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Strumigenys gatuda
| Strumigenys gatuda | |
|---|---|
| |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Hymenoptera |
| Family: | Formicidae |
| Subfamily: | Myrmicinae |
| Tribe: | Attini |
| Genus: | Strumigenys |
| Species: | S. gatuda |
| Binomial name | |
| Strumigenys gatuda (Bolton, 1983)
| |
Nothing is known about the biology of Strumigenys gatuda.
Identification
Bolton (2000) - A member of the truncatidens complex in the Strumigenys emarginata group. Characters of truncatidens-complex. Dorsal surfaces of pronotum, mesonotum, propodeum (including declivity), petiole node and postpetiole disc all smooth and very shiny; promesonotum with widely scattered small punctures but dorsal alitrunk entirely lacking reticulate-punctate sculpture. Dorsum of head behind highest point of vertex with numerous standing hairs. Eye relatively small, maximum diameter ca 0.09 X HW.
Bolton (1983) - A very distinctive species of the emarginata-group, gatuda is characterized by its distribution of simple pilosity, reduced alitrunk sculpture and glassy smooth body.
Keys including this Species
Distribution
Distribution based on Regional Taxon Lists
Afrotropical Region: Rwanda (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. |
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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.
- gatuda. Smithistruma gatuda Bolton, 1983: 292, fig. 11 (w.) RWANDA. Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 120. See also: Bolton, 2000: 303.
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 2·2, HL 0.59, HW 0.42, CI 71, ML 0.06, MI 10, SL 0.28, SI 67, PW 0.27, AL 0.60.
Mandibles with 5 relatively large teeth followed distally by two slightly smaller teeth and a series of 4 denticles before the apical tooth. Basal lamella of mandible concealed by clypeus and not visible. Anterior clypeal margin broadly and shallowly concave between the broadly rounded anterolateral angles, the margin equipped with 6 spatulate to spoon-shaped broad hairs which are strongly curved towards the midline and arranged in three pairs; the innermost pair so strongly curved together that the apices are almost touching, the outermost pair intermediate in size to the very large spoon-shaped hair at the anterolateral clypeal corner. Lateral clypeal margins shallowly convex and very feebly convergent anteriorly, equipped with a fringe of anteriorly curved large spatulate to spoon-shaped hairs. Clypeal and cephalic dorsa with a ground-pilosity of small spoon-shaped curved hairs. Sides of occipital lobes in full-face view with freely projecting long feebly clavate hairs. With head in profile the dorsum from the highest point of the vertex back to the occipital margin with a number of long erect to suberect anteriorly curved hairs which are feebly clavate to weakly remiform. Preocular laminae in full-face view weakly divergent anteriorly but reaching a maximum width before meeting the clypeus, and from there to the clypeus slightly convergent. Antennal scapes narrow basally, bent at about the basal third and broadest at about this point, the leading edge subangulate at the point of maximum width and with a series of freely projecting spatulate hairs. Flagellate hairs absent. Clypeus, area between frontal lobes and a short median strip behind that smooth and unsculptured. Remainder of head densely punctate to reticulate-punctate, the punctures and spaces between them glossy. Head in profile with vertex moderately high and narrowly rounded, the ventral surface behind the level of the eye broadly and evenly convex. Maximum diameter of eye distinctly less than maximum width of scape. Pronotum with lateral margins bluntly narrowly rounded but not marginate, the dorsum without a median longitudinal ridge or carina and the humeri lacking flagellate hairs. Anterior portion of mesonotum raised up to level of pronotal dorsum, the remainder of the mesonotum and the propodeal dorsum markedly depressed. Highest point of raised anterior portion of mesonotum with a pair of long erect stout hairs which constitute the only standing pilosity on the dorsal alitrunk. Metanotal groove absent, the mesonotal and propodeal dorsa forming a single surface. Propodeal teeth long and narrow, slightly upcurved, the infradental lamellae narrow. Alitrunk dorsum with scattered minute appressed hairs and the long mesonotal pair mentioned above. Petiole with one pair oflong straight simple hairs, postpetiole with 3-4 pairs. Gastral tergites with numerous straight hairs which are simple to feebly clavate, erect to suberect. Dorsal alitrunk glassy smooth, highly polished with widely separated small punctures. Petiole and the voluminous postpetiole glassy smooth dorsally, the first gastral tergite unsculptured except for the basigastral costulae. Pleurae of alitrunk smooth except for a patch of evenly spaced punctures occupying the central third or slightly more of the mesopleuron. Extreme base of first gastral sternite with sparse but sharply incised punctures. Spongiform appendages of pedicel segments strongly developed in profile. In dorsal view the posterior margin of the petiole node with a transverse strip which is broad and spongiform postrolaterally but which is very narrow and lamellar centrally. The concave anterior margin of the postpetiole with a narrow translucent lamellar strip, the posterior margin with a transverse strip which is broad laterally but contracted down to a narrow isthmus medially. Transverse basal strip of first gastral tergite lamellar rather than spongiform and traversed by the raised basigastral costulae. Colour light glossy brown.
Paratypes. TL 2.2-2.3, HL 0.58-0.60, HW 0.41-0.42, CI 70-71, ML 0.06, MI 10, SL 0.26-0.28, SI 63-67, PW 0.26-0.28, AL 0.60-0.62 (5 measured). As holotype.
Type Material
Holotype worker, Rwanda: Rangiro, 10.vii.1973, 1800m (P. Werner) (Musee d'Histoire Naturelle Genève). Paratypes. 4 workers with same data as holotype; 1 worker with same data but 6.viii.1973 (MHNG; The Natural History Museum; Museum of Comparative Zoology).
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 292, fig. 11 worker described)
- 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 303, redescription of worker)
- Nsengimana, V., Hagenimana, T., Barakagwira, J., de Dieu Nsenganeza, J., Iradukunda, S. C., Majyambere, M., Kizungu, O. B., Nkundimana, A., Umutoni, D., Fabrice, R., Cyubahiro, B., Kouakou, L. M., Kolo, Y., Anale, J. S., Gómez, K., Dekoninck, W. 2023. Checklist of ant (Hymenoptera: Formicidae) species from Nyungwe Tropical Rain Forest, south-western Rwanda. Journal of East African Natural History 111(2), 69-81 (doi:10.2982/028.111.0203).
References based on Global Ant Biodiversity Informatics
- Bolton B. 1983. The Afrotropical dacetine ants (Formicidae). Bulletin of the British Museum (Natural History). Entomology 46: 267-416.
- Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65