Polyrhachis noonananti

AntWiki: The Ants --- Online
Polyrhachis noonananti
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Polyrhachis
Subgenus: Myrma
Species group: aculeata
Species complex: aculeata
Species: P. noonananti
Binomial name
Polyrhachis noonananti
Kohout, 2013

The type specimens were collected from fogging samples in lowland rainforest.

Identification

A member of the Polyrhachis aculeata species group in the subgenus Myrma

Polyrhachis noonannanti is very similar to other species of the aculeata-complex (e.g. Polyrhachis cybele and Polyrhachis hemiopticoides); however, it is easily separable by the unique structure of the front of the head (i.e. a short median carina running from the frontal triangle to the central area between the anteriorly flat frontal carinae), the presence of a shallow posterior depression in the profile of the mesosoma and the greatly reduced petiolar spines.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Oriental Region: Thailand (type locality).

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

Sexuals and immature stages unknown.

Nomenclature

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

  • noonananti. Polyrhachis (Myrma) noonananti Kohout, 2013: 150, figs. 12, 17-18 (w.) THAILAND.

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

Description

Description. Worker. Dimensions (holotype): TL c. 5.74; HL 1.43; HW 1.22; CI 85; SL 1.87; SI 153; PW 0.97; MTL 1.93.

Anterior clypeal margin arcuate, widely medially truncate. Clypeus with median carina blunt anteriorly, weakly raised towards almost flat basal margin; straight in profile. Frontal triangle distinct; short median carina running for short distance from triangle towards central area. Frontal carinae closely approximate and rather flat anteriorly, distinctly raised and sinuate from midlength with central area relatively wide posteriorly. Sides of head in front of eyes converging towards mandibular bases in weakly convex line; behind eyes sides widely rounding into occipital margin. Eyes convex, only moderately posteriorly truncate. Ocelli lacking. Dorsum of mesosoma convex longitudinally and transversely, with rather poorly developed lateral margins and in profile with a very shallow depression indicating position of metanotal groove. Pronotal spines relatively short, about 1.5x longer than their basal width; lateral margins of pronotal dorsum subparallel, gently rounding into weakly impressed promesonotal suture. Mesonotal dorsum with lateral margins flat, weakly converging posteriorly; metanotal groove only weakly impressed dorsally. Propodeal dorsum with lateral margins converging posteriorly and terminating in narrowly rounded, weakly raised ridges that continue medially and merge into a dorsally bowed carina dividing propodeal dorsum from shallowly concave declivity; secondary carinae extending from propodeal margins towards propodeal spiracles, dividing declivity from sides of propodeum. Petiole biconvex in profile, armed with a pair of very short, acute spines situated on dorsolateral angles of petiole; rather blunt, secondary tooth situated laterally at base of each spine. Anterior face of first gastral segment in unique holotype is damaged beyond recognition of its shape or height (Figs 17, 18).

Mandibles finely, longitudinally striate with numerous piliferous pits. All dorsal body surfaces very smooth and highly polished. Sides of mesosoma very finely wrinkled.

Mandibles along masticatory borders and near bases with a few semierect, relatively short, golden hairs. Anterior clypeal margin with a few moderately long, anteriorly directed, golden setae medially. A few pairs of moderately long, erect, golden hairs on clypeus and along frontal carinae. Hairs totally absent from dorsum of mesosoma, petiole, dorsum of first gastral segment, femora and tibiae. Only a few short hairs along superior edge of antennal scapes; longer hairs on anterior and posterior faces of fore coxae. Gaster with numerous, posteriorly directed hairs around apex and on gastral venter.

Colour. Body black; mandibular teeth, antennae, tarsi and venter of gaster very dark reddish brown. Trochanters, femora and tibiae, except joints, distinctly light reddish brown.

Sexuals and immature stages unknown.

Etymology. Named after Dr Nawee Noon-anant of Prince of Songkla University, Hat Yai, Thailand, in appreciation of his support during my visit to southern Thailand and for making the Polyrhachis material in his collection available for examination.

Type Material

  • Holotype, worker, Surat Thani Prov., Klong Sang WS, Chiew Larn reservoir, Thailand, iii-v.1994, L. Lebel, QMT 183498, Queensland Museum; lowland rainforest, fogging.

Etymology

Named after Dr Nawee Noon-anant of Prince of Songkla University, Hat Yai, Thailand, in appreciation of his support during my visit to southern Thailand and for making the Polyrhachis material in his collection available for examination.

References