Strumigenys arnoldi-group (Bolton, B. 2000)
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Bolton2000MemoirsoftheAmericanEntomologicalInstitute65, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Bolton2000Memoirs of the American Entomological Institute65">{{Citation See also the citation download page at the journal. |
Ordo: Hymenoptera
Familia: Formicidae
Genus: Strumigenys
Name
Strumigenys arnoldi-group Bolton, B., 2000 – Wikispecies link – Pensoft Profile
- Strumigenys arnoldi-group Bolton, B., 2000, Memoirs of the American Entomological Institute 65: 627-628.
Description
DIAGNOSIS OF WORKER Apical fork of mandible with 2 teeth; always with one long preapical tooth. In some species a second (distal) preapical tooth or denticle is present, between the long (proximal) preapical tooth and the apicodorsal tooth; when present the distal preapical tooth is often weaker on the left mandible than on the right. Mandible in full-face view short (MI 27 - 47), narrow, linear and outcurved in full-face view; the dorsum, proximal of the basalmost tooth, slightly concave. Antenna usually 6 - merous with funicular segments 2 and 3 small and often difficult to discern, but antenna 4 - merous in micrans, schuetzi, lutronHNS, levanaHNS. Leading edge of scape a dorsoventrally flattened convex lamella. Eye very small or vestigial, usually with 4 or less ommatidia. Upper scrobe margins in full-face view widely divergent behind the frontal lobes. Ventrolateral margin of head without trace of a preocular notch, the margin continuous in front of the eye. Ventral surface of head without a preocular transverse groove but postbuccal groove is distinct. Promesonotum flat to slightly convex dorsally and bluntly marginate dorsolaterally. Spongiform appendages of petiole usually well developed into a ventral curtain (narrow strip in abderaHNS); lateral lobes present. Postpetiole with lateral and ventral lobes. Lamella on propodeal declivity usually well developed into a wide strip below the triangular propodeal spines (narrow in charinoHNS, micrans, mold). Pilosity. Pronotal humeral hair absent or present. Apicoscrobal hair absent. Head with curved spatulate to spoon-shaped or orbicular hairs present on dorsum of head behind clypeus at least on anterior half (absent in abderaHNS), anterior clypeal margin, lateral clypeal margin, upper scrobe margin (curved anteriorly) (short, simple appressed hairs in abderaHNS), and leading edge of scape. Dorsum of head without erect hairs or with a transverse row of 4 hairs close to the occipital margin {abderaHNS, alapaHNS, charinoHNS, levanaHNS, lutronHNS, mangaHNS, micrans, mola). Mesonotum without erect hairs, or with one pair on the mesonotum (abderaHNS, alapaHNS, lutronHNS, mangaHNS, micrans, mold) or with two pairs {levanaHNS). Dorsal surface of postpetiole, and gaster with short filiform to narrowly clavate hairs; entire body usually lacking flagellate hairs. Sculpture. Fine dense reticulate-punctate to reticulate-granulate sculpture blankets the entire dorsum of the head; the pronotum reticulate-punctate and occasionally with longitudinal costulae; remainder of the dorsal alitrunk reticulate-punctate (propodeum not reticulate-punctate in mangaHNS); petiole with dense reticulate-punctate sculpture or with faint reticulate-punctate sculpture that is almost effaced. Gaster unsculptured except for basigastral costulae. Glands. Scape gland absent {bathronHNS, charinoHNS, dolabraHNS, lutronHNS, mangaHNS, micrans, mola, schuetzi, tomaHNS) or visible as a elongate patch near apex of ventral scape (abderaHNS, alapaHNS, helianiHNS, levanaHNS). Femoral and tibial gland bullae absent. Gland at base of calcar conspicuous. Tarsal glands absent {alapaHNS, bathronHNS, tomaHNS) or visible on at least first three tarsi of fortarsi, decreasing in size from basitarsus where it is elongate to the third tarsal segment where it is oval. Mesopleural gland visible and set in a circular notch.
Diagnosis
In the Malagasy region members of this group are most similar to species of the emmae-, adsita- and <fem-groups but differ in mandibular dentition and hairs on upper scrobe margin. The apicoscrobal hair is absent (present in emmaeHNS); apical fork of mandible is never composed of 3 spiniform teeth as in adsita-group and mandibles are symmetric, each with either with 3 or 4 teeth (asymmetric in dexis-group). In addition, the arnoldi-, emmae-, and adsita-groups can be distinguished from the dexis-gwup by the following characters: eye always small to minute (usually with 4 or less ommatidia) and the lower scrobe margin rounded, never forming a sharp ridge with ventral surface of head. In the dexis-group the eyes are usually conspicuous, never with 4 or less ommatidia, but if eyes small then the lower scrobe margin forms a sharply marginate ridge with ventral surface of head.
Discussion
The arnoldi-group is also very speciose in the Afrotropical region (see there). The group diagnosis above is somewhat modified from the Afrotropical, to give a best representation of the Malagasy fauna. Within this region members of the group fall into four discrete complexes of related species.
Diagnosis
1 abdera-complex (abderaHNS, bathronHNS, charinoHNS, helianiHNS, mangaHNS, mola). Right and left mandible each with a spiniform proximal preapical tooth and a smaller distal preapical tooth or denticle; distal preapical is weakest on left mandible and may be a minute denticle. Antenna with 6 segments. 2 alapa-complex (alapaHNS, dolabraHNS, tomaHNS). Right and left mandible each with one spiniform preapical tooth, without preapical denticles more distally. Antenna with 6 segments. 3 lutron-complex (levanaHNS, lutronHNS, micrans). Right and left mandible each with a spiniform proximal preapical tooth and a smaller distal preapical tooth or denticle; distal preapical is weakest on the left mandible. Antenna with 4 segments. 4 schuetzi-complex (schuetzi). Right and left mandible each with one spiniform preapical tooth, without preapical denticles more distally. Antenna with 4 segments.
Taxon Treatment
- Bolton, B.; 2000: The ant tribe Dacetini. With a revision of the Strumigenys species of the Malgasy Region by Brian L. Fisher, and a revision of the Austral epopostrumiform genera by Steven O. Shattuck., Memoirs of the American Entomological Institute 65: 627-628. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
