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Strumigenys monoropa group
Strumigenys monoropa group Bolton (2000)
Species
Malesian-Oriental-East Palaeartic
Worker Diagnosis
Apical fork of mandible of 2 spiniform teeth; certainly 1 intercalary denticle present, may be two (not clearly visible in single specimen known). Mandibles short (MI 37), outer margins shallowly convex; mandible broadest just proximal of preapical tooth, the latter conical and slightly recurved, close to apicodorsal tooth. In ventral view outer margin of mandible without an inflected prebasal angle. Anterior clypeal margin transverse or nearly so, not broadly concave, without a narrow U-shaped or V-shaped median notch or impression; anterior portion of clypeal dorsum shallowly transversely concave.
Scape stoutly subcylindrical, short, SI 64.
Apical antennomere broad basally, broadly articulated with the preapical.
Ventrolateral margin of head without a preocular notch or impression. With head in profile the dorsal and ventral outlines without impressions except for the shallow postbuccal groove.
Propodeal declivity with an extremely narrow and inconspicuous lamella, the posterior (free) margin of which is concave and closely parallels the shape of the margin of the declivity.
Spongiform appendages of waist segments present. Ventral curtain of petiole very shallow.
In profile lateral spongiform lobe of petiole node posterior, small and triangular; posterior collar of petiole vestigial, not spongiform.
Pilosity. Apicoscrobal hair absent. Cephalic dorsum with moderately dense simple ground pilosity that is long, soft and conspicuously curved; a single pair of short hairs present near occipital margin, only slightly longer and more erect than the ground pilosity; dorsum otherwise without standing hairs. Pronotal humeral hair slender and simple, almost straight; pronotal dorsum otherwise lacking standing hairs. Mesonotum without standing hairs. Ground-pilosity on promesonotum long and fine, conspicuous. Dorsal (outer) surfaces of middle and hind tibiae and basitarsi with curved hairs only, without long erect filiform or flagellate hairs. First gastral tergite with short stiff simple erect hairs, sparse but present on all of sclerite.
Sculpture. Head, alitrunk and petiole densely reticulate-punctate everywhere, without smooth patches on pleurae. Disc of postpetiole coarsely reticulate-punctulate. Gaster unsculptured except for short basigastral costulae, which are distinctly shorter than length of postpetiole disc.
Notes
The single stocky, densely sculptured and darkly coloured little species included here does not fit easily into any other group. Strumigenys monoropa seems most closely related to the yaleopleura-group but its pilosity is strikingly different and its mandibles, broadest near the preapical tooth, are unlike those of the yaleopleura group which are broadest basally. The shape of the inner mandibular margin close to its apex is reminiscent of the koningsbergeri group but those species have markedly concave clypeal margins and very different pilosity.
References
- Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028.