Acropyga ambigua

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Acropyga ambigua
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Plagiolepidini
Genus: Acropyga
Species: A. ambigua
Binomial name
Acropyga ambigua
Emery, 1922

Acropyga ambigua casent0249914 p 1 high.jpg

Acropyga ambigua casent0249914 d 1 high.jpg

Specimen Labels

Evolutionary Relationships
Acropyga



Acropyga ayanganna




Acropyga donisthorpei



Acropyga panamensis







Acropyga guianensis



Acropyga stenotes






Acropyga fuhrmanni



Acropyga smithii





Acropyga romeo




Acropyga hirsutula




Acropyga dubitata




Acropyga decedens, Acropyga goeldii



Acropyga epedana












Acropyga arnoldi



Acropyga silvestrii






Acropyga kinomurai



Acropyga lauta





Acropyga sauteri




Acropyga acutiventris




Acropyga myops




Acropyga butteli




Acropyga ambigua



Acropyga pallida










Based on Blaimer et al., 2016. Note only selected Acropyga species are included, and undescribed species are excluded.

LaPolla (2004) - Collected in rainforest from leaf litter and soil cores. It has been reported as being trophophoretic and been associated with 3 mealybug species: Eumyrmococcus kusiacus, E. neoguineensis, Xenococcus acropygae (Williams, 1998).

Identification

LaPolla (2004) - Worker: 9-11 segmented antennae; basal tooth separated from other teeth by a distinct diastema; basal tooth margin distinct and not smoothly continuous with inner mandibular margin, slightly below inner mandibular margin. Queen: as in worker with modifications expected for caste. Male: unknown. Compare with Acropyga pallida.

Workers of this species can be difficult to distinguish from Acropyga pallida, especially if a specimen is on the lower end for head width measurements. Examination reveals morphometric differences between the two species. Typically A. ambigua head width is greater than 0.45 mm, while A. pallida is less than 0.45 mm, although exceptions occur. Smaller individuals of A. ambigua are difficult to distinguish because the mandible, which is distinct in larger individuals can become similar to the A. pallida mandible type, that is in lacking a distinct diastema associated with the basal tooth. Another problem arises in that A. pallida specimens can form diastemas between the 4th and basal tooth as a result of dental abrasion. When this occurs and the head width is below 0.45 mm the specimens are nearly impossible to separate between the two species, though plotting head width against head length can be helpful.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Indonesia, Malaysia, New Guinea (type locality).

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Check specimen data from AntWeb

Biology

Castes

Males are not known for this species.

Worker

Nomenclature

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

  • ambigua. Acropyga (Atopodon) ambigua Emery, 1922d: 107, fig. 1 (w.q.) NEW GUINEA. See also: LaPolla, 2004a: 60.

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

Description

Worker

Acropyga ambigua Emery 1922.jpg

LaPolla (2004) - (n=17): TL: 1.52-1.96; HW: 0.402-0.518; HL: 0.395-0.571; SL: 0.281-0.413; ML: 0.402-0.516; GL: 0.656-0.93; CI: 88.71-101.07; SI: 68.37-84.63.

Head: yellow; head covered in layer of appressed hairs, with occasional scattered suberect to erect hairs, especially along posterior margin; head longer than broad, though occasionally as long as broad; posterior margin entire; 9-11 segmented, incrassate antennae; scape reaches or slightly fails (approximately less than half length of pedicel) to reach posterior margin; clypeus broad, slightly convex medially; clypeus with appressed to erect hairs; mandible broad, with 5-6 teeth; basal tooth separated from other teeth by a distinct diastema in which a small tooth occasionally develops (making mandible 6-toothed); 4th tooth (from apical) often separated from 3rd tooth by a short diastema, in which a small tooth occasionally develops (making mandible 6 toothed); basal tooth margin not smoothy continuous with inner mandibular margin; anterior clypeal margin and inner mandibular margin nearly parallel. Mesosoma: yellow; in lateral view, pronotum rises steeply toward mesonotum; pronotum with short appressed to suberect hairs throughout, longer erect hairs on posteriorly; mesonotum often rounded, slightly higher than propodeum; dorsum covered in layer of short appressed hairs with suberect to erect hairs throughout and of variable lengths; metanotal area distinct; propodeal dorsum with short appressed to suberect hairs; declivity steep. Gaster: petiole thick and erect, apex reaches height of propodeal spriac1e; gaster yellow; covered in thick layer of appressed hairs with scattered erect hairs throughout.

Queen

LaPolla (2004) - (n=1): TL: 3.13; HW: 0.668; HL: 0.651; SL: 0.489; ML: 0.912; GL: 0.912; CI: 102.61; SI: 73.2. As in worker with modifications expected for caste and the following differences: color dark brown throughout; head broader than long.

Type Material

LaPolla (2004) - Acropyga (Atopodon) ambigua Emery, 1922: 107 (w.q.). 2 syntype workers, 1 syntype queen, PAPUA NEW GUINEA: N.E.: Friedrich-Wilhelmshaften (L. Birö) (probably in Hungarian Natural History Museum) [not examined).

References

  • Emery, C. 1922e. Quelques fourmis nouvelles minuscules. Ann. Hist.-Nat. Mus. Natl. Hung. 19: 107-112 (page 107, fig. 1 worker, queen described)
  • LaPolla, J.S. 2004a. Acropyga of the world. Contributions of the American Entomological Institute. 33(3):1-130. PDF (page 60, worker described, subgeneus removed)
  • Williams, D J . 1998. Mealybugs o f the genera Eumyrmococcus Silvestri and Xenococcus Silvestri associated with the ant genus Acropyga Roger and a review of the subfamily (Hemiptera, Coccoidea, Pseudoccidae). Bulletin of the British Museum (Natural History)(Entomology) 67: 1 -64.