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Strumigenys xenochelyna
| Strumigenys xenochelyna | |
|---|---|
| |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Hymenoptera |
| Family: | Formicidae |
| Subfamily: | Myrmicinae |
| Tribe: | Attini |
| Genus: | Strumigenys |
| Species: | S. xenochelyna |
| Binomial name | |
| Strumigenys xenochelyna (Bolton, 2000)
| |
One of the few specimens of this species was collected at a tree pitfall between 1.5-2m from the ground.
Identification
Bolotn (2000) - A member of the Strumigenys appretiata-group. The Brazilian specimens are more strongly sculptured, with distinct reticulate-punctation on posterior mesonotum, propodeal dorsum and dorsum of petiole node. Also in these the petiole node, though broader than long, is not as strikingly transverse as in the type-series. This species is immediately characterised by its complete lack of a ventral spongiform lobe on the postpetiole, coupled with the presence of short straight hairs at the pronotal humeri and on the first gastral tergite, and its possession of a transversely rectangular petiole node with a concave anterior margin . All other species in the group have at least a vestige of the ventral postpetiolar lobe remaining. In most (Strumigenys deinomastax, Strumigenys glenognatha, Strumigenys halosis, Strumigenys raptans, Strumigenys teratrix, Strumigenys wheeleriana) the lobe is large and conspicuous; in one species (Strumigenys siagodens) it is small, and in two (Strumigenys appretiata, Strumigenys hadrodens) it is reduced to an anteroventral vestige but still discernable.
Keys including this Species
Distribution
Latitudinal Distribution Pattern
Latitudinal Range: -21.41916667° to -22.809943°.
| North Temperate |
North Subtropical |
Tropical | South Subtropical |
South Temperate |
- Source: AntMaps
Distribution based on Regional Taxon Lists
Neotropical Region: Argentina, Brazil, Paraguay (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.
- xenochelyna. Pyramica xenochelyna Bolton, 2000: 165, fig. 125 (w.) PARAGUAY. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 130
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 2.3, HL 0.58, HW 0.54, CI 93, ML 0.10, MI 17, SL 0.21, SI 39, PW 0.28, AL 0.58. Pronotal humeral hair fine, short straight and simple, not flagellate. Mesonotum with a pair of similar hairs. Dorsal surfaces of petiole, postpetiole and first gastral tergite with sparse fine short hairs that are simple and erect. Dorsal alitrunk glossy, with faint vestiges of sculpture; upper half of propodeal declivity finely reticulate-punctate. Dorsum of petiole node feebly sculptured; postpetiole disc glassy smooth. Propodeal spines triangular, very broad basally and tapering rapidly to an acute apex . Petiole in profile with a narrow longitudinal ventral carina (not spongiform) and a tiny lateral lobe that is set posteriorly and very low down on the side. Postpetiole with a lateral spongiform lobe; without any trace of a ventral lobe, the sternite bare. Node of petiole in dorsal view transversely rectangular, nearly two times broader than long, with acute anterolateral angles and a shallowly concave anterior margin; lateral margins straight and feebly convergent posteriorly. Lateral lobes of petiole narrow but prominent, restricted to posterolateral corners. Postpetiole in dorsal view much broader than long, the anterior margin much wider than the posterior so that the sides strongly converge posteriorly. Lateral spongiform lobes of postpetiole extensive and very conspicuous. Basigastral costulae weakly defined and surface of the first gastral tergite with very faint, almost effaced, superficial reticular patterning.
Paratypes. TL 2.0-2.3, HL 0.54-0.60, HW 0.50-0.57, CI 93-95, ML 0.08-0.11, MI 15-18, SL 0.20-0.22, SI 39-40, PW 0.26-0.30, AL 0.50-0.58 (6 measured). Mainly as holotype but in some the promesonotum is almost completely smooth, the feeble sculpture nearly entirely effaced.
Type Material
Holotype worker, Paraguay: Canendiyu, Ype Jhu, 28.x. 1 979, no. 39 (V. Mahnert) (Musee d'Histoire Naturelle Genève). Paratypes. 10 workers with same data as holotype (MHN, 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. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 165, fig. 125 worker described)
References based on Global Ant Biodiversity Informatics
- Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
- Silva T. S. R., and R. M. Feitosa. 2019. Using controlled vocabularies in anatomical terminology: A case study with Strumigenys (Hymenoptera: Formicidae). Arthropod Structure and Development 52: 1-26.
- Silvestre R., M. F. Demetrio, and J. H. C. Delabie. 2012. Community Structure of Leaf-Litter Ants in a Neotropical Dry Forest: A Biogeographic Approach to Explain Betadiversity. Psyche doi:10.1155/2012/306925
- Wild, A. L. "A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)." Zootaxa 1622 (2007): 1-55.