Acanthostichus longinodis

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Acanthostichus longinodis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dorylinae
Genus: Acanthostichus
Species: A. longinodis
Binomial name
Acanthostichus longinodis
Mackay, W.P., 2004

The type series, the only known specimens, were collected from under a stone.

Identification

Mackay (2004) - This initially appears to be a typical South American Acanthostichus species, but can be distinguished from other South American species by the combination of the elongate petiole (Fig. 4), the small subpetiolar process (Fig. 1) and the incrassate posterior femur (Fig. 3). It can be separated from two Mexican species with elongate petioles, Acanthostichus quirozi and Acanthostichus skwarrae Wheeler as the sides of the petiole are sharply separated from the dorsal surface by an abrupt bend which nearly forms a carina. The elongate petiole would preclude confusion with any other species in the genus.

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Paraguay (type locality).

Check distribution from AntMaps.

Distribution based on specimens

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The above specimen data are provided by AntWeb. Please see Acanthostichus longinodis for further details

Biology

Castes

Nomenclature

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

  • longinodis. Acanthostichus longinodis Mackay, W.P., 2004: 97, figs. 1 – 4, 10 (w.) PARAGUAY.

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

Description

Worker

Mackay 2004. Figures 1-9.

(n = 3, all measurements in mm): HL (Head Length) 0.76-0.78, HW (Head Width) 0.58-0.60, SL (Scape Length) 0.28-0.30, SW (maximum Scape Width) 0.10-0.11, EL (maximum Eye Length) 0.04-0.05, WL (Weber's Length, anterior edge of pronotal shoulder to posterior edge of metapleurallobe) 1.08-1.14, PL (Petiole Length) 0.35-0.40, PW (Petiole Width) 0.23-0.26, SI (Scape index, SL/HL X 100) 35-40, Cl (Cephalic Index, HW/HL X 100) 76-77, PI (Petiolar Index, PL/PW X 100) 150-153, SL/SW 2.78-2.88.

Mandible without teeth; anterior border of clypeus weakly concave, nearly straight; frontal carinae closely spaced, slightly overhanging anterior margin of clypeus with head in full face view (Fig. 2); sides of head nearly straight, slightly widened anteriorly (Fig. 2), posterior border of head slightly concave; scape short; eye tiny, apparently composed of three ommatidia; malar groove well marked; mesosoma basically rectangular in shape as seen from side and as seen from above, narrowed posteriorly (seen from above), with narrowest part being posterior edge of propodeum; propodeal spiracle slightly below midline (Fig. 1); petiole greatly elongated (Fig. 4), anterior face nearly straight, slightly widened posteriorly; posterior femur incrassate (Fig. 3).

Moderately hairy, with erect hairs on scape, mandible, dorsal surface of head, posterior border of head, ventral surface of head, dorsum of mesosoma, dorsum of petiole, and all surfaces of gaster.

All surfaces smooth and glossy.

Ferrugineous red, appendages and gaster slightly lighter.

Type Material

Type series.-Holotype worker (Museo Nacional de Historia Natural del Paraguay, Museo Nacional de Historia Natural del Paraguay), 2 paratype workers (William and Emma Mackay, William and Emma Mackay collection; Museum of Comparative Zoology, Museum of Comparative Zoology, Harvard University), PARAGUAY: Dpto. Chaco: Parque Nacional Defensores del Chaco: Cerro Leon: zona pelada: Sitio #11; 9-15-viii-1983, Colr. J. A. Kochalka.

Etymology

From Latin, longus for long and nodus for swelling, describing the elongate petiole.

References