Polyrhachis gressitti
Polyrhachis gressitti | |
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Scientific classification | |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Hymenoptera |
Family: | Formicidae |
Subfamily: | Formicinae |
Tribe: | Camponotini |
Genus: | Polyrhachis |
Subgenus: | Aulacomyrma |
Species: | P. gressitti |
Binomial name | |
Polyrhachis gressitti Kohout, 2007 |
Known only from the holotype worker. Nothing is known about the biology of Polyrhachis gressitti.
Identification
Kohout (2007) - Another remarkable species very similar to P. decora, but with a distinctly longer and exceptionally high propodeum with its outline forming an almost perfect semicircle in dorsal view.
Keys including this Species
Distribution
Distribution based on Regional Taxon Lists
Indo-Australian Region: New Guinea (type locality).
Distribution based on AntMaps
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. |
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. |
Biology
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Castes
Known only from the worker caste.
Images from AntWeb
Worker. Specimen code casent0009243. Photographer April Nobile, uploaded by California Academy of Sciences. | Owned by MCZ, Cambridge, MA, USA. |
Nomenclature
The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.
- gressitti. Polyrhachis (Aulacomyrma) gressitti Kohout, 2007a: 223, figs. 66, 69, 72 (w.) NEW GUINEA.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Description
Worker
Holotype: TL c. 4.23; HL 1.15; HW 0.90; CI 78; SL 1.25; SI 139; PW 0.78; MTL 1.25.
Anterior clypeal margin with minute notch medially; clypeus in profile virtually straight with weakly impressed basal margin. Frontal triangle indistinct. Frontal carinae sinuate, with rather short, laminate, anteriorly truncate lobes. Sides of head in front of eyes converging anteriorly; rounding behind eyes into convex preoccipital margin. Eyes strongly convex, protuberant, in full face view clearly breaking lateral cephalic outline. Mesosoma laterally and posteriorly immarginate, distinctly antero-posteriorly compressed, notably when viewed from side. Pronotal humeri armed with rather strong, horizontal, anteriorly directed spines; pronotal dorsum evenly curved in profile. Promesonotal suture strongly impressed; metanotal groove lacking. Mesonotal-propodeal dorsum distinctly wider than long; propodeal declivity exceptionally high. Petiole with dorsal margin acute, sinuate in dorsal view, lateral spines relatively short, curved backwards. Anterior face of first gastral segment convex.
Mandibles finely longitudinally striate. Sculpture of head and mesosoma consisting of regularly spaced, smooth and glossy striae; mostly longitudinal and somewhat anteriorly converging on head, transverse and anteriorly bowed on pronotum; striae on mesonotal-propodeal dorsum forming imperfect semicircular pattern with outmost striae continuing obliquely onto sides and posteriorly extending into propodeal declivity. Petiole with both faces transversely striate, striae less distinct dorsally, becoming wrinkles just below dorsal margin. First gastral segment distinctly longitudinally striate, dorsum with striae finer and distinctly converging towards base.
Mostly medium length, erect or curved, golden hairs on dorsum of head, mesosoma and gaster; distinctly shorter hairs along leading edge of antennal scapes, dorsal margin of petiole and legs. Appressed pubescence virtually absent from most body surfaces, except dorsum of first gastral segment, where it is rather diluted and reddish.
Black; mandibular masticatory border, antennal scapes, most of femora, basal segment of tarsi and apical segments of gaster reddish brown to dark rusty red. Funiculi, trochanters, proximal ends of femora and apical tarsal segments, light to very light reddish brown.
Type Material
HOLOTYPE: PAPUA NEW GUINEA: Adelbert Mts, Wanuma, 04º36’S, 145º06’E, 800-1000m, 25.x.1958, J. L. Gressitt (worker). Type deposition: unique holotype in Museum of Comparative Zoology.
Etymology
Named in honor of the collector, the late J. L. Gressit, Bernice P. Bishop Museum, Honolulu, Hawai’i.
References
References based on Global Ant Biodiversity Informatics
- Janda M., G. D. Alpert, M. L. Borowiec, E. P. Economo, P. Klimes, E. Sarnat, and S. O. Shattuck. 2011. Cheklist of ants described and recorded from New Guinea and associated islands. Available on http://www.newguineants.org/. Accessed on 24th Feb. 2011.
- Kohout R.J. 2007. Revision of the subgenus Aulacomyrma Emery of the genus Polyrhachis F. Smith, with descriptions of new species (pp. 186-253). In Snelling, R.R., Fisher, B.L. & Ward, P.S. (eds). Advances in ant systematics: homage to E.O. Wilson 50 years of contributions. Memoirs of the American Entomological Institute 80: 690 pp.
- Robson Simon Database Polyrhachis -05 Sept 2014