. Colonies may occur in high densities on a local scale, with up to 5 or 6 species present. Nest size tends to be small with just 20 or 30 individuals in a mature colony. Nests of most species may be found in rotten wood on the ground, usually within cavities in logs or large branches, and also beneath bark. Wood-soil and rock-soil interfaces are another common nesting location, as well as rock crevices, and a few species may nest directly in the soil. Reproduction is most commonly via ergatoid females and, in many species, may include egg-laying workers.

Castes

Male unknown.

Nomenclature

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

  • erugata. Leptogenys erugata Lattke, 2011: 202, fig. 58 (w.q.) VENEZUELA.

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

Description

Worker

Metrics, holotype (other specimens, n = 4): HL 1.11 (1.06 – 1.16); HW 0.78 (0.76 – 0.83); ML 0.58 (0.56 – 0.61); EL 0.15 (0.15–0.15); SL 0.99 (0.94–1.01); PW 0.63 (0.63 – 0.68); WL 1.67 (1.57 – 1.72); PH 0.71 (0.63 – 0.73); PL 0.58 (0.56–0.61); DPW 0.51 (0.48–0.51) mm. CI 0.70 (0.69 – 0.72); MI 0.74 (0.71 – 0.73); OI 0.19 (0.18 – 0.20); SI 1.26 (1.21 – 1.26); LPI 1.22 (1.14 – 1.22); DPI 0.87 (0.83–0.91).

Head subrectangular in full-face view; wider anterad than posterad; both posterior and lateral margins broadly convex, almost straight; vertexal carinae narrow, but visible throughout most of posterior cephalic margin; eye laterally placed, relatively flattened, diameter less than one-fourth lateral cephalic margin, separated from mandibular insertion by one diameter; anterior clypeal margin with broadly triangular median lobe, apex bluntly pointed; lateral clypeal lobe narrow; clypeus laterally smooth, medially with longitudinal strigae. Scape smooth with abundant piligerous punctulae, surpassing posterior cephalic border by less than one-third its length; second and third antennal segments approximately same length; fourth antennal segment shorter, more than half the length of segment three. Mandible shuts tight against clypeus, elongate, mostly parallel-sided but slightly widening apicad; mandibular dorsum smooth and shining, sparsely punctate; cephalic dorsum mostly smooth and shining with sparse piligerous punctulae. PF: 4,3.

Mesosoma with two very broad convexities in lateral view; promesonotum forms continuous convexity, posterior one-fourth of mesonotum drops abruptly into promesonotal suture; dorsal propodeal margin weakly convex, almost straight; dorsal propodeal margin almost 2 × length of declivitous margin. Mesosoma mostly smooth and shining; mesonotum wider than long. Cervix with transverse striae; mesonotum wider than long in dorsal view; prosternal process with posterior minute denticle in lateral view. Mesometapleural suture well impressed, scrobiculate; metapleural propodeal suture wanting; propodeal spiracle small, rounded to oval, laterally to posterolaterally facing; mesopleuron with anterior crest, widening anterad close to pronotum; propodeum unarmed.

Petiole subquadrate in lateral view; dorsal margin convex, highest posterad; posterior margin straight to very broadly convex; triangular ventral tooth present; anterior margin slightly less than half as long as posterior margin in dorsal view; node and gaster smooth and shining. Node subquadrate in dorsal view; anterior margin convex, more than half as wide as posterior margin, posterior margin straight medially to convex laterally; procoxa smooth and shining in lateral view; stridulitrum present. Pygidium with or without brief longitudinal crest. Head, thorax, and most of abdomen dark brown to almost black; antenna and mandible brown; legs and apical gastral segments ferruginous brown. Body with sparse short standing hairs, no appressed pilosity; scape with abundant decumbent pilosity and hairs.

Queen

Lighter colored than worker, mostly ferruginous brown; dorsal propodeal margin more convex in lateral view; node compressed in lateral and dorsal views.

Type Material

Holotype worker. Venezuela, Falcón, 2 km ESE Curimagua, 11°10′N 69°35′W, 1150 m, 19.vii.1993, J. Lattke 1513. One worker deposited in Instituto de Zoologia Agricola. – Paratypes. From the same nest as the holotype: 1w Museum of Comparative Zoology, 1w The Natural History Museum, 1w 1q MIZA.

Etymology

The species name alludes to the smooth integument of this species. It is derived from the Latin, erugatus, for smooth.

References