Leptogenys montuosa

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Leptogenys montuosa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Leptogenys
Species: L. montuosa
Binomial name
Leptogenys montuosa
Lattke, 2011

Leptogenys montuosa P.jpg

Leptogenys montuosa D.jpg

Specimen Label

Longino reports collecting a nest from beach strand vegetation at Tortuguero in a rotten branch attached to a tree close to ground level. Isopod remains were found within the nest.

Identification

Lattke (2011) - A member of the arcuata species group. Eye convex and large, spanning almost one-third lateral cephalic margin, dorso-laterally situated. Cephalic dorsum punctate, hypostomal tooth visible in cephalic full-face view, scape with suberect hairs, propleuron striate; propodeal dorsum punctate, declivity transversely striate.

Keys including this Species

Distribution

Known from Costa Rica and Panama.

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

The biology of Leptogenys montuosa 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

Queens and males are unknown.

Nomenclature

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

  • montuosa. Leptogenys montuosa Lattke, 2011: 150, fig. 8 (w.) PANAMA.

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

The head sculpture in L. montuosa varies from densely punctate (specimens from Central and NW Costa Rica) to sparsely punctate, and almost smooth posterad, with punctae limited mostly between and anterad of the compound eyes (specimens from Panama and NE Costa Rica). The Guanacaste specimens have more regular striae on the pleura and lateral propodeum than the other specimens. The single La Selva specimen is the largest of all, with rougher sculpturing and a broader head anterad than the other specimens. It was not taken into account for the above description and was labeled as Leptogenys cf. montuosa. The only other arcuata group species possibly sympatric with L. montuosa is Leptogenys donisthorpei and for differences between them the reader should refer to the Comments for L. donisthorpei. Leptogenys arcuata is smaller than L. montuosa with a mostly smooth cephalic dorsum, except for sparse piligerous punctulae; the propodeal dorsum in L. arcuata is mostly smooth, whilst in L. montuosa it has shallow but quite distinct punctures. L. arcuata lacks the presence of appressed pubescence on the cephalic dorsum as in L. montuosa. This species was recognised as JTL-004 (cf. donisthorpei) by Lattke & Longino (2009) in the Ants of Costa Rica website.

Description

Worker

Metrics, holotype (paratypes, n = 4): HL 1.24 (1.11-1.27); HW 1.04 (0.99-1.09); ML 0.89 (0.76-0.91); EL 0.28 (0.25-0.30); SL 1.29 (1.16-1.34); PW 0.81 (0.71-0.83); WL 2.15 (1.80-2.13); PH 0.81 (0.71-0.81); PL 0.61 (0.53-0.66); DPW 0.56 (0.48-0.58) mm. CI 0.84 (0.86-0.89); MI 0.85 (0.77-0.84); OI 0.27 (0.26-0.28); SI 1.24 (1.17-1.23); LPI 1.33 (1.23-1.33); DPI 0.92 (0.88-0.92).

Head sub-rectangular in full-face view, longer than wide; lateral margins broadly curved and diverging anterad; posterior margin convex, slightly flattened medially. Eye convex and large, spanning almost one-third lateral cephalic margin. Cephalic dorsum ranging from densely punctate to sparsely punctate posterad with punctae limited to between and anterad compound eyes; fine longitudinal striae present between eye and clypeus. Scape with abundant piligerous punctae, surpassing posterior cephalic margin by more than one-fourth its length; length of antennal segments III and IV more than 2 x their respective widths. Anterior clypeal margin laterally sinusoid, medially straight to slightly convex, median process about as long as wide, margins opaque to weakly translucent, apex with 4 – 3 setae. Mandible slightly arched, parallel-sided with brief and weakly concave edentate masticatory margin, basal angle usually with denticle; mandible leaves gap between clypeus when closed, at widest more than twice the mandibular width. Scape has abundant subdecumbent hairs and decumbent pilosity. Hypostomal tooth visible in cephalic full-face view.

Mesosoma with prominent metanotal groove dividing dorsal margin in two large convexities in lateral view: promesonotum, and metanotum-propodeum. Pronotum mostly smooth and shining with some transverse rugulae on pronotal collar, and scattered punctae; propleuron striate. Mesometapleural suture well impressed. Mesopleuron varies from mostly smooth and shining with transverse striae along ventral area to mostly striate with smoother dorsomedian area; metapleural-propodeal suture well impressed. Mesonotum oval in dorsal view, smooth and shining; metanotal groove scrobiculate. Metapleuron and propodeal side rugulose, propodeal dorsum with scattered shallow punctae, declivity transversely striate; spiracle opening directed posterolaterally.

Node with anterior and posterior margins joined by convexity in lateral view; anterior margin shorter than posterior margin, dorsal margin meets posterior margin in abrupt angle; posterior margin weakly convex. Node laterally rugose; posterior face flattened, smooth and shining, distinctly separated from rest of node. Node as wide as long in dorsal view, widest posterad. Gaster smooth and shining with sparse punctulae. Head, mesosoma and abdomen black; clypeus, mandibles, antennae, and legs dark brown.

Type Material

Holotype worker. Costa Rica, Limón, Tortuguero, < 100 m, 10°35′N 83°31′W, 1. – 5.vii.1985, J. Longino 386. Deposited in the Los Angeles County Museum of Natural History. The same pin bears two point-mounted workers, with the top worker designated as holotype. – Paratypes. Three workers with the same locality data as the holotype. One worker is on the same pin as the holotype and the two are on a single pin. All deposited in the LACM.

Etymology

The species name alludes to the name of Cerro Montuoso in Panama, a locality from which L. montuosa has been recorded.

References