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Strumigenys weberi
| Strumigenys weberi | |
|---|---|
| |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Hymenoptera |
| Family: | Formicidae |
| Subfamily: | Myrmicinae |
| Tribe: | Attini |
| Genus: | Strumigenys |
| Species: | S. weberi |
| Binomial name | |
| Strumigenys weberi (Brown, 1959) | |
One of the few collections of this species was made from a rainforest litter sample.
Identification
A member of the Strumigenys weberi-group.
Bolton (1983) - Known only from the holotype weberi is one of three species in the group which combine an unsculptured postpetiolar disc and an impressed metanotal groove. The other species showing these two characters together are Strumigenys kerasma and Strumigenys mekaha; weberi can be separated from these two species as follows:
| kerasma and mekaha | weberi |
| Median indentation of posterior spongiform appendage of postpetiole shallow, not approaching the margin of the disc. | Median indentation of posterior spongiform appendage of postpetiole reaching the margin of the disc. |
| Spongiform material bordering margin of postpetiole posteriorly as wide from front to back as the disc of the postpetiole is long. | Spongiform material bordering margin of postpetiole posteriorly distinctly narrower from front to back than the disc of the postpetiole is long. |
| Propodeal teeth long, the infradental lamella vestigial and its free margin evenly concave. | Propodeal teeth short and broad, the infradental lamella conspicuous and its free margin straight or feebly sinuate, not evenly concave. |
| All hairs on dorsum of head of same construction and approximate size, not divided into appressed small ground-pilosity and much larger erect subclavate hairs. | Hairs on dorsum of head of two forms, divided into small appressed ground-pilosity and much larger erect subclavate hairs. |
| Larger species, HL 0.68-0.70 HW 0.44-0.47. | Smaller species, HL 0.61, HW 0.39. |
| Second tooth of principal mandibular row the longest, the first (basalmost) and third about equal in length. | Second tooth of principal mandibular row the longest but the first (basalmost) very much smaller than the third. |
Keys including this Species
Distribution
Distribution based on Regional Taxon Lists
Afrotropical Region: Democratic Republic of Congo (type locality), Uganda.
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. |
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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
Nomenclature
The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.
- weberi. Smithistruma weberi Brown, 1959c: 7, fig. 4 (w.) DEMOCRATIC REPUBLIC OF CONGO. Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 130. See also: Bolton, 1983: 311. See also: Bolton, 2000: 341.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Description
Worker
TL 2.3, HL 0.61, HW 0.39, CI 64, ML 0.07, MI 11, SL 0.28, SI 72, PW 0.28, AL 0.58.
Basal lamella of mandible a high truncated rectangle with concave sides. Basalmost tooth on mandible small, separated from the basal lamella by a small diastema. Second tooth from base the longest, the third about twice longer than the basalmost. The three teeth of the principal row following the second (longest) tooth are about the same size and are followed distally by 2 smaller teeth, 4 minute denticles and a small apical tooth. Anterior clypeal margin more or less transverse, only very feebly sinuate. Lateral clypeal margins irregular, feebly convergent anteriorly and with rounded anterolateral corners. With the head in full-face view the lateral clypeal margins with a few anteriorly curved simple short hairs and with a number of anterolaterally or laterally projecting stout long hairs which are upcurved in their apical halves and feebly clavate apically. Such hairs also present on clypeal dorsum where they curve posteromedially, and on the sides of the head where they curve upwards and forwards. Dorsum of head behind clypeus with small simple anteriorly curved hairs which are closely applied to the surface and with longer stout hairs similar in shape and size to those on the clypeus, the longer subclavate hairs feebly curved anteriorly or anteromedially. Cephalic dorsum strongly densely reticulate-rugulose. Antennal scape weakly bent in its basal third, broadest at about the midlength and having the leading edge equipped with freely projecting curved hairs which also occur on its dorsal surface. Maximum diameter of eye 0.18 X HW. Pronotum not marginate laterally and without a median longitudinal ridge or carina dorsally. With the alitrunk in profile the metanotal groove distinctly impressed. Propodeal teeth very small and triangular, subtended by a conspicuous infradental lamella whose free posterior margin is almost straight, not evenly concave as is usual in this group. Dorsal surfaces of pronotum, mesonotum, petiole, postpetiole and gaster with numerous simple fine hairs which may be subflagellate, looped or arched, without large subclavate hairs similar to those on the head. Sides of pro no tum and propodeum rugulose, the mesopleuron finely punctate and the metapleuron almost smooth. Dorsum of pronotum and mesonotum densely reticulate-rugulose, the propodeal dorsum densely punctate and the declivity smooth. Petiole dorsum irregularly rugulose; postpetiolar disc smooth. First gastral tergite with sharply defined but short basal costulae. Spongiform appendages of pedicel segments strongly developed in profile. In dorsal view the petiole node with a broad posterior spongiform strip whose free margin is shallowly concave medially. Disc of postpetiole surrounded by spongiform material, the strip bordering the posterior margin broadest posterolaterally, narrowing medially and sharply indented at the midpoint, the indentation reaching the margin of the disc itself. Base of first gastral tergite with a broad band of spongiform material from which the basigastral costulae emerge. Colour medium brown.
Type Material
Holotype worker, ZAIRE: Ango, ii.-iii.1948, no 2170 (N. A. Weber) (Museum of Comparative Zoology) [examined].
References
- Baroni Urbani, C. & De Andrade, M.L. 2007. The ant tribe Dacetini: limits and constituent genera, with descriptions of new species. Annali del Museo Civico di Storia Naturale “G. Doria” 99: 1-191.
- Bolton, B. 1983. The Afrotropical dacetine ants (Formicidae). Bulletin of the British Museum (Natural History). Entomology. 46:267-416. (page 311, redescription of worker)
- Bolton, B. 1999. Ant genera of the tribe Dacetonini (Hymenoptera: Formicidae). J. Nat. Hist. 3 33: 1639-1689 (page 1673, combination in Pyramica)
- Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 341, redescription of worker)
- Brown, W. L., Jr. 1959c. Some new species of dacetine ants. Breviora 108: 1-11. (page 7, fig. 4 worker described)
References based on Global Ant Biodiversity Informatics
- Brown W. L., Jr. 1959. Some new species of dacetine ants. Breviora 108: 1-11.