Pseudomyrmex fasciatus

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Pseudomyrmex fasciatus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Pseudomyrmecinae
Genus: Pseudomyrmex
Species group: elongatulus
Species: P. fasciatus
Binomial name
Pseudomyrmex fasciatus
Ward & Branstetter, 2022

Pseudomyrmex fasciatus occurs from Chiapas, Mexico to Costa Rica. Recorded habitats include montane rainforest edge, montane wet forest, montane moist forest, and second-growth forest edge, at elevations ranging from 750 m to 1,600 m (mean 1,115 m; n = 28). Nests have been collected in dead twigs of various woody plants, including vines and orchids. Two series of specimens intercepted in quarantine at San Francisco, from Guatemala, are labeled ‘ex Oncidium wentworthianum’ and ‘ex Epidendrum atropurpurium’, respectively. A third interception, at Hoboken, New Jersey was from an Oncidium stem.

Identification

Small to medium-sized species (HW 0.84–0.94) with moderately elongate head (CI 0.79–0.86) (Fig. 15) and relatively large eyes (REL 0.45–0.48); frontal carinae separated by less than basal scape width; metanotal groove weakly impressed, in profile barely discernable; dorsal face of propodeum flat, rounding into declivitous face, and the two subequal in length; petiole relatively slender (PLI 0.46–0.58, PL/HL 0.54–0.60); in profile, anterodorsal face of petiole flat to convex, ascending gradually to summit in posterior half of node, then rounding into more steeply descending posterior face; profemur generally slender (FI 0.41–0.47); hind leg relatively short (LHT/HL 0.67-0.76). Head subopaque to sublucid, densely punctulate-coriarious, the punctulae on vertex separated by less than their diameters. Standing pilosity sparse, absent from propodeum and mesonotum (MSC 2–5). Light yellow- to orange-brown, with dark brown anterolateral patches on abdominal tergite 4 (first gastric tergite), sometimes joined medially, and conspicuous transverse bands on abdominal tergites 5 and 6 (gastric tergites 2 and 3); distal half of metafemur weakly (and variably) infuscated.

Among species in the P. elongatulus group that are predominantly yellow-orange to light orange-brown in color, this species can be recognized by the combination of relatively large eyes (worker REL 0.45–0.48, queen REL 0.45–0.46), moderately elongate head (worker CI 0.79–0.86, queen CI 0.72–0.76), weakly developed metanotal groove in the worker, and conspicuous transverse maculation on abdominal tergites 4–6 (gastric tergites 1–3). Our phylogenomic data reveal that Pseudomyrmex fasciatus is sister to Pseudomyrmex cognatus (including its phylogenetically embedded inquiline, Pseudomyrmex comitator) (Fig. 1). Pseudomyrmex fasciatus and P. cognatus are broadly sympatric and quite different in appearance, with workers and queens of P. cognatus being brown to brownish-black in color.

Keys including this Species

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 16° to 9°.

 
North
Temperate
North
Subtropical
Tropical South
Subtropical
South
Temperate
  • Source: Ward & Branstetter, 2022

Distribution based on Regional Taxon Lists

Neotropical Region: El Salvador, Costa Rica (type locality), Guatemala, Honduras, Mexico, Nicaragua.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.
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Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.
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Biology

Castes

Phylogeny

Relationships among Pseudomyrmex elongatulus group species based on Ward & Branstetter (2022).

Pseudomyrmex

Pseudomyrmex salvini

some Pseudomyrmex championi

some Pseudomyrmex championi

Pseudomyrmex apache

Pseudomyrmex fasciatus

some Pseudomyrmex cognatus

some Pseudomyrmex cognatus

Pseudomyrmex comitator

some Pseudomyrmex arcanus

some Pseudomyrmex arcanus

Pseudomyrmex capillatus

Pseudomyrmex veracruzensis

Pseudomyrmex nimbus

Pseudomyrmex exoratus

Pseudomyrmex ereptor

Pseudomyrmex elongatulus

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • fasciatus. Pseudomyrmex fasciatus Ward & Branstetter, 2022: 24, figs. 15, 20 (w.dq.) COSTA RICA.

Type Material

  • Holotype Worker. COSTA RICA Puntarenas: 2 km SSE Monteverde, 1,230 m, 10.28906 −84.80304 ± 3 m, 5 Jan 2018, ex dead twig of vine, montane rainforest edge, P. S. Ward PSW18011 (MUCR) (CASENT0863540).
  • Paratypes: series of workers, 1 dealate queen, same data as holotype (CASC, JTLC, LACM, MCZC, PSWC, UCDC, UNAM, USNM).

Description

References