Strumigenys hadrodens

Identification
Bolton (2000) - A member of the Strumigenys appretiata-group. P. hadrodens is recognised within the group by the following combination of characters: ventral spongiform lobe of postpetiole present but vestigial, represented only by a tiny anterior prominence on the sternite; apical half of first gastral tergite superficially reticulate; gaster without flexuous or flagellate hairs; dorsal alitrunk unsculptured; dorsum of petiole node not transversely rectangular, not reticulate-punctate; basigastral costulae obsolete.

Distribution based on Regional Taxon Lists
Neotropical Region: Brazil.

Nomenclature

 *  hadrodens. Pyramica hadrodens Bolton, 2000: 161 (w.) BRAZIL. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 120

Worker
Holotype. TL 2.1, HL 0.62, HW 0.58, CI 94, ML 0.11, MI 18, SL 0.23, SI 40, PW 0.28, AL 0.58. Pronotal humeral hair elongate, fine and flagellate. Mesonotum with a single pair of standing fine hairs. Dorsal surfaces of petiole, postpetiole and gaster with sparse short hairs that are simple, fine and erect. Dorsal alitrunk smooth, unsculptured except for faint vestiges on the propodeum. Declivity of propodeum with vestigial faint sculpture between the spines, but not reticulate-punctate. Dorsum of petiole node and disc of postpetiole unsculptured. Basigastral costulae almost absent, very short and inconspicuous, widely separated and restricted to extreme base of sclerite; not easily observed. Apical half of first gastral tergite with superficial reticular patterning. Propodeal spines elongate and narrowly triangular, much longer than their basal width. In profile the ventral surface of the petiole with a fine longitudinal carina, the lateral spongiform lobe small and very close to the posterior margin. Ventral spongiform lobe of postpetiole vestigial, represented only by a tiny prominence anteriorly on the sternite. Petiole node in dorsal view as long as broad or slightly longer than broad, the lateral spongiform lobe narrowly triangular and restricted to the posterolateral angle. Anterior margin of postpetiole disc twice broader than the posterior margin in dorsal view, the sides convergent posteriorly.

Paratypes. TL 2.0-2.3, HL 0.62-0.64, HW 0.56-0.60, CI 90-94, ML 0.11-0.13, MI 18-20, SL 0.23- 0.26, SI 40-46, PW 0.25-0.30, AL 0.54-0.60 (6 measured). As holotype but the faint sculpture between the propodeal spines may be effaced, leaving the entire declivity smooth. The reticular patterning on the first gastral tergite may also occur on the basal half. Many specimens have an accumulation of very fine silt around the base of the first gastral sternite that may obscure this area unless cleaned.

Type Material
Holotype worker, Brazil: Amazonas, Manaus, Porto Alegre, 25.ii.1994, #25 1 (R. Didham). Paratypes. 2 workers with same data as holotype; 1 worker with same data but #258; 4 workers with same data but 20.ii.1994, #193; 3 workers with same data but 26.ii.1994, #451 (INPA, , ).